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SRT SSD Cache for RAID Drives
- Thread starter -Dragon-
- Start date
drescherjm
[H]F Junkie
- Joined
- Nov 19, 2008
- Messages
- 14,933
Also Linux now has this ability with flashcache although I have not tested it with raid yet.
https://github.com/facebook/flashcache
And there are hw raid cards that use ssds for cache.
https://github.com/facebook/flashcache
And there are hw raid cards that use ssds for cache.
Chrisroman
Gawd
- Joined
- May 29, 2011
- Messages
- 692
Sounds a bit like this to me, http://www.newegg.com/Product/Product.aspx?Item=N82E16822148591
But on a RAID array, you're probably close to if not already exceeding the seq read/write of a single SSD. So this type of cache would only be helpful for random small file access. in which case this would help but you would see far better results from a block level cache of say 1GB ram per 4TB raid array.
EDIT:
Here's an SSD bench of my 12TB RAID 6 array. Keep in mind these are slow 5400 rpm green drives and a AReca 1230 controller (slow by todays standards). This is with 3.5GB of block level cache. I can move around 5GB files in a few seconds. And the random 4k access is still 5x faster than what an RST SSD setup would yield. The point is that is adds a lot of zip to a modest RAID setup.
But on a RAID array, you're probably close to if not already exceeding the seq read/write of a single SSD. So this type of cache would only be helpful for random small file access. in which case this would help but you would see far better results from a block level cache of say 1GB ram per 4TB raid array.
EDIT:
Here's an SSD bench of my 12TB RAID 6 array. Keep in mind these are slow 5400 rpm green drives and a AReca 1230 controller (slow by todays standards). This is with 3.5GB of block level cache. I can move around 5GB files in a few seconds. And the random 4k access is still 5x faster than what an RST SSD setup would yield. The point is that is adds a lot of zip to a modest RAID setup.
Last edited:
Did you happen to see the SRT thread that's stickied at the top of the forum?
My verdict on SRT = "meh" if you can afford a decently sized SSD.
ahh, now theres the information that should have been included in post #1 so that we didnt have to go guessing about linux or ZFS and stuff.
i guess 7 posts in is better than never