Hi, Thanks for the input,and indeed my first choice is use mirror vdevs and avoid raidz.However the price for that can be too high... Iam running some benchmarks with iozone,filebench etc, but it's always a question of what defines good performance? For instance since all.network is gigabit I would assume that raidz or mirror with 20+ disks would be able to saturate the link..however latency of read/write operations would probably be the key point for this environment.
Anyway I would love to see common best practices to at least avoid common mistakes. Bruno Sent from my HTC ----- Reply message ----- From: "Giovanni Tirloni" <gtirl...@sysdroid.com> Date: Thu, Jun 17, 2010 22:28 Subject: [storage-discuss] ZPOOL configuration advise To: "bso...@epinfante.com" <bso...@epinfante.com> Cc: "storage-discuss@opensolaris.org" <storage-discuss@opensolaris.org> On Thu, Jun 17, 2010 at 2:32 PM, bso...@epinfante.com <bso...@epinfante.com> wrote: > Hi all, > > Once again here's yet another question for zpool configuration,and hope to > read your comments soon. > Now going to the business I have a system with the following specs: > - 32 GB ram,8cpus > - 2 hba's with 512mb ram each with battery > - 2 jbod's with 12 disks (SATA 1Tb) > > The purpose for this system is to host a few virtual machines (xen based) > over NFS and to provide ISCSI volumes to a windows vm to host a ,small, sql > server instance. > > Now I've thought of having 2 zpools: > > - a 6 x 2 mirror (12 drives used) to be used by the iscsi volume for the > sql database > - a 2 x 5 raidz (10 drives used) to be used to hold the vm's in a NFS share > - add one drive to each zpool as a hot-spare > > Since I have 2 hba's I would configure each vdev as having one disk per hba. > I don't have any ssd to use as a zil device,but I think that the cache on of > the hba would help on that. > > Given the above scenario ,how does it looks like the purposed configuration? > I wouldn't advise you to use raidz for anything that requires performance (unless you can aggregate enough vdev's). If your space requirements for the Xen VMs can be met by using mirrors, go for it. You best option is to set up a test environment, mount the iSCSI volumes and NFS shares and test with something like iozone. Everybody here can suggest dozens of different configurations but in the end it's all about what you require. -- Giovanni -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
_______________________________________________ storage-discuss mailing list storage-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/storage-discuss
