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SSD dives install in Promise Raid array

post #1 of 6
4/19/10 at 2:01pm
Thread Starter 
Forgetting about cost just now is there any reason why a promise array could not be fitted with SSD drives?

Thinking Promise VTrak E-Class SATA RAID Subsystem or similar.

???
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post #2 of 6
4/22/10 at 10:25am
Thread Starter 
any geniuses around to help
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post #3 of 6
4/22/10 at 10:29am
Quote:
Originally Posted by emeldahay View Post

any geniuses around to help

As long as it supports 2.5 inch drives I think it could be done (expensively).
Depending on the SSD the limiting factor would be the 3Gbps SATA bus.

A single fast SSD drive now can saturate a 3Gbps bus. We need 6Gbps a second and
even that won't be enough for a SSD RAID system.

Sickening ..in the best way possible
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post #4 of 6
4/25/10 at 11:03am
Thread Starter 
Quote:
Originally Posted by hmurchison View Post

As long as it supports 2.5 inch drives I think it could be done (expensively).
Depending on the SSD the limiting factor would be the 3Gbps SATA bus.

A single fast SSD drive now can saturate a 3Gbps bus. We need 6Gbps a second and
even that won't be enough for a SSD RAID system.

Sickening ..in the best way possible

is it possible to saturate the promise array 3gbps bus with normal drives?

Would a particular drive speed be required in the array?

thanks for the reply!
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post #5 of 6
4/25/10 at 1:02pm
Quote:
Originally Posted by emeldahay View Post

is it possible to saturate the promise array 3gbps bus with normal drives?

Would a particular drive speed be required in the array?

thanks for the reply!

3Gbps would be 375MB/s - you get 10k drives that can do 145MB/s so 3 of them in RAID-0 should do it. Not much point in doing that on the consumer side though as you'll only get 90MB/s over FW800:

http://www.promise.com/storage/raid_...sn1=40&rsn3=28
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post #6 of 6
4/25/10 at 1:14pm
Quote:
Originally Posted by emeldahay View Post

is it possible to saturate the promise array 3gbps bus with normal drives?

Would a particular drive speed be required in the array?

thanks for the reply!

Yes look at how the Crucial SSD loses about 25% of its throughput performance when it's on 3Gbps versus 6Gbps.

http://www.anandtech.com/show/3667/o...-mp-firmware/4

Keep in mind this is a single SSD. There's probably not an affordable chassis in production that would let you reap the rewards of a few SSD in a RAID configuration without severely hampering throughput performance.
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