Gentoo Archives: gentoo-user

From: Uwe Thiem <uwix@××××.na>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] BIG reiserfs problem
Date: Mon, 30 Oct 2006 10:19:41
Message-Id: 200610301204.54376.uwix@iway.na
In Reply to: Re: [gentoo-user] BIG reiserfs problem by Alan McKinnon
1 On 28 October 2006 23:39, Alan McKinnon wrote:
2 > On Saturday 28 October 2006 16:41, b.n. wrote:
3 > > Dale ha scritto:
4 > > > If you use XFS, make sure you have good power. XFS does not like
5 > > > power failures at all. I have had to reinstall on a second rig
6 > > > because of this very problem. If you have a UPS, that may be OK.
7 > >
8 > > Thanks a lot for the advice. Power outages do happen and I don't have
9 > > an UPS. Why does it happen? Isn't XFS journaled?
10 >
11 > Yes it is journaled but it also allows data to be very aggressively
12 > cached. Make that VERY aggressively cached. With the result that data
13 > can be held in a huge cache somewhere and the kernel can be convinced
14 > it has been written to disk.
15
16 No journaled filesystem can 100% prevent data loss or even filesystem
17 corruption in cases of power outages. Think of the the builtin caches of your
18 drive. If that builtin cache contains a changed journal (not written to the
19 actual drive yet) when a power failure occurs => bang!
20
21 Uwe
22
23 --
24 Mark Twain: I rather decline two drinks than a German adjective.
25 http://www.SysEx.com.na
26 --
27 gentoo-user@g.o mailing list

Replies

Subject Author
Re: [gentoo-user] BIG reiserfs problem Alan McKinnon <alan@××××××××××××××××.za>