Re: ISILON storage/FILE DEVCLASS performance issues

No, this is an NFS server setting, but I'm not sure that it's tunable on Isilon. On Linux and Solaris, it defaults to some very low value, which is fine for sequential I/O but really slows down random I/O. On Linux, RPCNFSDCOUNT can be tuned from the default of 8 to 512, which is fine as long as

Re: ISILON storage/FILE DEVCLASS performance issues

We did some quick research and "NFS thread" controls don't apply in our situation and can't be set. Or are you referring to the mountlimit value for the devclass? On Mon, May 14, 2018 at 9:31 AM, Skylar Thompson wrote: > This sounds pretty good to me. If you can, I would boost

Re: ISILON storage/FILE DEVCLASS performance issues

Thanks for the ideas. Much appreciated. I also looked at some AIX stats today and they have pointed me at a few hypervisor tuning options. Cheers Steve. On Mon, 14 May 2018, 23:32 Skylar Thompson, wrote: > This sounds pretty good to me. If you can, I would boost your NFS

Re: ISILON storage/FILE DEVCLASS performance issues

This sounds pretty good to me. If you can, I would boost your NFS thread count past the number of CPUs that you have, since a lot of NFS is just waiting for the disks to respond. You still need a thread for that, but it won't consume much CPU. On Mon, May 14, 2018 at 08:27:27AM -0400, Zoltan

Re: ISILON storage/FILE DEVCLASS performance issues

Do you see consistent NFS throughput, or is it bursty? We've never used Isilon as storage for TSM, but we have had problems generally with too-low NFS timeouts causing NFS to back off for too long. You can also see this problem manifest itself with NFS timeout messages in the kernel log. On Fri,

Re: ISILON storage/FILE DEVCLASS performance issues

Very interesting. This supports my idea on how I want to layout the new/replacement server. The old server is only 16-threads and certainly could not handle dedup (we can't afford any appliances like DD) since it is bucking under the current backups traffic. The new server has 72-threads as well

Re: [EXTERNAL] Re: ISILON storage/FILE DEVCLASS performance issues

AIX does supported NFSv4. I'd love to get the time to try it out, but DataDomains only support NVSv4 with the newest release and we are several levels back. https://www.redbooks.ibm.com/redbooks/pdfs/sg246657.pdf When our admins found that multiple/concurrent mount points helped for