Re: Best OS & Configuration for Dual Xeon w/4GB & Adaptec
От | PFC |
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Тема | Re: Best OS & Configuration for Dual Xeon w/4GB & Adaptec |
Дата | |
Msg-id | op.s6qjfec3cigqcu@apollo13 обсуждение исходный текст |
Ответ на | Re: Best OS & Configuration for Dual Xeon w/4GB & Adaptec (Miguel <mmiranda@123.com.sv>) |
Ответы |
Re: Best OS & Configuration for Dual Xeon w/4GB & Adaptec
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Список | pgsql-performance |
This is a 2-Disk Linux software RAID1 with 2 7200RPM IDE Drives, 1 PATA and 1 SATA : apollo13 ~ # hdparm -t /dev/md0 /dev/md0: Timing buffered disk reads: 156 MB in 3.02 seconds = 51.58 MB/sec apollo13 ~ # hdparm -t /dev/md0 /dev/md0: Timing buffered disk reads: 168 MB in 3.06 seconds = 54.87 MB/sec This is a 5-Disk Linux software RAID5 with 4 7200RPM IDE Drives and 1 5400RPM, 3 SATA and 2 PATA: apollo13 ~ # hdparm -t /dev/md2 /dev/md2: Timing buffered disk reads: 348 MB in 3.17 seconds = 109.66 MB/sec apollo13 ~ # hdparm -t /dev/md2 /dev/md2: Timing buffered disk reads: 424 MB in 3.00 seconds = 141.21 MB/sec apollo13 ~ # hdparm -t /dev/md2 /dev/md2: Timing buffered disk reads: 426 MB in 3.00 seconds = 141.88 MB/sec apollo13 ~ # hdparm -t /dev/md2 /dev/md2: Timing buffered disk reads: 426 MB in 3.01 seconds = 141.64 MB/sec The machine is a desktop Athlon 64 3000+, buggy nforce3 chipset, 1G DDR400, Gentoo Linux 2.6.15-ck4 running in 64 bit mode. The bottleneck is the PCI bus. Expensive SCSI hardware RAID cards with expensive 10Krpm harddisks should not get humiliated by such a simple (and cheap) setup. (I'm referring to the 12-drive RAID10 mentioned before, not the other one which was a simple 2-disk mirror). Toms hardware benchmarked some hardware RAIDs and got humongous transfer rates... hm ?
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