We are using a 7210, 44 disks I believe, 11 stripes of RAIDz sets. When I installed I selected the best bang for the buck on the speed vs capacity chart.
We run about 30 VM's on it, across 3 ESX 4 servers. Right now, its all running NFS, and it sucks... sooo slow. iSCSI was no better. I am wondering how I can increase the performance, cause they want to add more vm's... the good news is most are idleish, but even idle vm's create a lot of random chatter to the disks! So a few options maybe... 1) Change to iSCSI mounts to ESX, and enable write-cache on the LUN's since the 7210 is on a UPS. 2) get a Logzilla SSD mirror. (do ssd's fail, do I really need a mirror?) 3) reconfigure the NAS to a RAID10 instead of RAIDz Obviously all 3 would be ideal , though with a SSD can I keep using NFS for the same performance since the R_SYNC's would be satisfied with the SSD? I am dreadful of getting the OK to spend the $$,$$$ SSD's and then not get the performance increase we want. How would you weight these? I noticed in testing on a 5 disk OpenSolaris, that changing from a single RAIDz pool to RAID10 netted a larger IOP increase then adding an Intel SSD as a Logzilla. That's not going to scale the same though with a 44 disk, 11 raidz striped RAID set. Some thoughts? Would simply moving to write-cache enabled iSCSI LUN's without a SSD speed things up a lot by itself? -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
