On Mon, Aug 3, 2009 at 3:34 PM, Joachim Sandvik <no-re...@opensolaris.org>wrote:
> I am looking at a nas software from nexenta, and after some initial testing > i like what i see. So i think we will find in funding the budget for a dual > setup. > > We are looking at a dual cpu Supermicro server with about 32gb ram and 2 > x250gb OS disks, 21 x 1TB SATA disks, and 1 x 64gb SSD disk. > > The system will use nexenta's auto-cdp which i think are based on AVS to > remote mirror to a system a few miles away. The system will mostly be > serving as a NFS server for our Vmware servers. We have about 80 vm's who > access the vmfs datastores. > > I have read that its smart to use a few small raid groups in a larger > pools, but i am uncertain about placing 21 disks in 1pool. > > The setup i have though of so far are: > > 1 pool with 3 x raidz2 groups with 6x1tb disks. 2x 64gb ssd for cache and 2 > spare disks. This should give us about 12TB > > An another setup i have been thinking about is: > > 1 pool with 9 x mirror with 2 x 1TB, also with 2 spares and 2 64gb SSD. > > Do anyone have a recommendation on what might be a good setup? FWIW, I think you're nuts putting that many VM's on SATA disk, SSD as cache or not. If there's ANY kind of I/O load those disks are going to fall flat on their face. VM I/O looks like completely random I/O from the storage perspective, and it tends to be pretty darn latency sensitive. Good luck, I'd be happy to be proven wrong. Every test I've ever done has shown you need SAS/FC for vmware workloads though. --Tim
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