Re: New server: SSD/RAID recommendations?

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От Karl Denninger
Тема Re: New server: SSD/RAID recommendations?
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Msg-id 559C06ED.10706@denninger.net
обсуждение исходный текст
Ответ на Re: New server: SSD/RAID recommendations?  ("Graeme B. Bell" <graeme.bell@nibio.no>)
Список pgsql-performance
After a plug-pull during the create, reboot and here is the verify:

root@Dbms2:/var/tmp # ./diskchecker.pl -s newfs verify /test/biteme
 verifying: 0.00%
 verifying: 3.81%
 verifying: 10.91%
 verifying: 18.71%
 verifying: 26.46%
 verifying: 33.95%
 verifying: 41.20%
 verifying: 49.48%
 verifying: 57.23%
 verifying: 64.89%
 verifying: 72.54%
 verifying: 80.04%
 verifying: 87.96%
 verifying: 95.15%
 verifying: 100.00%
Total errors: 0

da6 at mps0 bus 0 scbus0 target 17 lun 0
da6: <ATA INTEL SSDSC2BP24 0420> Fixed Direct Access SPC-4 SCSI device
da6: Serial Number BTJR446401KW240AGN 
da6: 600.000MB/s transfers
da6: Command Queueing enabled
da6: 228936MB (468862128 512 byte sectors: 255H 63S/T 29185C)

# smartctl -a /dev/da6

=== START OF INFORMATION SECTION ===
Model Family:     Intel 730 and DC S3500/S3700 Series SSDs
Device Model:     INTEL SSDSC2BP240G4
Serial Number:    BTJR446401KW240AGN
LU WWN Device Id: 5 5cd2e4 04b71afc7
Firmware Version: L2010420
User Capacity:    240,057,409,536 bytes [240 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
Form Factor:      2.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 2.6, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Jul  7 17:01:36 2015 CDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

Note -- same firmware between all three series of Intel devices...... :-)

Yes, I like these SSDs -- they don't lie and they don't lose data on a power-pull.


On 7/7/2015 08:08, Graeme B. Bell wrote:
Thanks, this is very useful to know about the 730. When you say 'tested it with plug-pulls', you were using diskchecker.pl, right?

Graeme.

On 07 Jul 2015, at 14:39, Karl Denninger <karl@denninger.net> wrote:

Incidentally while there are people who have questioned the 730 series power loss protection I've tested it with plug-pulls and in addition it watchdogs its internal power loss capacitors -- from the smartctl -a display of one of them on an in-service machine here:

175 Power_Loss_Cap_Test     0x0033   100   100   010    Pre-fail  Always       -       643 (4 6868)



--
Karl Denninger
karl@denninger.net
The Market Ticker
[S/MIME encrypted email preferred]
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