Hi there,
We have a RHEL5.5 server (fully patched, most recent kernel) upon which
we've just moved to multipathing with Emulex FC cards. All the multipathing
is set up and working (multipath service running, /etc/multipath.conf
configured correctly). However, on boot we see lots of these:
sdb:end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0
Buffer I/O error on device sdb, logical block 1
Buffer I/O error on device sdb, logical block 2
Buffer I/O error on device sdb, logical block 3
Buffer I/O error on device sdb, logical block 4
Buffer I/O error on device sdb, logical block 5
Buffer I/O error on device sdb, logical block 6
Buffer I/O error on device sdb, logical block 7
when booting as the scsi_dh_rdac module isn't loaded until later in the boot
process. A bit of digging has turned up the instructions to rebuild the
initrd with scsi_dh_rdac preloaded:
mkinitrd -f -v /boot/initrd-$(uname -r).img $(uname -r) --allow-missing
--preload scsi_dh_rdac
or
mkinitrd -f /boot/initrd-$(uname -r).img $(uname -r) --preload=scsi_dh_rdac
or even
mkinitrd -v --preload=scsi_dh_rdac --with=dm-rdac -f /boot/initrd-$(uname
-r)-multipath.img $(uname -r)
to ensure that this kind of thing stops happening.
My question is therefore twofold:
1) Which one of these mkinitrd commands is 'most correct', and
2) Will I have to do this after every kernel update or can I put something
into /etc/sysconfig/mkinitrd/ which will be picked up when the kernel RPM
is installed and rebuild the initrd for me automagically?
Thank you,
Ben
--
Unix Support, MISD, University of Cambridge, England
Plugger of wire, typer of keyboard, imparter of Clue
Life Is Short. It's All Good.
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