Обсуждение: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
2 kingston V+100 500GB Soft RAID1 (md) ioscheduler [noop] ext3 Linux pro-cdn1 2.6.26-2-amd64 #1 SMP Tue Jan 25 05:59:43 UTC 2011 x86_64 GNU/Linux Filesystem Size Used Avail Use% Mounted on /dev/md4 452G 301G 128G 71% /home/ssd -------- Random 8KB read/write with 1% write ./pgiosim -w1 -a1 -v -b 1000000 /home/ssd/big.1 Write Mode: 1% Stallcheck at 1.000000 Verbose Unknown units of blocks Arg: 1 Read 1000000 blocks Added /home/ssd/big.1 ------- 3.20%, 32036 read, 300 written, 25625.08kB/sec 3203.14 iops 5.33%, 21283 read, 198 written, 17026.31kB/sec 2128.29 iops 7.47%, 21356 read, 245 written, 17084.73kB/sec 2135.59 iops 9.62%, 21511 read, 234 written, 17208.72kB/sec 2151.09 iops 11.78%, 21591 read, 216 written, 17271.71kB/sec 2158.96 iops 14.08%, 23032 read, 245 written, 18425.52kB/sec 2303.19 iops 16.53%, 24527 read, 228 written, 19621.52kB/sec 2452.69 iops 18.89%, 23535 read, 225 written, 18827.91kB/sec 2353.49 iops 21.19%, 23003 read, 229 written, 18402.34kB/sec 2300.29 iops 23.40%, 22139 read, 211 written, 17711.13kB/sec 2213.89 iops 25.66%, 22628 read, 225 written, 18102.33kB/sec 2262.79 iops 27.86%, 21983 read, 238 written, 17586.32kB/sec 2198.29 iops 30.14%, 22823 read, 211 written, 18258.31kB/sec 2282.29 iops 32.44%, 22975 read, 240 written, 18379.92kB/sec 2297.49 iops 34.83%, 23870 read, 214 written, 19095.92kB/sec 2386.99 iops 37.24%, 24129 read, 213 written, 19303.10kB/sec 2412.89 iops 39.49%, 22450 read, 210 written, 17959.92kB/sec 2244.99 iops 41.77%, 22827 read, 235 written, 18261.53kB/sec 2282.69 iops 43.98%, 22138 read, 218 written, 17710.30kB/sec 2213.79 iops 46.31%, 23293 read, 241 written, 18634.30kB/sec 2329.29 iops 48.86%, 25422 read, 258 written, 20337.52kB/sec 2542.19 iops 51.06%, 22091 read, 222 written, 17672.72kB/sec 2209.09 iops 53.46%, 23970 read, 215 written, 19175.93kB/sec 2396.99 iops 55.80%, 23359 read, 224 written, 18687.12kB/sec 2335.89 iops 58.04%, 22472 read, 232 written, 17977.24kB/sec 2247.16 iops 60.34%, 22981 read, 230 written, 18384.72kB/sec 2298.09 iops 62.17%, 18228 read, 192 written, 14580.33kB/sec 1822.54 iops 64.60%, 24336 read, 229 written, 19465.85kB/sec 2433.23 iops 66.89%, 22912 read, 210 written, 18329.52kB/sec 2291.19 iops 69.06%, 21677 read, 231 written, 17341.54kB/sec 2167.69 iops 71.28%, 22255 read, 210 written, 17803.91kB/sec 2225.49 iops 73.68%, 23928 read, 243 written, 19142.30kB/sec 2392.79 iops 75.90%, 22255 read, 205 written, 17803.93kB/sec 2225.49 iops 78.17%, 22641 read, 233 written, 18112.72kB/sec 2264.09 iops 80.50%, 23328 read, 235 written, 18662.29kB/sec 2332.79 iops 82.84%, 23379 read, 230 written, 18703.11kB/sec 2337.89 iops 84.90%, 20670 read, 236 written, 16535.95kB/sec 2066.99 iops 86.91%, 20018 read, 222 written, 16012.14kB/sec 2001.52 iops 89.24%, 23321 read, 235 written, 18654.39kB/sec 2331.80 iops 91.56%, 23224 read, 227 written, 18579.13kB/sec 2322.39 iops 94.05%, 24880 read, 262 written, 19903.93kB/sec 2487.99 iops 96.40%, 23549 read, 205 written, 18839.14kB/sec 2354.89 iops 98.80%, 23956 read, 230 written, 19164.73kB/sec 2395.59 iops ------ ./pgiosim -w10 -a1 -v -b 1000000 /home/ssd/big.1 Write Mode: 10% Stallcheck at 1.000000 Verbose Unknown units of blocks Arg: 1 Read 1000000 blocks Added /home/ssd/big.1 1.62%, 16226 read, 1642 written, 12979.00kB/sec 1622.37 iops 1.67%, 433 read, 38 written, 346.40kB/sec 43.30 iops 2.95%, 12839 read, 1282 written, 10271.06kB/sec 1283.88 iops 2.95%, 3 read, 0 written, 2.40kB/sec 0.30 iops 3.50%, 5500 read, 548 written, 4399.83kB/sec 549.98 iops 4.95%, 14524 read, 1468 written, 11619.12kB/sec 1452.39 iops 4.95%, 3 read, 1 written, 2.40kB/sec 0.30 iops 4.95%, 8 read, 0 written, 6.40kB/sec 0.80 iops 6.20%, 12471 read, 1241 written, 9976.67kB/sec 1247.08 iops 6.20%, 3 read, 0 written, 2.40kB/sec 0.30 iops 7.63%, 14272 read, 1445 written, 11417.26kB/sec 1427.16 iops 7.63%, 3 read, 0 written, 2.40kB/sec 0.30 iops 7.65%, 263 read, 22 written, 210.40kB/sec 26.30 iops 8.65%, 9930 read, 990 written, 7943.83kB/sec 992.98 iops 8.67%, 268 read, 24 written, 214.40kB/sec 26.80 iops 9.30%, 6296 read, 621 written, 5036.78kB/sec 629.60 iops 9.83%, 5233 read, 541 written, 4186.35kB/sec 523.29 iops 10.75%, 9222 read, 960 written, 7377.56kB/sec 922.20 iops 10.80%, 506 read, 52 written, 404.80kB/sec 50.60 iops 11.74%, 9417 read, 933 written, 7533.53kB/sec 941.69 iops 11.77%, 314 read, 29 written, 251.20kB/sec 31.40 iops 12.56%, 7906 read, 793 written, 6324.78kB/sec 790.60 iops 13.37%, 8052 read, 830 written, 6441.52kB/sec 805.19 iops 13.40%, 309 read, 29 written, 247.20kB/sec 30.90 iops 14.01%, 6116 read, 635 written, 4892.73kB/sec 611.59 iops 14.71%, 6994 read, 675 written, 5595.18kB/sec 699.40 iops 15.83%, 11205 read, 1188 written, 8953.19kB/sec 1119.15 iops 15.90%, 651 read, 68 written, 520.80kB/sec 65.10 iops 16.33%, 4355 read, 490 written, 3480.77kB/sec 435.10 iops 17.14%, 8098 read, 777 written, 6478.33kB/sec 809.79 iops 17.14%, 6 read, 0 written, 4.80kB/sec 0.60 iops 18.70%, 15603 read, 1622 written, 12482.33kB/sec 1560.29 iops 18.70%, 4 read, 0 written, 3.20kB/sec 0.40 iops 18.71%, 34 read, 5 written, 27.20kB/sec 3.40 iops 19.29%, 5829 read, 595 written, 4663.08kB/sec 582.89 iops 20.81%, 15209 read, 1477 written, 12167.16kB/sec 1520.90 iops 20.81%, 3 read, 0 written, 2.40kB/sec 0.30 iops 20.82%, 61 read, 8 written, 48.80kB/sec 6.10 iops 21.98%, 11665 read, 1144 written, 9331.42kB/sec 1166.43 iops 21.98%, 2 read, 0 written, 1.60kB/sec 0.20 iops 22.78%, 7988 read, 817 written, 6389.86kB/sec 798.73 iops 23.12%, 3364 read, 346 written, 2690.97kB/sec 336.37 iops 23.49%, 3746 read, 357 written, 2996.69kB/sec 374.59 iops 24.67%, 11720 read, 1137 written, 9375.97kB/sec 1172.00 iops 24.67%, 4 read, 0 written, 3.20kB/sec 0.40 iops 25.50%, 8365 read, 808 written, 6691.96kB/sec 836.49 iops 25.69%, 1865 read, 190 written, 1491.33kB/sec 186.42 iops 26.14%, 4462 read, 424 written, 3569.58kB/sec 446.20 iops 27.07%, 9377 read, 928 written, 7494.42kB/sec 936.80 iops 27.58%, 5103 read, 532 written, 4082.37kB/sec 510.30 iops 28.54%, 9537 read, 918 written, 7619.92kB/sec 952.49 iops 28.70%, 1600 read, 151 written, 1279.99kB/sec 160.00 iops 29.99%, 12901 read, 1247 written, 10307.61kB/sec 1288.45 iops 30.12%, 1339 read, 139 