On Mon, Aug 3, 2009 at 10:18 PM, Tim Cook <t...@cook.ms> wrote: > > > 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 >
As has been so kindly pointed out to me, I should clarify. When I say "SATA" disks, I mean 7200RPM or 5400RPM disks meant for bulk storage. The interface of that disk is not important (FC, SATA, or SAS). VMware should go on 15k disks if at all possible, regardless of interface. While I'm unaware of any 15k disks that use anything but FC, SAS, or SCSI interfaces, it is technically possible for them to use SATA. --Tim
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