Hi RHEL/CentOS users,
This is just a heads up that we observe slow requests during the RHEL6.6 upgrade. The upgrade includes selinux-policy-targeted, which runs this during the update:
/sbin/restorecon -i -f - -R -p -e /sys -e /proc -e /dev -e /mnt -e /var/tmp -e /home -e /tmp -e /dev
restorecon is scanning every single file on the OSDs, e.g. from strace:
...
lstat("rbd\\udata.1b9d8d42be29bd3.000000000003e430__head_052DF076__4", {st_mode=S_IFREG|0644, st_size=4194304, ...}) = 0
lstat("rbd\\udata.1c2064583a15ea.00000000000a8553__head_4B4DF076__4", {st_mode=S_IFREG|0644, st_size=4194304, ...}) = 0
lstat("rbd\\udata.1c20d893e777ea0.000000000007ee23__head_2FDDF076__4", {st_mode=S_IFREG|0644, st_size=4194304, ...}) = 0
lstat("rbd\\udata.1e02d691ddaefb.000000000000437c__head_1FADF076__4", {st_mode=S_IFREG|0644, st_size=4194304, ...}) = 0
...
and it is using a default (be/4) io priority:
65567 be/4 root 768.61 K/s 0.00 B/s 0.00 % 0.00 % restorecon -i -f - -R -p -e /sys -e /proc -e /dev -e /mnt -e /var/tmp -e /home -e /tmp -e /dev
I’m going to submit a ticket about this in case our RedHat friends want to follow up.
Cheers, Dan
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