From: Fabien Salvi <fabien@cri74.org>
To: Alex Tomas <bzzz@tmi.comex.ru>
Cc: linux-scsi@vger.kernel.org,
James Bottomley <James.Bottomley@steeleye.com>,
Jens Axboe <axboe@suse.de>
Subject: Re: hot scsi disk resize
Date: Tue, 04 Mar 2003 10:31:40 +0100 [thread overview]
Message-ID: <3E64727C.9040204@cri74.org> (raw)
In-Reply-To: m3bs0s9xij.fsf@lexa.home.net
Alex Tomas a écrit:
> Hello!
>
> Here is patch to implement hot scsi resize function.
> Modern storage boxes support virtualization feature and
> may change logical volume size online. I think it would
> be great if linux supports such abilities. Look at
> this example:
>
> root@zefir:# dmesg | tail
> scsi0:A:1:0: Tagged Queuing enabled. Depth 32
> SCSI device sda: 2097152 512-byte hdwr sectors (1074 MB)
> SCSI device sda: drive cache: write through
> sda: unknown partition table
> Attached scsi disk sda at scsi0, channel 0, id 1, lun 0
>
> root@zefir:# mount -treiserfs /dev/sda /mnt
>
> root@zefir:# df -Th
> Filesystem Type Size Used Avail Use% Mounted on
> /dev/hda1 ext3 1.9G 1.8G 138M 93% /
> /dev/sda reiserfs 1.0G 33M 991M 4% /mnt
>
> root@zefir:# echo 'scsi rescan 0 0 1 0' >/proc/scsi/scsi
> root@zefir:# dmesg|tail -n1
> SCSI device sda: 20971520 512-byte hdwr sectors (10737 MB)
> root@zefir:# resize_reiserfs /dev/sda
>
> <-------------resize_reiserfs, 2002------------->
> reiserfsprogs 3.6.4
>
> root@zefir:# df -Th
> Filesystem Type Size Used Avail Use% Mounted on
> /dev/hda1 ext3 1.9G 1.8G 138M 93% /
> /dev/sda reiserfs 10G 33M 9.9G 1% /mnt
Well, I also think it's a very important and needed feature for HA systems.
I'm very interested in such things...
But, I thought resize_reiserfs only resize *unmounted* filesystem :
http://www.reiserfs.org/resize_reiserfs.html
Will it work under IO load ?
Reiserfs has a way to do it dynamically while using it, with mount option :
http://www.reiserfs.org/mount-options.html
I've tested this without a lot of success (I encounter a lot of problems).
I'm afraid that even if scsi subsystem support the resize option,
FileSystems won't support it correctly...
Maybe with LVM ?
Did someone test it ?
--
Fabien SALVI Centre de Ressources Informatiques
Archamps, France -- http://www.cri74.org
PingOO GNU/linux distribution : http://www.pingoo.org
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2003-03-04 9:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-03 17:21 hot scsi disk resize Alex Tomas
2003-03-03 18:15 ` Christoph Hellwig
2003-03-04 5:37 ` Alex Tomas
2003-03-04 7:00 ` alexey
2003-03-17 16:21 ` James Bottomley
2003-03-17 16:30 ` Christoph Hellwig
2003-03-04 9:31 ` Fabien Salvi [this message]
2003-03-04 9:42 ` alexey
2003-03-05 10:18 ` Fabien Salvi
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=3E64727C.9040204@cri74.org \
--to=fabien@cri74.org \
--cc=James.Bottomley@steeleye.com \
--cc=axboe@suse.de \
--cc=bzzz@tmi.comex.ru \
--cc=linux-scsi@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