Locking md device and system for several seconds

["Miro Dietiker, MD Systems" <info@md-systems.ch>]

Hi!

I'm using kernel 2.6.14.2 with md (RAID1 static) as bootable.

While md synching (initial creation or after marked one as failed,
removed and re-added) there are some locking problems with the
complete system/kernel.

Sometimes the system hangs (looks like a file/disk-access-lock)
while other tty's still work (until they access also to the disk).

This "hang" is some seconds (most from 10s up to 1 minute, seldom
more) and surprisedly the system continues working.

If md is in correct state (all partitions synced) this issue
doesn't seem to appear.

Configuration
4 Partitions (/boot 1GB, / 32GB, swap 16GB, /home 250GB) on
MaxLine III SATA 300GB Disks. Each of them (including swap)
is a RAID 1 device in the listed order.
This system has a Opteron 270 with nVidia Professional Chipset.

There are NO log entries found anywhere and no console warning/error.

These are 4 systems with she same behaviour.

Did anybody ever reported such an issue or has an idea?

Miro Dietiker

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