written, 1071.19kB/sec 133.90 iops 30.16%, 421 read, 41 written, 336.75kB/sec 42.09 iops 30.60%, 4368 read, 486 written, 3494.38kB/sec 436.80 iops 32.16%, 15580 read, 1585 written, 12463.80kB/sec 1557.97 iops 32.16%, 2 read, 0 written, 1.60kB/sec 0.20 iops 32.19%, 330 read, 21 written, 263.97kB/sec 33.00 iops 32.92%, 7302 read, 748 written, 5841.50kB/sec 730.19 iops 33.95%, 10339 read, 1030 written, 8269.88kB/sec 1033.74 iops 33.96%, 4 read, 0 written, 3.20kB/sec 0.40 iops 34.32%, 3673 read, 374 written, 2938.35kB/sec 367.29 iops 35.66%, 13395 read, 1335 written, 10715.92kB/sec 1339.49 iops 35.66%, 9 read, 3 written, 7.20kB/sec 0.90 iops 36.05%, 3890 read, 389 written, 3111.96kB/sec 388.99 iops 37.19%, 11383 read, 1104 written, 9097.74kB/sec 1137.22 iops 37.19%, 2 read, 0 written, 1.60kB/sec 0.20 iops 38.62%, 14295 read, 1511 written, 11421.06kB/sec 1427.63 iops 38.62%, 6 read, 0 written, 4.80kB/sec 0.60 iops 38.62%, 2 read, 0 written, 1.60kB/sec 0.20 iops 39.20%, 5831 read, 579 written, 4664.78kB/sec 583.10 iops 40.25%, 10453 read, 1006 written, 8355.83kB/sec 1044.48 iops 40.25%, 2 read, 0 written, 1.60kB/sec 0.20 iops 41.72%, 14710 read, 1501 written, 11767.59kB/sec 1470.95 iops 41.72%, 4 read, 0 written, 3.20kB/sec 0.40 iops 41.72%, 2 read, 0 written, 1.60kB/sec 0.20 iops 42.87%, 11472 read, 1144 written, 9177.50kB/sec 1147.19 iops 42.87%, 5 read, 0 written, 4.00kB/sec 0.50 iops 44.08%, 12076 read, 1233 written, 9660.75kB/sec 1207.59 iops 44.08%, 4 read, 1 written, 3.20kB/sec 0.40 iops 44.45%, 3684 read, 364 written, 2947.17kB/sec 368.40 iops 45.71%, 12684 read, 1339 written, 10147.10kB/sec 1268.39 iops 45.71%, 4 read, 0 written, 3.20kB/sec 0.40 iops 46.00%, 2823 read, 284 written, 2256.73kB/sec 282.09 iops 46.41%, 4116 read, 423 written, 3292.78kB/sec 411.60 iops 47.54%, 11360 read, 1121 written, 9087.86kB/sec 1135.98 iops 47.59%, 451 read, 52 written, 360.75kB/sec 45.09 iops 48.25%, 6646 read, 680 written, 5316.07kB/sec 664.51 iops 49.53%, 12717 read, 1281 written, 10173.34kB/sec 1271.67 iops 49.53%, 4 read, 0 written, 3.20kB/sec 0.40 iops 49.84%, 3107 read, 311 written, 2484.65kB/sec 310.58 iops 50.81%, 9737 read, 961 written, 7789.56kB/sec 973.69 iops 50.81%, 4 read, 1 written, 3.20kB/sec 0.40 iops 51.69%, 8811 read, 934 written, 7047.89kB/sec 880.99 iops 51.82%, 1281 read, 129 written, 1024.53kB/sec 128.07 iops 52.89%, 10674 read, 1034 written, 8539.07kB/sec 1067.38 iops 52.89%, 14 read, 3 written, 11.20kB/sec 1.40 iops 53.41%, 5235 read, 532 written, 4187.99kB/sec 523.50 iops 54.08%, 6711 read, 679 written, 5368.75kB/sec 671.09 iops 54.94%, 8535 read, 878 written, 6827.91kB/sec 853.49 iops 54.94%, 4 read, 0 written, 3.20kB/sec 0.40 iops 55.65%, 7086 read, 682 written, 5668.57kB/sec 708.57 iops 57.23%, 15799 read, 1561 written, 12639.04kB/sec 1579.88 iops 57.23%, 2 read, 0 written, 1.60kB/sec 0.20 iops 57.23%, 4 read, 0 written, 3.20kB/sec 0.40 iops 57.83%, 6043 read, 615 written, 4833.90kB/sec 604.24 iops 59.43%, 16034 read, 1657 written, 12827.16kB/sec 1603.39 iops 59.43%, 5 read, 0 written, 4.00kB/sec 0.50 iops 59.44%, 8 read, 1 written, 6.40kB/sec 0.80 iops 60.81%, 13705 read, 