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Binary package hint: udev
udevd constantly changes LUN device node symlinks (devices/LUNs, not the
partition nodes) in /dev/disk/by-id. udevd uses ~15% of CPU and system
time is using ~50-60%.
For example:
[...@syslog01.roch.ny:pts/0 /dev/disk/by-id> ls -l
wwn-0x60a98000486e5339576f596675735354 wwn-0x60a98000486e5339576f596675744c36
scsi-360a98000486e5339576f596675735354 scsi-360a98000486e5339576f596675744c36;
sleep 1; echo '======'; ls -l wwn-0x60a98000486e5339576f596675735354
wwn-0x60a98000486e5339576f596675744c36 scsi-360a98000486e5339576f596675735354
scsi-360a98000486e5339576f596675744c36
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
scsi-360a98000486e5339576f596675735354 -> ../../sde
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
scsi-360a98000486e5339576f596675744c36 -> ../../sdf
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
wwn-0x60a98000486e5339576f596675735354 -> ../../sde
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
wwn-0x60a98000486e5339576f596675744c36 -> ../../sdf
======
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
scsi-360a98000486e5339576f596675735354 -> ../../sdg
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
scsi-360a98000486e5339576f596675744c36 -> ../../sdh
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
wwn-0x60a98000486e5339576f596675735354 -> ../../sdg
lrwxrwxrwx 1 root root 9 2010-09-21 16:12
wwn-0x60a98000486e5339576f596675744c36 -> ../../sdh
All other device nodes stay the same, such as the device nodes for the
partitions:
[...@syslog01.roch.ny:pts/0 /dev/disk/by-id> ls -l
scsi-360a98000486e5339576f596675735354-part1; sleep 1; echo '======'; ls -l
scsi-360a98000486e5339576f596675735354-part1
lrwxrwxrwx 1 root root 10 2010-09-21 15:47
scsi-360a98000486e5339576f596675735354-part1 -> ../../sdg1
======
lrwxrwxrwx 1 root root 10 2010-09-21 15:47
scsi-360a98000486e5339576f596675735354-part1 -> ../../sdg1
I'm not entirely sure whether this is udev's problem or something related to
multipathing. Our most recent experience with multipathing is the last LTS
release (hardy), which doesn't exhibit this behavior given similar
configurations.
[...@syslog01.roch.ny:pts/0 ~> sudo multipath -ll
rootvol (360a98000486e5339576f596675735354) dm-1 NETAPP ,LUN
[size=36G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=8][active]
\_ 2:0:2:0 sda 8:0 [active][ready]
\_ 3:0:2:0 sde 8:64 [active][ready]
\_ round-robin 0 [prio=2][enabled]
\_ 3:0:3:0 sdg 8:96 [active][ready]
\_ 2:0:3:0 sdc 8:32 [active][ready]
syslog-data (360a98000486e5339576f596675744c36) dm-0 NETAPP ,LUN
[size=1.0T][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=8][active]
\_ 2:0:2:1 sdb 8:16 [active][ready]
\_ 3:0:2:1 sdf 8:80 [active][ready]
\_ round-robin 0 [prio=2][enabled]
\_ 3:0:3:1 sdh 8:112 [active][ready]
\_ 2:0:3:1 sdd 8:48 [active][ready]
[...@syslog01.roch.ny:pts/0 ~> cat /etc/multipath.conf
multipaths {
multipath {
wwid 360a98000486e5339576f596675735354
alias rootvol
}
multipath {
wwid 360a98000486e5339576f596675744c36
alias syslog-data
}
}
devices {
device {
vendor "NETAPP "
product "LUN "
path_checker tur
path_grouping_policy group_by_prio
prio_callout "/sbin/mpath_prio_netapp /dev/%n"
failback immediate
rr_min_io 128
no_path_retry queue
}
}
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Status: New
--
constantly changes /dev/disk/by-id/{scsi,wwn}-* LUN symlinks with multipathing
https://bugs.launchpad.net/bugs/644489
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