Re: [zfs-discuss] What causes slow performance under load?

2009-04-21 Thread Patrick Skerrett
I'm fighting with an identical problem here am very interested in this thread. Solaris 10 127112-11 boxes running ZFS on a fiberchannel raid5 device (hardware raid). Randomly one lun on a machine will stop writing for about 10-15 minutes (during a busy time of day), and then all of a

Re: [zfs-discuss] ZIL SSD performance testing... -IOzone works great, others not so great

2009-04-10 Thread Patrick Skerrett
Thanks for the explanation folks. So if I cannot get Apache/Webdav to write synchronously, (and it does not look like I can), then is it possible to tune the ARC to be more write-buffered heavy? My biggest problem is with very quick spikes in writes periodically throughout the day. If I

Re: [zfs-discuss] ZIL SSD performance testing... -IOzone works great, others not so great

2009-04-10 Thread Patrick Skerrett
that happen once or twice a day. The rest of the time everything runs very smooth. Thanks. Eric D. Mudama wrote: On Fri, Apr 10 at 8:07, Patrick Skerrett wrote: Thanks for the explanation folks. So if I cannot get Apache/Webdav to write synchronously, (and it does not look like I can

Re: [zfs-discuss] ZIL SSD performance testing... -IOzone works great, others not so great

2009-04-10 Thread Patrick Skerrett
Yes, we are currently running ZFS, just without L2 ARC, or offloaded ZIL. Mark J Musante wrote: On Fri, 10 Apr 2009, Patrick Skerrett wrote: degradation) when these write bursts come in, and if I could buffer them even for 60 seconds, it would make everything much smoother. ZFS already

[zfs-discuss] ZIL SSD performance testing... -IOzone works great, others not so great

2009-04-09 Thread Patrick Skerrett
Hi folks, I would appreciate it if someone can help me understand some weird results I'm seeing with trying to do performance testing with an SSD offloaded ZIL. I'm attempting to improve my infrastructure's burstable write capacity (ZFS based WebDav servers), and naturally I'm looking at