On 5/12/2011 4:49 AM, Markus Neviadomski wrote:
Am 12.05.2011 11:41, schrieb Stan Hoeppner:
It's becoming very clear you've not been in the SA game very long...
SA?
System Administration
Two mirrored would be better, so $400-1200 USD. This would
yield 50,000 seeks/second vs the 300 he has now, and ~250MB/s
bandwidth, vs the ~160MB/s he currently has.
Never use a single drive for important data. Dont tell this idea to
other people please!
Apparently you don't read thoroughly either. Note my words "Two
mirrored" above.
"would be better" here means: maybe we can do this, but without its also
ok. 95% of all financial bosses will choose cheapest solution, and this
is often not the "better" solution.
SSDs are inherently many times more reliable than [1]SRDs as they have
no moving parts and dissipate very little heat. They are electronic
devices and thus can eventually fail, but the probability of this
happening during a standard server's deployed 3-6 year lifespan is many
times lower than with SRDs.
Backup/restore from/to SSDs using D2D systems or a tape library is many
times faster than with RAIDED SRDs making mirroring/RAID less attractive
with SSDs. Using mirroring/RAID with SSDs can save you some downtime vs
a restore, but that doesn't make it mandatory. Ultimately, the decision
to mirror/RAID SSDs (or SRDs for that matter) is left to the SA, based
on his knowledge level of the technology, his risk analysis, his budget,
etc.
[1] SRD - Spinning Rust Disk - antiquated magnetic storage devices that
will likely disappear from the face of the earth in 20 years (or less).
--
Stan
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