It works for me with RAID5. Maybe RAID6 does not support all of the parity
options. My version of md does not support RAID6, so I can't even try it.
Oh! When I "play" with md and mdadm I use the ram disks. But don't expect
the data to be there after a re-boot! You can fail a drive and hot add and
remove.
Guy
root]# mdadm --create /dev/md3 --chunk=64 --level=5 --raid-devices=4
--parity=right-asymmetric --spare-devices=2 /dev/ram0 /dev/ram1 /dev/ram2
/dev/ram3 /dev/ram4 /dev/ram5
mdadm: array /dev/md3 started.
[root@watkins-home root]# cat /proc/mdstat
Personalities : [raid1] [raid5]
read_ahead 1024 sectors
md3 : active raid5 [dev 01:03][3] [dev 01:05][5] [dev 01:04][4] [dev
01:02][2] [dev 01:01][1] [dev 01:00][0]
12096 blocks level 5, 64k chunk, algorithm 1 [4/4] [UUUU]
-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx
[mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of rich turner
Sent: Thursday, September 23, 2004 1:42 PM
To: linux-raid@xxxxxxxxxxxxxxx
Subject: mdadm create error
i cant figure out what is wrong with the following command. when i
remove the "parity=right-asymmetric" command option it does not fail.
but i need to be able to create the raid device with different parity
algorithms. it also fails on --level=5 and using the short forms of the
flags.
mdadm --create /dev/md2 --chunk=64 --level=6 --raid-devices=4
--parity=right-asymmetric --spare-devices=2 /dev/vg0/turnerlv1
/dev/vg0/turnerlv2 /dev/vg0/turnerlv3 /dev/vg0/turnerlv4
/dev/vg0/turnerlv5 /dev/vg0/turnerlv6
mdadm: layout may only be sent once. Second value was right-asymmetric
rich:/tmp # mdadm --version
mdadm - v1.5.0 - 22 Jan 2004
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