> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of Wolfraider > > target mode, using both ports. We have 1 zvol connected to 1 windows > server and the other zvol connected to another windows server with both > windows servers having a qlogic 2462 fibrechannel adapter, using both > ports and MPIO enabled. The windows servers are running Windows 2008 > R2. The zvols are formatted NTFS and used as a staging area and D2D2T > system for both Commvault and Microsoft Data Protection Manager backup > solutions. The SAN system sees mostly writes since it is used for > backups.
iscsi initiated by windows, ntfs, mostly write. Yup, I bet you're seeing a ton of zil activity. zilstat is the preferred way to see how much zil you're using, but if you can't get that to work, and if you are willing to export & import your zpool, you can temporarily disable the zil. http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29 If you disable the zil, and there's no performance gain, then you know you weren't using the zil. If you are indeed bottlenecked by the zil, then disabling the zil will dramatically improve performance. You would, however, be susceptible to data loss in the event of a system crash. So you shouldn't leave it disabled on an ongoing basis. When you install dedicated log devices, your goal is to make performance more similar to the "disabled zil" performance, without running the risk of disabled zil. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
