Date: Wed, 20 Oct 2004 19:42:33 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: Current <freebsd-current@freebsd.org> Subject: Re: panic: swap_pager_isswapped: failed to locate all swap meta blocks Message-ID: <20041020094233.GC79646@cirb503493.alcatel.com.au> In-Reply-To: <20041018085337.GG73767@darkness.comp.waw.pl> References: <7m7jqjhojv.wl@black.imgsrc.co.jp> <20040924122508.GG9550@darkness.comp.waw.pl> <20040924143224.GG47816@dan.emsphone.com> <20040925095549.GH9550@darkness.comp.waw.pl> <20040925200747.GE83620@cirb503493.alcatel.com.au> <20041018085337.GG73767@darkness.comp.waw.pl>
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On Mon, 2004-Oct-18 10:53:37 +0200, Pawel Jakub Dawidek wrote: >+> As an alternative approach, rather than marking swap clean on a >+> shutdown, why not have a flag in the object's metadata that says "this >+> object doesn't need synchronising on a reboot". If the flag is set, >+> then gmirror just sets both sides as synchronised and active on boot. >+> This is the approach taken by HP Tru64 LSM. (Though one improvement >+> you could make over LSM would be to document the flag). > >Such a flag only makes sense for the whole mirror, not selected components, >right? The flag would be at the volume level. >This doesn't fix the case when one has file systems and swap on the same >mirror, but could be helpful in some cases. This depends on how you build your filesystems. If you create a single vinum volume and use disklabel to partition it, then I agree that marking the whole volume as "no recovery needed" doesn't help. If you have multiple vinum volumes with each filesystem/swap on a distinct volume then a per-volume flag will work. LSM does not support mixing filesystems and swap on a single volume. Vinum allows either approach and it's not particularly clear which is preferable, though there appear to be advantages in avoiding disklabel (and its limitations). -- Peter Jeremy
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