Monish Shah wrote:
A related question: If you are on a UPS, is it OK to disable ZIL?
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*.
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 UPSes
I'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
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
