Re: An XFS Log partition in the root disk?
From: Igor Sobrado (sobrado_at_string1.ciencias.uniovi.es)
Date: 08/16/04
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Date: Mon, 16 Aug 2004 14:00:56 +0000 (UTC)
Walter Roberson <roberson@ibd.nrc-cnrc.gc.ca> wrote:
> In article <cfobub$12e$1@localhost.localdomain>,
> Igor Sobrado <sobrado@string1.ciencias.uniovi.es> wrote:
> :An interesting question, though. How can we set up a xfslog partition
> :in the root disk?
Hi Walter.
Thanks a lot for your detailed answer to my question!
> It already has an internal log. You cannot set up a separate
> log partition for the root partition, and you cannot have the root
> partition be part of a multi-ve xlv (but you -can- have the root
> partition be mirrored, if you have the appropriate license.)
Indeed, XFS supports both internal and external log. XFS is a
reliable and robust filesystem; both XFS and Veritas filesystem
are the best ones I know of.
> The reason for the above restrictions on the root partition, is that
> sash, the program that loads up /unix, has to know enough about the
> filesystem in order to -find- /unix -- and sash doesn't know above
> external xfs logs or about multi-partition root filesystems. You have
> to keep / itself simple so that you can boot your machine.
I supposed that there was a problem with the stand-alone shell too.
As you said, sash does not know a lot about filesystems; this program
only knows how finding and booting the IRIX kernel. It is flexible
and highly customizable, but it does not understands complex filesystem
layouts, like external logging. I am not surprised sash does not
understands external XFS logs or disk stripping. But it supports the
feature that is really required, disk mirroring. I fully agreed with
you about keeping the root filesystem as simple as possible.
The same restrictions apply to my Siemens Nixdorf RM600 running
SINIX 5.42A10; sash supports Veritas on that machine, but complex
RAID configurations cannot be applied to the root filesystem.
Sadly, I cannot afford a plexing license for mirroring. It would be
a nice feature. Hopefully booting from installation media is
possible too.
> These restrictions apply -only- to the filesystem you want to boot from.
Of course, /unix is able to run required software to support more
advanced filesystem configurations (e.g., my option disk has an XFS
filesytem, mounted at /usr/people, with external logging).
By the way, can I share an xfslog partition with more than one
filesystem? (e.g., an xfslog filesystem shared between /usr, /opt
and /var). Just curious, but it looks useful for the root disk.
Cheers,
Igor.
-- Igor Sobrado, UK34436 - sobrado@acm.org
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