raid-1 with raid-0 and normal disk -> performance and autostart?

From: Daniel Schroeter (
Date: Thu Feb 01 2001 - 05:18:22 EST

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.



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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This archive was generated by hypermail 2b29 : Wed Feb 07 2001 - 21:00:12 EST