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[linux-lvm] LVM incredible slow with Kernel 2.6.11



I have built yesterday a 2.6.11 kernel with Xen.
I wanted to move some old data to my LVM and the speed according to
midnight commander was about 350kb/s ! about 2gig where copied in 4
hours! I then rebooted with the original Debian Kernel 2.4.27-2-386 and
the speed incresead to about 5mb/s that doesn't make me very happy
either but was way better then 350kb!
I have been searching the net all night and didn't come up with a
solution. I have no clue what is wrong here.
What did I do wrong and how can I increase the performance?

The lvm is made out of 2x Seagate 300GB IDE HD not striped.

esplendidos:~# lvm lvdisplay
  --- Logical volume ---
  LV Name                /dev/share/sharevg
  VG Name                share
  LV UUID                KdvcJ9-ZLMP-AJYA-soGK-qHfy-UtrX-PpV9Kv
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                558.91 GB
  Current LE             143082
  Segments               2
  Allocation             inherit
  Read ahead sectors     0
  Block device           254:0

esplendidos:~# lvm dumpconfig
devices {
        dir="/dev"
        scan="/dev"
        filter="r|/dev/cdrom|"
        cache="/etc/lvm/.cache"
        write_cache_state=1
        sysfs_scan=1
        md_component_detection=0
}
activation {
        missing_stripe_filler="/dev/ioerror"
        mirror_region_size=512
        reserved_stack=256
        reserved_memory=8192
        process_priority=-18
}
global {
        umask=63
        test=0
        activation=1
        proc="/proc"
        locking_type=1
        locking_dir="/var/lock/lvm"
}
shell {
        history_size=100
}
backup {
        backup=1
        backup_dir="/etc/lvm/backup"
        archive=1
        archive_dir="/etc/lvm/archive"
        retain_min=10
        retain_days=30
}
log {
        verbose=0
        syslog=1
        overwrite=0
        level=0
        indent=1
        command_names=0
        prefix="  "
}

any tip for performance tuning?

--
Cristian Livadaru
http://vwclub.ro/


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