On Thu, Mar 19, 2009 at 1:36 AM, Steve Mitchell <[email protected]> wrote: > Folks, > I've tried finding a definitive answer to this, and have not been able to - > please forgive if I'm posting in the wrong area... > > I have tried in the last week 2008.11, 2008.5, and the most recent version of > the Community Edition. In all cases, I have followed the many documents out > on the 'net for configuring an iSCSI target server for an ESX cluster I have. > In addition, I have also tried an NFS server. > > In all cases, network performance is bottlenecking for some reason. With > iSCSI, it's between 1-4MB/sec. With NFS, it's around 35MB/sec. I've seen > various posts with folks having similar problems, but no resolutions. > > I have ZFS configured underneath, and have tried this on three different high > end Dell server systems, all with the same result. I've changed network > cards, tried different switches, changed flow control and jumbo frames in > places, and tried at least 10 different changes to iSCSI recommended in the > various community forums and mailing lists. > > Is iSCSI performance just broken? Is NFS really limited to 35MB/sec, even > without ESX? (I've tested with a local machine mounting NFS). > > I've isolated that it's not my hardware, not my network, and not my clients > (they're performing far better against several other iSCSI implementations - > both hardware and software, as well as other NFS implementations). > > I really, really, really want to use ZFS and all of the other benefits for an > 8T array that I need to deploy in a week or so, but not if I can't get iSCSI > or NFS performing better. Any resources are appreciated... > > -s > _______________________________________________ > opensolaris-discuss mailing list > [email protected] >
I have many iSCSI volumes on my X4540, on a stock configuration, the performance sucks. You really need a DRAM based ZFS log device, or to disable the ZIL (which is what we did). Otherwise, NFS and iSCSI performance will be awful. -- Brent Jones [email protected] _______________________________________________ opensolaris-discuss mailing list [email protected]
