From: Daniel Schroeter <d.schroeter@gmx.de>
To: linux-kernel@vger.kernel.org
Subject: raid-1 with raid-0 and normal disk -> performance and autostart?
Date: Thu, 01 Feb 2001 11:18:22 +0100 [thread overview]
Message-ID: <3A7937EE.1030104@gmx.de> (raw)
hi,
i using kernel 2.4.1. mkraid version 0.90.0
i build /dev/md0 raid-0 with hda5 and sda1. then i build /dev/md1 raid-1
with /dev/md0 and sdb1.
it works fine.
BUT the resync takes a long time. i have a performance from 253K/sec.
whats there wrong?
[root@mendocino <mailto:root@mendocino> /root]# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid1 md1[1] sdb1[0]
8891712 blocks [2/2] [UU]
[>....................] resync = 0.0% (5572/8891712)
finish=581.8min speed=253K/sec
md1 : active raid0 sda1[1] hda5[0]
8891776 blocks 4k chunks
unused devices: <none>
if i build a raid-1 with sdb1 and hda5 i get:
Personalities : [linear] [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid1 sdb1[1] hda5[0]
4449920 blocks [2/2] [UU]
[>....................] resync = 0.4% (21952/4449920)
finish=10.0min speed=7317K/sec
unused devices: <none>
i get the same speer also with sda1 and sdb1.
any ideas?
i will mount the raid-10 (or 01???) as "/". but the autodetection
doesn't work corect. the partitions are all "Linux raid autodetect". the
raid-0 starts fine. if he tries to start the raid-1 the dev md0 will not
integrated in the array. must i start a ramdisk, and starting there
manuell the raid-1? if i change md1 and md0 it's the same.
THNX
CU
daniel
raidtab:
raiddev /dev/md0
raid-level 0
nr-raid-disks 2
persistent-superblock 1
chunk-size 4
device /dev/hda5
raid-disk 0
device /dev/sda1
raid-disk 1
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
persistent-superblock 1 # i tried also 0 here
chunk-size 4
device /dev/sdb1
raid-disk 0
device /dev/md0
raid-disk 1
-
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next reply other threads:[~2001-02-01 10:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-01 10:18 Daniel Schroeter [this message]
2001-02-05 3:58 ` raid-1 with raid-0 and normal disk -> performance and autostart? Neil Brown
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