Scott Lawson
Tue, 30 Jun 2009 03:17:33 -0700
Monish Shah wrote:
I think the answer to this is no. UPS's do fail. If you have two redundant units, answer *might* be maybe. But prudence says *no*.A related question: If you are on a UPS, is it OK to disable ZIL?
I have seen numerous UPS' failures over the years, cascading UPS failures as well by poorly engineered electrical systems supporting server environments (or even more poorly managed and maintained). One would have to weigh up the risk against the gain really and that would be *very* specific to any environment. The only time IMO would be if the data is disposable and recreating your pool and data is not an issue. (and all of the accompanying downtime that would go with it is acceptable)
Really no one should disable the ZIL, rather look into write optimzed SSD's for the ZIL instead. Particularly if you are that
interested in performance that you are considering disabling your ZIL.
The evil tuning guide says "The ZIL is an essential part of ZFS and should never be disabled." However, if you have a UPS, what can go wrong that really requires ZIL?Opinions? Monish ----- Original Message ----- From: "Ross" <no-re...@opensolaris.org> To: <zfs-discuss@opensolaris.org> Sent: Tuesday, June 30, 2009 3:04 PM Subject: Re: [zfs-discuss] ZFS, power failures, and UPSesI've seen enough people suffer from corrupted pools that a UPS is definitely good advice. However, I'm running a (very low usage) ZFS server at home and it's suffered through at least half a dozen power outages without any problems at all.I do plan to buy a UPS as soon as I can, but it seems to be surviving very well so far.-- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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