Marion Hakanson wrote: > [EMAIL PROTECTED] said: > >> They clearly suggest to disable cache flush http://www.solarisinternals.com/ >> wiki/index.php/ZFS_Evil_Tuning_Guide#FLUSH . >> >> It seems to be the only serious article on the net about this subject. >> >> Could someone here state on this tuning suggestion ? My cu is running a HDS >> SAN array with Oracle on ZFS, I'd like to be clear in my brain. >> > > There is a brief discussion (in which I participated) at the HDS user > forum site: > http://forums.hds.com/index.php?showtopic=427 > > Note that we made the change on the array itself, instead of using the > ZFS kernel tunable parameter. Our servers have other storage devices > besides our HDS array, and it's only recently that the tunable has made > its way into standard Solaris-10 releases. > > I can say that for us, telling the HDS array to ignore sync-cache requests > made a huge improvement in performance for our NFS clients. The increase > was small for local ZFS operations, including for Oracle, so you'll want > to measure for yourself. >
Interesting. The HDS folks I talked to said the array no-ops the cache sync. Which models were you using? Midrange only, right? _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
