Re: hot scsi disk resize

Fabien Salvi
2003-03-05T10:18:09Z

alexey@technomagesinc.com a écrit:
>>>>>>Fabien Salvi (FS) writes:
>>>>>
>
> FS> Well, I also think it's a very important and needed feature for
> FS> HA systems. I'm very interested in such things...
>
> FS> But, I thought resize_reiserfs only resize *unmounted* filesystem
> FS> : http://www.reiserfs.org/resize_reiserfs.html
>
> citate from this URL: "The resize_reiserfs program allows to grow a
> reiserfs on-line if there is a free space on block device."

Yes, you're right !
I haven't seen this...
It's a bit strange, it contradicts what is said on the first line :)

> FS> Will it work under IO load ?
>
> I tested it several times under different load (read-only, write-only,
> read-write, single-thread and multi-thread tests). I think reiserfs
> team may give comments.

> FS> Reiserfs has a way to do it dynamically while using it, with
> FS> mount option : http://www.reiserfs.org/mount-options.html
>
> FS> I've tested this without a lot of success (I encounter a lot of
> FS> problems).
>
> what kind of problem have you seen? what versions of kernel/reiserfs/tools?

Well, I made some tests one year ago, I will try this again, as you say
it seems to work well, it's interested...
I will let you know my new results.

> FS> I'm afraid that even if scsi subsystem support the resize option,
> FS> FileSystems won't support it correctly... Maybe with LVM ?
>
> FS> Did someone test it ?
>
>>From filesystem point of view, LVM and resizable SCSI HDD are the same
> think - just block device which may grow.
>
> I think this patch is just one more step in the right direction.

Yes, surely !

--
Fabien SALVI Centre de Ressources Informatiques
Archamps, France -- http://www.cri74.org
PingOO GNU/linux distribution : http://www.pingoo.org

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