On 03/17/2013 04:03 PM, Mark Nelson wrote:
On 03/17/2013 05:40 PM, Matthieu Patou wrote:
Hello all,
Our dev environment are quite I/O intensive but didn't require much
space (~20G per dev environment), for the moment our dev machines are
served by VMWare and the storage is done in NFS appliances with SAS or
SATA drives.
After some testing with consumer grade SSD we discovered that built
speed could be greatly improved by using SSD but having SSD in NFS
appliances is very costly.
So I'm thinking of using consumer grade or even intel s3700 SSD and ceph
as the backend storage. Is there any cons using SSD for data storage
(apart from the price per GB that is higher than SAS drives) ?
Were you thinking of using CephFS? If so, be aware that it's not
really recommended for production use yet.
No it's RBD
If you were thinking RBD, that's fine, but you should be aware that
you may need to do some tweaking and have a lot of concurrency to get
high IOPS. I'd highly recommend testing out your use case on a small
scale (maybe a 1 or 2 nodes with a couple of SSDs before diving in
head first.
I had a plan for a prototype with 2 nodes and then a next step with 3
nodes and 4 SSD each.
Obviously if I don't want to lose my data I need to have twice has much
space that is required so that objects are at least stored twice, is
there anything else that I need to pay attention too ?
In a previous job we had some consumer grade SSDs used for Lustre
journals. They tended to die pretty quickly, and often in clumps.
That was a couple of years ago and consumer grade drives have improved
since then, but I'd definitely be tempted to go with the S3700. It
looks like a fantastic drive.
Ok thanks for the feedback, when I see $1800 for 100GB SSD or even more
I have hicups as I could probably change 10 time the hard drives and
still be cheaper than the price of enterprise grade ones. I guess this
needs to be tested a bit more in order to get a better idea.
Matthieu.
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