Hi,
i think, the local ZFS filesystem with raidz on the 7210 is not the
problem (when there are fast HDs), but you can test it with e.g.
bonnie++ (downloadable at sunfreeware.com), also NFS should not be the
problem because iscsi is also very slow(isn´t it?).
some other ideas are:
Network connection (did you test the network speed to the NAS?), maybe
upgrade to 10gbit, when it is the bottleneck. You can test the
speed/bandwith, when log on an ESX host via ssh and create a bigger
(10GByte) virtual disk (vmdk) on an NFS mounted share (time
/usr/sbin/vmkfstools -c 10G -d eagerzeroedthick /nfspath/test.vmdk).
It is also possible, that the VMs are the bottleneck, VM-guests with
heavy small (virtual-)HD access like databases can also penetrade a NAS
and the network connection with many small IP-packets, so an 1GBit
connection could be to slow (but virtualiziation of bigger databases
with many access is not a good idea).
When you have a test-NAS you can test varios thinks like disabling ZIL
and let run a VM on this NAS.
i hope i could help you a little, we have also VSphere 4 with a Solaris
10 NAS (NFS) and it runs very fine, but only VMs w/o or with small
databases and a Raid-Controller with BBU-write cache and Raid 5
regards (sorry for my english ;-)
Axel Denfeld
Mark schrieb:
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?
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