On Fri, 25 Jul 2008, Robert Milkowski wrote: > Both on 2540 and 6540 if you do not disable it your performance will > be very bad especially for synchronous IOs as ZIL will force your > array to flush its cache every time. If you are not using ZFS on any > other storage than 2540 on your servers then put "set > zfs:zfs_nocacheflush=1" in /etc/system and do a reboot. If you > haven't done so it should help you considerably.
This does not seem wise since then data (records of trades) may be lost if the system crashes or loses power. It is much better to apply the firmware tweaks so that the 2540 reports that the data is written as soon as it is safely in its NVRAM rather than waiting for it to be on disk. ZFS should then perform rather well with low latency. However, I have yet to see any response from Tharindu which indicates he has seen any of my emails regarding this (or many emails from others). Based on his responses I would assume that Tharindu is seeing less than a third of the response messages regarding his topic. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