1397 written, 10963.65kB/sec 1370.46 iops 60.81%, 4 read, 0 written, 3.20kB/sec 0.40 iops 60.84%, 377 read, 30 written, 301.55kB/sec 37.69 iops 61.58%, 7402 read, 760 written, 5921.57kB/sec 740.20 iops 62.26%, 6764 read, 679 written, 5411.12kB/sec 676.39 iops 63.18%, 9188 read, 870 written, 7346.94kB/sec 918.37 iops 63.77%, 5951 read, 554 written, 4760.63kB/sec 595.08 iops 63.77%, 5 read, 0 written, 4.00kB/sec 0.50 iops 64.71%, 9386 read, 973 written, 7508.68kB/sec 938.59 iops 64.71%, 4 read, 0 written, 3.20kB/sec 0.40 iops 65.87%, 11559 read, 1142 written, 9246.80kB/sec 1155.85 iops 65.91%, 406 read, 41 written, 324.79kB/sec 40.60 iops 67.53%, 16184 read, 1634 written, 12929.73kB/sec 1616.22 iops 67.53%, 3 read, 0 written, 2.40kB/sec 0.30 iops 67.53%, 3 read, 0 written, 2.40kB/sec 0.30 iops 68.66%, 11289 read, 1124 written, 9031.13kB/sec 1128.89 iops 68.66%, 3 read, 0 written, 2.40kB/sec 0.30 iops 70.12%, 14665 read, 1482 written, 11731.93kB/sec 1466.49 iops 70.13%, 6 read, 1 written, 4.80kB/sec 0.60 iops 70.17%, 489 read, 53 written, 391.20kB/sec 48.90 iops 70.61%, 4311 read, 438 written, 3448.77kB/sec 431.10 iops 72.32%, 17185 read, 1741 written, 13747.94kB/sec 1718.49 iops 72.32%, 4 read, 0 written, 3.20kB/sec 0.40 iops 72.32%, 1 read, 0 written, 0.80kB/sec 0.10 iops 72.97%, 6433 read, 653 written, 5141.42kB/sec 642.68 iops 73.55%, 5830 read, 584 written, 4663.93kB/sec 582.99 iops 74.72%, 11705 read, 1188 written, 9355.64kB/sec 1169.45 iops 74.72%, 1 read, 0 written, 0.80kB/sec 0.10 iops 75.18%, 4561 read, 388 written, 3643.86kB/sec 455.48 iops 75.50%, 3230 read, 292 written, 2583.90kB/sec 322.99 iops 76.88%, 13816 read, 1427 written, 11052.76kB/sec 1381.60 iops 76.88%, 3 read, 1 written, 2.40kB/sec 0.30 iops 77.86%, 9736 read, 1007 written, 7788.77kB/sec 973.60 iops 78.00%, 1424 read, 138 written, 1139.19kB/sec 142.40 iops 78.67%, 6737 read, 675 written, 5389.53kB/sec 673.69 iops 79.50%, 8296 read, 816 written, 6636.43kB/sec 829.55 iops 79.50%, 3 read, 0 written, 2.40kB/sec 0.30 iops 80.44%, 9361 read, 924 written, 7488.75kB/sec 936.09 iops 80.44%, 3 read, 0 written, 2.40kB/sec 0.30 iops 81.66%, 12259 read, 1217 written, 9807.12kB/sec 1225.89 iops 81.66%, 3 read, 1 written, 2.40kB/sec 0.30 iops 82.72%, 10554 read, 1106 written, 8441.93kB/sec 1055.24 iops 82.95%, 2329 read, 224 written, 1863.19kB/sec 232.90 iops 82.99%, 408 read, 39 written, 326.40kB/sec 40.80 iops 84.07%, 10723 read, 1090 written, 8578.37kB/sec 1072.30 iops 84.07%, 4 read, 0 written, 3.20kB/sec 0.40 iops 85.10%, 10379 read, 1028 written, 8303.15kB/sec 1037.89 iops 85.12%, 167 read, 14 written, 133.59kB/sec 16.70 iops 86.31%, 11925 read, 1117 written, 9539.95kB/sec 1192.49 iops 86.31%, 4 read, 1 written, 3.20kB/sec 0.40 iops 86.66%, 3452 read, 352 written, 2761.42kB/sec 345.18 iops 87.77%, 11113 read, 1088 written, 8890.26kB/sec 1111.28 iops 87.77%, 3 read, 1 written, 2.40kB/sec 0.30 iops 88.91%, 11434 read, 1081 written, 9147.12kB/sec 1143.39 iops 88.91%, 5 read, 0 written, 4.00kB/sec 0.50 iops 89.75%, 8341 read, 802 written, 6672.71kB/sec 834.09 iops 90.23%, 4835 read, 491 written, 3867.94kB/sec 483.49 iops 91.12%, 