[mythtv-commits] Ticket #10946: Combination Disk Scheduler improperly favors local drive
MythTV
noreply at mythtv.org
Sat Jul 28 05:50:20 UTC 2012
#10946: Combination Disk Scheduler improperly favors local drive
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Reporter: ylee@… | Owner: danielk
Type: Bug Report - | Status: new
General | Milestone: unknown
Priority: minor | Version: 0.24.2
Component: MythTV - Recording | Keywords: disk scheduler
Severity: medium | combination weights
Ticket locked: 0 |
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I have 16 filesystems in Storage Groups for recordings from my five
physical tuners; one filesystem is local to the backend, and the others
are remote and are mounted on the backend by CIFS. I wish to have all 16
filesystems treated equally when mythbackend chooses which one to use,
with the only criteria being 1) free space and 2) whether the filesystem
is being used already. If five recordings begin at once the backend should
select the five filesystems with the most free space. To achieve this, I
chose the Combination disk scheduler (In the above scenario Balanced Free
Space puts all five recordings on the single filesystem with the most free
space), and manually inserted SGweightLocalStarting = 0 to have the
backend treat local and remote filesystems equally.
When I start a single recording, the disk scheduler still favors the local
filesystem even if a remote one has more free space and the calculated
weights for all 16 filesystems are equal. (See the attached mythbackend
log extract with -v none,schedule,file.) My experience matches [http://www
.gossamer-threads.com/lists/mythtv/users/353445#353445 Jon Larson's report
from 2008], back when Combination was the only available setting.
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Ticket URL: <http://code.mythtv.org/trac/ticket/10946>
MythTV <http://code.mythtv.org/trac>
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