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hp - PostgreSQL server: 10k RPM SAS or Intel 520 Series SSD drives?

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We will be expanding the storage for a
PostgreSQL server and one of the things we are considering is using SSDs (Intel 520
Series) instead of rotating discs (10k RPM). Price per GB is comparable and we expect
improved performance, however we are concerned about longevity since our database usage
pattern is quite write-heavy. We are also concerned about data corruption in case of
power failure (due to SSDs write cache not flushing
properly).




We currently use RAID10
with 4 active HDDs (10k 146GB) and 1 spare configured in the controller. It's a HP DL380
G6 server with P410 Smart Array Controller and
BBWC.



What makes more sense: upgrading the
drives to 300GB 10k RPM or using Intel 520 Series SSDs (240GB)?



Answer




If you're using a server equipped with a Smart Array P400 controller, you're
dealing with a G5-era 300-series ProLiant (DL360 G5, DL380 G5, etc.) or a G4/G5-era
500-series ProLiant (DL580, ML570). All of those systems were eclipsed in 2009 or
before, so your system is several revisions behind and you're leaving performance on the
table...



That said, you can use the Intel SSD's
on your P400 controller. Understand that the P400 is only a 3Gb/s SAS
controller.



Upgrade the controller
firmware first.




They will
provide some advantage on writes. Adjust your RAID controller's cache ratio to 75:25
write:read. href="https://serverfault.com/questions/401488/non-volatile-cache-raid-controllers-what-kind-of-protection-is-there-against-nv">By
having a battery-backed unit (BBWC), the lack of a supercapacitor on your
Intel 520 SSD is not an issue. (you'd have the same concern with spinning disks and no
BBWC, right?)



Since storage space is your goal,
you could also add four more 146GB disks and expand your existing
array. There's a benefit there if you have the drive bays to support.



Either way, you have several options.



Edit:



Notes
on SSD's and P410 controllers:




href="https://serverfault.com/questions/401026/what-raid-controller-comes-with-dl360-g7/401030#401030">What
RAID controller comes with DL360
G7?



href="https://serverfault.com/questions/431437/hp-p410-raid-samsung-830-ssds-debian-6-0-what-performance-to-expect/431456#431456">HP
P410 RAID + Samsung 830 SSDs + Debian 6.0 - What performance to
expect?


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