8910 read, 941 written, 7127.93kB/sec 890.99 iops 91.12%, 3 read, 0 written, 2.40kB/sec 0.30 iops 91.71%, 5909 read, 567 written, 4726.76kB/sec 590.85 iops 92.15%, 4316 read, 415 written, 3452.78kB/sec 431.60 iops 93.44%, 12960 read, 1299 written, 10367.83kB/sec 1295.98 iops 93.44%, 4 read, 0 written, 3.20kB/sec 0.40 iops 93.73%, 2857 read, 292 written, 2285.59kB/sec 285.70 iops 95.35%, 16170 read, 1658 written, 12935.95kB/sec 1616.99 iops 95.35%, 3 read, 0 written, 2.40kB/sec 0.30 iops 95.35%, 5 read, 0 written, 4.00kB/sec 0.50 iops 96.65%, 13060 read, 1274 written, 10447.89kB/sec 1305.99 iops 96.65%, 5 read, 0 written, 4.00kB/sec 0.50 iops 97.46%, 8065 read, 853 written, 6451.07kB/sec 806.38 iops 97.57%, 1158 read, 120 written, 926.40kB/sec 115.80 iops 98.70%, 11221 read, 1113 written, 8975.70kB/sec 1121.96 iops 98.70%, 42 read, 4 written, 33.60kB/sec 4.20 iops 99.85%, 11480 read, 1170 written, 9180.01kB/sec 1147.50 iops 99.85%, 2 read, 0 written, 1.60kB/sec 0.20 iops -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
Sorry, it's not 2x512GB in Raid1 but 4x256GB in raid10 -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
On 04/19/2011 05:15 AM, Laurent Laborde wrote: > 2 kingston V+100 500GB > Thanks for the performance report. The V+100 is based on a Toshiba T6UG1XBG controller, and it doesn't have any durable cache from either a battery or capacitor. As such, putting a database on that drive is very risky. You can expect the database to be corrupted during an unusual power outage event. See http://wiki.postgresql.org/wiki/Reliable_Writes for more information. At this point most people considering one of Kingston's drives for a database would be better off getting an Intel 320 series drive, which is around the same price but doesn't have this issue. -- Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us "PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
On Tue, Apr 19, 2011 at 2:07 PM, Greg Smith <greg@2ndquadrant.com> wrote: > On 04/19/2011 05:15 AM, Laurent Laborde wrote: >> >> 2 kingston V+100 500GB 4x250GB in Raid10 (see my 2nd post) > Thanks for the performance report. The V+100 is based on a Toshiba T6UG1XBG > controller, and it doesn't have any durable cache from either a battery or > capacitor. As such, putting a database on that drive is very risky. You > can expect the database to be corrupted during an unusual power outage > event. See http://wiki.postgresql.org/wiki/Reliable_Writes for more > information. > > At this point most people considering one of Kingston's drives for a > database would be better off getting an Intel 320 series drive, which is > around the same price but doesn't have this issue. If we use them (unlikely), recovery in case of power outage isn't a problem, as we will use it on slave database (using Slony-I) that can be created/destroyed at will. And, anyway, our slave have fsync=off so the battery won't change anything in case of power outage :) i am currently testing on a single V+100 250GB (without raid). Report will follow soon :) -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
