From: Luca Berra <bluca@comedia.it>
To: Gordon Henderson <gordon@drogon.net>
Cc: linux-raid@vger.kernel.org
Subject: Re: raid5: switching cache buffer size
Date: Fri, 13 Dec 2002 19:59:54 +0100 [thread overview]
Message-ID: <3DFA2E2A.20601@comedia.it> (raw)
In-Reply-To: <Pine.LNX.4.43.0212131530510.6085-100000@unicorn.drogon.net>
Gordon Henderson wrote:
> Anyone know what this means?
>
> My big server is currently fscking a lvm partition which sits on-top of a
> raid5 device and the console is scrolling these messages as fast as it can.
> It says it's switching from 0 to 512, from 512 to 0 and 0 to 1024 ( or
> maybe 512 to 1024, its hard to tell).
>
> What's happening and how do I stop it?
hi,
you probably have filesystems of different block in the volume group,
raid cache cannot cope with requests of varying block size so it has to
flush the cache each time, this only hurts performance and is not
problem for data safety.
fix:
1) make sure everything on your raid5 is the same block size, if you
have swap you are locked to using 4k blocks, if you are using snapshots
1k blocks, if you use both jump.
2) comment the printk in the raid5 source
L.
next prev parent reply other threads:[~2002-12-13 18:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-10 9:42 FSCK and it crashes Gordon Henderson
2002-12-10 10:22 ` Wim Vinckier
2002-12-10 18:58 ` Steven Dake
2002-12-10 19:04 ` Gordon Henderson
2002-12-13 15:38 ` raid5: switching cache buffer size Gordon Henderson
2002-12-13 18:59 ` Luca Berra [this message]
2002-12-13 19:17 ` Kanoalani Withington
2002-12-13 22:29 ` Gordon Henderson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3DFA2E2A.20601@comedia.it \
--to=bluca@comedia.it \
--cc=gordon@drogon.net \
--cc=linux-raid@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).