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    SubjectRaid5 resync slow with one linear array

    I just setup a 4 (5 really) drive raid5 array.

    It is syncing up right now and nothing else is running on the system.

    I have three 18GB SCA scsi drives and 2x9GB linear array in a four "drive"
    raid5 array.

    Unfortunately, it is syncing up quite slowly. Only about 2MB/sec on a
    40MB/sec array. The system is idle.


    Is there something about this config that says "Don't do that!"? I've
    heard about RAID10, but not Linear+RAID5...

    This way, I get more space, and one filesystem (except a 50mb raid1 for



    Personalities : [linear] [raid0] [raid1] [raid5]
    read_ahead 1024 sectors
    md2 : active raid1 scsi/host0/bus0/target1/lun0/part1[1] scsi/host0/bus0/target0/lun0/part1[0]
    48064 blocks [2/2] [UU]

    md1 : active linear scsi/host0/bus0/target0/lun0/part2[1] scsi/host0/bus0/target1/lun0/part2[0]
    17671296 blocks 32k rounding

    md0 : active raid5 md/1[4] scsi/host0/bus0/target4/lun0/part2[2] scsi/host0/bus0/target3/lun0/part2[1] scsi/host0/bus0/target2/lun0/part2[0]
    52990080 blocks level 5, 32k chunk, algorithm 2 [4/3] [UUU_]
    [>....................] recovery = 2.1% (373984/17663360) finish=143.2min speed=2010K/sec
    unused devices: <none>
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