1 SSD Kingston V+100 250GB, no raid. /home/pgiosim-0.5/pgiosim -w1 -a1 -v -b 1000000 /home/ssd/big1 Write Mode: 1% Stallcheck at 1.000000 Verbose Unknown units of blocks Arg: 1 Read 1000000 blocks Added /home/ssd/big1 3.57%, 35720 read, 365 written, 28567.73kB/sec 3570.97 iops 6.14%, 25684 read, 276 written, 20519.77kB/sec 2564.97 iops 8.17%, 20270 read, 219 written, 16215.94kB/sec 2026.99 iops 9.66%, 14937 read, 131 written, 11945.84kB/sec 1493.23 iops 12.91%, 32494 read, 327 written, 25995.08kB/sec 3249.38 iops 14.06%, 11508 read, 118 written, 9206.33kB/sec 1150.79 iops 16.09%, 20292 read, 187 written, 16233.55kB/sec 2029.19 iops 17.57%, 14817 read, 141 written, 11853.49kB/sec 1481.69 iops 19.62%, 20515 read, 201 written, 16411.94kB/sec 2051.49 iops 21.90%, 22794 read, 214 written, 18222.39kB/sec 2277.80 iops 23.92%, 20207 read, 197 written, 16160.23kB/sec 2020.03 iops 26.11%, 21812 read, 213 written, 17427.32kB/sec 2178.42 iops 28.29%, 21852 read, 213 written, 17475.40kB/sec 2184.43 iops 30.73%, 24416 read, 234 written, 19507.42kB/sec 2438.43 iops 32.46%, 17298 read, 183 written, 13833.15kB/sec 1729.14 iops 33.25%, 7863 read, 87 written, 6290.35kB/sec 786.29 iops 35.67%, 24229 read, 213 written, 19383.12kB/sec 2422.89 iops 37.71%, 20397 read, 208 written, 16317.50kB/sec 2039.69 iops 39.61%, 19022 read, 200 written, 15217.51kB/sec 1902.19 iops 41.63%, 20190 read, 202 written, 16151.85kB/sec 2018.98 iops 44.00%, 23651 read, 266 written, 18913.60kB/sec 2364.20 iops 45.30%, 13066 read, 112 written, 10452.69kB/sec 1306.59 iops 47.37%, 20697 read, 218 written, 16557.55kB/sec 2069.69 iops 49.75%, 23726 read, 217 written, 18980.50kB/sec 2372.56 iops 51.55%, 18087 read, 170 written, 14469.56kB/sec 1808.69 iops 53.47%, 19194 read, 193 written, 15355.08kB/sec 1919.39 iops 55.30%, 18250 read, 205 written, 14599.93kB/sec 1824.99 iops 57.00%, 16999 read, 160 written, 13599.09kB/sec 1699.89 iops 58.79%, 17912 read, 180 written, 14329.56kB/sec 1791.19 iops 61.76%, 29694 read, 318 written, 23753.91kB/sec 2969.24 iops 62.96%, 12039 read, 113 written, 9631.16kB/sec 1203.90 iops 65.67%, 27048 read, 273 written, 21609.48kB/sec 2701.18 iops 67.00%, 13305 read, 130 written, 10639.63kB/sec 1329.95 iops 69.22%, 22229 read, 227 written, 17783.07kB/sec 2222.88 iops 71.13%, 19062 read, 170 written, 15249.52kB/sec 1906.19 iops 72.06%, 9299 read, 97 written, 7437.79kB/sec 929.72 iops 74.31%, 22492 read, 202 written, 17986.09kB/sec 2248.26 iops 76.66%, 23493 read, 219 written, 18768.77kB/sec 2346.10 iops 78.75%, 20979 read, 209 written, 16775.76kB/sec 2096.97 iops 80.68%, 19305 read, 194 written, 15428.97kB/sec 1928.62 iops 83.05%, 23670 read, 222 written, 18927.19kB/sec 2365.90 iops 84.59%, 15391 read, 169 written, 12299.46kB/sec 1537.43 iops 86.32%, 17246 read, 166 written, 13796.73kB/sec 1724.59 iops 88.33%, 20133 read, 201 written, 16106.22kB/sec 2013.28 iops 89.98%, 16561 read, 172 written, 13248.30kB/sec 1656.04 iops 92.81%, 28298 read, 252 written, 22627.87kB/sec 2828.48 iops 94.85%, 20388 read, 198 written, 16308.57kB/sec 2038.57 iops 96.75%, 18974 read, 178 written, 15179.09kB/sec 1897.39 iops 98.45%, 16956 read, 190 written, 13564.73kB/sec 1695.59 iops ------------- /home/pgiosim-0.5/pgiosim -w10 -a1 -v -b 1000000 /home/ssd/big1 Write Mode: 10% Stallcheck at 1.000000 Verbose Unknown units of blocks Arg: 1 Read 1000000 blocks Added /home/ssd/big1 2.01%, 20122 read, 1978 written, 16097.57kB/sec 2012.20 iops 2.01%, 3 read, 0 written, 2.40kB/sec 0.30 iops 2.01%, 3 read, 0 written, 2.40kB/sec 0.30 iops 2.01%, 3 read, 0 written, 2.40kB/sec 0.30 iops 3.82%, 18036 read, 1779 written, 14428.73kB/sec 1803.59 iops 4.03%, 2175 read, 209 written, 1739.98kB/sec 217.50 iops 4.03%, 3 read, 0 written, 2.40kB/sec 0.30 iops 4.03%, 2 read, 0 written, 1.60kB/sec 0.20 iops 4.04%, 4 read, 0 written, 3.20kB/sec 0.40 iops 4.04%, 4 read, 0 written, 3.20kB/sec 0.40 iops 5.62%, 15804 read, 1614 written, 12643.13kB/sec 1580.39 iops 5.62%, 3 read, 2 written, 2.40kB/sec 0.30 iops 5.62%, 4 read, 0 written, 3.20kB/sec 0.40 iops 5.62%, 3 read, 0 written, 2.40kB/sec 0.30 iops 5.62%, 3 read, 0 written, 2.40kB/sec 0.30 iops 6.86%, 12414 read, 1264 written, 9931.17kB/sec 1241.40 iops 6.86%, 3 read, 0 written, 2.40kB/sec 0.30 iops 6.86%, 2 read, 0 written, 1.60kB/sec 0.20 iops 7.18%, 3213 read, 343 written, 2570.39kB/sec 321.30 iops 8.34%, 11563 read, 1215 written, 9250.36kB/sec 1156.30 iops 8.34%, 3 read, 0 written, 2.40kB/sec 0.30 iops 8.34%, 4 read, 0 written, 3.20kB/sec 0.40 iops 8.34%, 3 read, 1 written, 2.40kB/sec 0.30 iops 8.64%, 3055 read, 276 written, 2443.98kB/sec 305.50 iops 10.57%, 19227 read, 1947 written, 15381.53kB/sec 1922.69 iops 10.57%, 3 read, 0 written, 2.40kB/sec 0.30 iops 10.57%, 4 read, 0 written, 3.20kB/sec 0.40 iops 10.57%, 3 read, 0 written, 2.40kB/sec 0.30 iops 10.57%, 2 read, 1 written, 1.60kB/sec 0.20 iops 10.57%, 7 read, 1 written, 5.60kB/sec 0.70 iops 11.32%, 7488 read, 752 written, 5990.38kB/sec 748.80 iops 11.32%, 3 read, 0 written, 2.40kB/sec 0.30 iops 13.32%, 20043 read, 1968 written, 16034.36kB/sec 2004.29 iops 13.32%, 3 read, 0 written, 2.40kB/sec 0.30 iops 13.32%, 4 read, 0 written, 3.20kB/sec 0.40 iops 13.32%, 3 read, 0 written, 2.40kB/sec 0.30 iops 13.32%, 4 read, 1 written, 3.20kB/sec 0.40 iops 13.32%, 5 read, 0 written, 4.00kB/sec 0.50 iops 15.12%, 17970 read, 1878 written, 14375.96kB/sec 1796.99 iops 15.12%, 4 read, 3 written, 3.20kB/sec 0.40 iops 15.12%, 5 read, 1 written, 4.00kB/sec 0.50 iops ^CCTRL-C Interrupt - stopping !%*@# -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
"Nicholson, Brad (Toronto, ON, CA)"
Дата:
> -----Original Message----- > From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance- > owner@postgresql.org] On Behalf Of Laurent Laborde > Sent: Tuesday, April 19, 2011 8:37 AM > To: pgsql-performance@postgresql.org > Subject: Re: [PERFORM] postgresql random io test with 2 SSD Kingston > V+100 500GB in (software) Raid1 > > If we use them (unlikely), recovery in case of power outage isn't a > problem, as we will use it on slave database (using Slony-I) that can > be created/destroyed at will. > And, anyway, our slave have fsync=off so the battery won't change > anything in case of power outage :) Are these on the same UPS? If so, you have a failure case that could cause you to lose everything. Brad.
