On 11.03.2017 16:25, Nick Fisk wrote:
-----Original Message-----
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of
Laszlo Budai
Sent: 11 March 2017 13:51
To: ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: osd_disk_thread_ioprio_priority help
Hello,
Can someone explain the meaning of osd_disk_thread_ioprio_priority. I'm
reading the definition from this page:
https://access.redhat.com/documentation/en-
us/red_hat_ceph_storage/1.3/html/configuration_guide/osd_configuration_
reference
it says: "It sets the ioprio_set(2) I/O scheduling priority of the disk
thread
ranging from 0 (highest) to 7 (lowest)." What is the so called disk
thread?
Then I found documents using both extreme values (0 and 7) for achieving
the same stuff make the scrubbing low priority.
https://ceph.com/geen-categorie/ceph-reduce-osd-scrub-priority/ and
http://dachary.org/?p=3268 are using the value 7 for reducing the priority
of
scrub, while here: http://ceph-users.ceph.narkive.com/AMMP3r5s/osd-
scrub-sleep-osd-scrub-chunk-min-max and
https://indico.cern.ch/event/588794/contributions/2374222/attachments/13
83112/2103509/Configuring_Ceph.pdf the value 0 is used.
Now I am confused .... :(
Can somebody bring some light here?
Only to confuse you some more. If you are running Jewel or above then
scrubbing is now done in the main operation thread and so setting this value
will have no effect.
There is the hammer version of ceph.
Thank you,
Laszlo
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