Chapter 4. Known Issues
292
To work around this, delete all device and
mpath
link entries in
/etc/lvm/.cache
specific to the
stale LUN.
To find out what these entries are, run the following command:
ls -l /dev/mpath | grep
[stale LUN]
For example, if
[stale LUN]
is 3600d0230003414f30000203a7bc41a00, the following results may
appear:
lrwxrwxrwx 1 root root 7 Aug 2 10:33 /3600d0230003414f30000203a7bc41a00 -> ../dm-4
lrwxrwxrwx 1 root root 7 Aug 2 10:33 /3600d0230003414f30000203a7bc41a00p1 -> ../dm-5
This means that 3600d0230003414f30000203a7bc41a00 is mapped to two
mpath
links:
dm-4
and
dm-5
.
As such, the following lines should be deleted from
/etc/lvm/.cache
:
/dev/dm-4
/dev/dm-5
/dev/mapper/3600d0230003414f30000203a7bc41a00
/dev/mapper/3600d0230003414f30000203a7bc41a00p1
/dev/mpath/3600d0230003414f30000203a7bc41a00
/dev/mpath/3600d0230003414f30000203a7bc41a00p1
(BZ#238421)
20
• Running the
multipath
command with the
-ll
option can cause the command to hang if one of
the paths is on a blocking device. Note that the driver does not fail a request after some time if the
device does not respond.
This is caused by the cleanup code, which waits until the path checker request either completes or
fails. To display the current
multipath
state without hanging the command, use
multipath -l
instead.
(BZ#214838)
21
4.5. dmraid
The dmraid packages contain the ATARAID/DDF1 activation tool that supports RAID device discovery,
RAID set activation, and displays properties for ATARAID/DDF1 formatted RAID sets on Linux kernels
using device-mapper.
• The
/etc/cron.d/dmeventd-logwatch
crontab file does not specify the user that the logwatch
process should be executed by. To work around this issue, the functional portion of this crontab
must be changed to:
* * * * * root /usr/sbin/logwatch --service dmeventd --range today --detail med
(BZ#516892)
22
• The installation procedure stores the name of RAID volume and partition in an initscript. When the
system boots, dmraid enables the RAID partition (that are named implicitly in the init script. This
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