On Jul 30, 2009, at 9:26 AM, Bob Friesenhahn wrote:
On Thu, 30 Jul 2009, Ross wrote:
Without spare drive bays I don't think you're going to find one
solution that works for x4500 and x4540 servers. However, are
these servers physically close together? Have you considered
running the slog devices externally?
This all sounds really sophisticated and complicated. While I have
not yet held one of these SSDs in my own hands, it seems that they
are rather small (laptop sized) SATA devices. If a SATA port can be
found (or installed) into the chassis, how about just using stout
velcro to affix the drive to the inside of the chassis, and run
cables to it? Shouldn't that work?
If you want to go down the path of "unsupported" then, IIRC, there is an
"unsupported" CF slot on the X4500 mobo. This was brought out to the
back for the X4540. This is consistent with other Sun designs at the
time where CFs are available as boot devices. Now they are using the
MiniFlashDIMMs.
Do these SSDs require a lot of cooling? Traditional drive slots are
designed for hard drives which need to avoid vibration and have
specific cooling requirements. What are the environmental
requirements for the Intel X25-E?
Operating and non-operating shock: 1,000 G/0.5 msec (vs operating shock
for Barracuda ES.2 of 63G/2ms)
Power spec: 2.4 W @ 32 GB, 2.6W @ 64 GB. (less than HDDs @ ~8-15W)
MTBF: 2M hours (vs 1.2M hours for Barracuda ES.2)
Vibration specs are not consistent for comparison.
Compare:
http://download.intel.com/design/flash/nand/extreme/319984.pdf
vs
http://www.seagate.com/docs/pdf/datasheet/disc/ds_barracuda_es_2.pdf
Interesting that they are now specifying write endurance as:
1 PB of random writes for 32GB, 2 PB of random writes for 64GB.
Except for price/GB, it is game over for HDDs. Since price/GB is
based on
Moore's Law, it is just a matter of time.
-- richard
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