From: Carl-Daniel Hailfinger <c-d.hailfinger.kernel.2004@gmx.net>
To: Linux RAID Mailing List <linux-raid@vger.kernel.org>
Subject: mdadm problems with partitioned md devices
Date: Tue, 23 Nov 2004 21:06:30 +0100 [thread overview]
Message-ID: <41A39846.9070002@gmx.net> (raw)
Hi,
[please CC: me]
while trying to use md to overcome limitations of dm, I
stumbled upon the following problem: It is impossible to
have more than 4 partitioned md devices since mdadm will
create the 5th device with major:minor 255:0, which is
bogus.
Way to reproduce the problem:
linux:~ # mdadm --stop --scan
linux:~ # rm /dev/md_d*
linux:~ # sync
linux:~ # mdadm -B /dev/md_d0 -f -l linear -n 1 -ap63 /dev/hdb5
mdadm: array /dev/md_d0 built and started.
linux:~ # mdadm -B /dev/md_d1 -f -l linear -n 1 -ap63 /dev/hdb6
mdadm: array /dev/md_d1 built and started.
linux:~ # mdadm -B /dev/md_d2 -f -l linear -n 1 -ap63 /dev/hdb7
mdadm: array /dev/md_d2 built and started.
linux:~ # mdadm -B /dev/md_d3 -f -l linear -n 1 -ap63 /dev/hdb8
mdadm: array /dev/md_d3 built and started.
linux:~ # mdadm -B /dev/md_d4 -f -l linear -n 1 -ap63 /dev/hdb9
mdadm: error opening /dev/md_d4: No such device or address
linux:~ # mdadm --version
mdadm - v1.8.1 - 05 November 2004
linux:~ # uname -a
Linux linux 2.6.10-rc2suseconfig #5 Tue Nov 23 14:12:13 CET 2004 i686 i686 i386 GNU/Linux
linux:~ #
Regards,
Carl-Daniel
--
http://www.hailfinger.org/
next reply other threads:[~2004-11-23 20:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-23 20:06 Carl-Daniel Hailfinger [this message]
2004-11-23 23:17 ` mdadm problems with partitioned md devices Neil Brown
2004-11-24 2:32 ` Carl-Daniel Hailfinger
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