From: Sergey Vlasov <vsu@altlinux.ru>
To: devel@lists.altlinux.org
Subject: Re: [devel] U: Работает ли автостарт softraid в XEN?
Date: Wed, 24 Oct 2007 00:30:25 +0400
Message-ID: <20071023203025.GB5077@procyon.home> (raw)
In-Reply-To: <471E4B65.6050006@solin.spb.ru>
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On Tue, Oct 23, 2007 at 11:28:37PM +0400, Aleksey Avdeev wrote:
> Именно таким хаком (копированием в initrd mdassemble и системного
> /etc/mdadm.conf) я эту проблему и решил... Но ненравиться мне такое
> решение! :-(
>
> По ходу дела выползло (незнаю, на сколько с данным способом решения
> связанное):
>
> 1. Неполучилось смонтировать root по UUID -- параметр root=UUID=<UUID,
> скопированный из lilo.conf> оказался нерабочим: зажило только с
> root=/dev/md<нужный>
Если это /dev/md0, вероятнее всего, это тот же race, для которого
сделан hackaround в текущей реализации:
# /scripts/local-top runs before swsusp resume - start RAID in
# read-only mode to avoid messing up resume state. Actually the
# start_ro parameter sets the "read-auto" mode - arrays initially
# start read-only, but are switched to the normal read-write mode on
# the first write request, so there is no need to switch arrays to
# the read-write mode explicitly.
#
# "echo add > /sys/block/md0/uevent" after md_run is a workaround for
# an unavoidable race between md_run invoking RAID_AUTORUN ioctl on
# /dev/md0 and udevd probing the started md devices (one of which may
# be /dev/md0): probing fails if it starts when md_run still has
# /dev/md0 open. The extra uevent makes sure that /dev/md0 is probed
# properly, which is important when the root fs is specified by UUID.
cat >>"$MNTDIR"/scripts/local-top <<'EOF'
log_begin_msg "Starting up RAID devices"
modprobe -q md_mod
echo 1 > /sys/module/md_mod/parameters/start_ro
md_run `cat /proc/cmdline`
echo add > /sys/block/md0/uevent ||:
log_end_msg
EOF
Т.е., после md_run (или mdassemble) нужно лишний раз дёрнуть
/sys/block/md0/uevent, чтобы для него прочитался uuid. Хотя,
возможно, для mdassemble этого будет мало.
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next prev parent reply other threads:[~2007-10-23 20:30 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-23 12:46 Aleksey Avdeev
2007-10-23 19:25 ` Sergey Vlasov
2007-10-23 19:28 ` Aleksey Avdeev
2007-10-23 19:51 ` Peter V. Saveliev
2007-10-24 5:15 ` [devel] U: Работаея┌ п╩п╦ п╟п╡я┌п╬я│я┌п╟я─я┌ softraid п╡ XEN? Aleksey Avdeev
2007-10-23 20:30 ` Sergey Vlasov [this message]
2007-10-24 5:12 ` [devel] U: Работает ли автостарт softraid в XEN? Aleksey Avdeev
2007-10-25 17:12 ` Sergey Vlasov
2007-10-25 18:12 ` Михаил Якушин
2007-10-25 15:46 ` Aleksey Avdeev
2007-10-25 16:01 ` Aleksey Avdeev
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