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
On Tue, Apr 19, 2011 at 3:21 PM, Nicholson, Brad (Toronto, ON, CA) <bnicholson@hp.com> wrote: >> -----Original Message----- >> From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance- >> owner@postgresql.org] On Behalf Of Laurent Laborde >> Sent: Tuesday, April 19, 2011 8:37 AM >> To: pgsql-performance@postgresql.org >> Subject: Re: [PERFORM] postgresql random io test with 2 SSD Kingston >> V+100 500GB in (software) Raid1 >> >> If we use them (unlikely), recovery in case of power outage isn't a >> problem, as we will use it on slave database (using Slony-I) that can >> be created/destroyed at will. >> And, anyway, our slave have fsync=off so the battery won't change >> anything in case of power outage :) > > Are these on the same UPS? If so, you have a failure case that could cause you to lose everything. Oh, not at all. We're doing balancing/switch/failover between 2 different datacenter. We can maintain (somewhat degraded) operation if one of the datacenter fail :) -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
On Apr 19, 2011, at 8:49 AM, Laurent Laborde wrote: > Write Mode: 10% > Stallcheck at 1.000000 > Verbose > Unknown units of blocks > Arg: 1 > Read 1000000 blocks > Added /home/ssd/big1 > 2.01%, 20122 read, 1978 written, 16097.57kB/sec 2012.20 iops > 2.01%, 3 read, 0 written, 2.40kB/sec 0.30 iops > 2.01%, 3 read, 0 written, 2.40kB/sec 0.30 iops > 2.01%, 3 read, 0 written, 2.40kB/sec 0.30 iops > 3.82%, 18036 read, 1779 written, 14428.73kB/sec 1803.59 iops > 4.03%, 2175 read, 209 written, 1739.98kB/sec 217.50 iops > 4.03%, 3 read, 0 written, 2.40kB/sec 0.30 iops > 4.03%, 2 read, 0 written, 1.60kB/sec 0.20 iops > 4.04%, 4 read, 0 written, 3.20kB/sec 0.40 iops > 4.04%, 4 read, 0 written, 3.20kB/sec 0.40 iops The performance here looks like the old jmicron based ssds that had absolutely abysmal performance - the intel x25s do not suffer like this. The x25's however suffer from the power durability Greg has mentioned. (And they will eventually need to be security erase'd to restore performance - you'll start getting major write stalls). Looks like you were on the cusp of stalling here. btw, yay pgiosim! :) -- Jeff Trout <jeff@jefftrout.com> http://www.stuarthamm.net/ http://www.dellsmartexitin.com/
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
On Wed, Apr 20, 2011 at 2:39 PM, Jeff <threshar@torgo.978.org> wrote: > > The performance here looks like the old jmicron based ssds that had > absolutely abysmal performance - the intel x25s do not suffer like this. The > x25's however suffer from the power durability Greg has mentioned. (And > they will eventually need to be security erase'd to restore performance - > you'll start getting major write stalls). Looks like you were on the cusp of > stalling here. A review of the V+100 on the excellent anandtech : http://www.anandtech.com/show/4010/kingston-ssdnow-v-plus-100-review > btw, yay pgiosim! :) yay \o/ -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Shaun Thomas
Дата:
On 04/20/2011 09:01 AM, Laurent Laborde wrote: > A review of the V+100 on the excellent anandtech : > http://www.anandtech.com/show/4010/kingston-ssdnow-v-plus-100-review That's horrifying. 4.9MB/s random writes? 19.7MB/s random reads? That's at least an order of magnitude lower than other SSDs of that generation. I can't imagine that would be very good for database usage patterns by comparison. Especially with that aggressive garbage collection. I mean... an old Indilinx OCZ Vertex has better performance than that. -- Shaun Thomas OptionsHouse | 141 W. Jackson Blvd. | Suite 800 | Chicago IL, 60604 312-676-8870 sthomas@peak6.com ______________________________________________ See http://www.peak6.com/email_disclaimer.php for terms and conditions related to this email
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Laurent Laborde
Дата:
On Wed, Apr 20, 2011 at 5:40 PM, Shaun Thomas <sthomas@peak6.com> wrote: > On 04/20/2011 09:01 AM, Laurent Laborde wrote: > >> A review of the V+100 on the excellent anandtech : >> http://www.anandtech.com/show/4010/kingston-ssdnow-v-plus-100-review > > That's horrifying. 4.9MB/s random writes? 19.7MB/s random reads? That's at > least an order of magnitude lower than other SSDs of that generation. I > can't imagine that would be very good for database usage patterns by > comparison. Especially with that aggressive garbage collection. > > I mean... an old Indilinx OCZ Vertex has better performance than that We just orderer 2 Corsair C300 240GB to compare performance and see if the difference is as huge as claimed on anandtech's benchmark :) -- Laurent "ker2x" Laborde Sysadmin & DBA at http://www.over-blog.com/
Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
От
Marinos Yannikos
Дата:
Am 19.04.2011 11:15, schrieb Laurent Laborde: > Soft RAID1 (md) > ext3 We have experimented a bit with Postgres and ext3 (with and without Linux software RAID1) and have found that since somewhere after 2.6.18, it has been prohibitively slow and causing high latencies during buffer flushes. You will probably see a significant improvement with ext4 (mkfs.ext4, not just remount as ext4, which is also possible). Also, you need to make sure that your blocks are properly aligned with SSDs, that might explain low random I/O performance. See http://www.nuclex.org/blog/personal/80-aligning-an-ssd-on-linux and http://www.ocztechnologyforum.com/forum/showthread.php?54379-Linux-Tips-tweaks-and-alignment&p=373226&viewfull=1#post373226 for example. Regards, Marinos