[ceph-users] Bluestore osd_max_backfills

Wido den Hollander wido at 42on.com
Tue Nov 7 23:19:51 PST 2017


> Op 7 november 2017 om 22:54 schreef Scottix <scottix at gmail.com>:
> 
> 
> Hey,
> I recently updated to luminous and started deploying bluestore osd nodes. I
> normally set osd_max_backfills = 1 and then ramp up as time progresses.
> 
> Although with bluestore it seems like I wasn't able to do this on the fly
> like I used to with XFS.
> 
> ceph tell osd.* injectargs '--osd-max-backfills 5'
> 
> osd.34: osd_max_backfills = '5'
> osd.35: osd_max_backfills = '5' rocksdb_separate_wal_dir = 'false' (not
> observed, change may require restart)
> osd.36: osd_max_backfills = '5'
> osd.37: osd_max_backfills = '5'
> 
> As I incorporate more bluestore osds not being able to control this is
> going to drastically affect recovery speed and with the default as 1, on a
> big rebalance, I would be afraid restarting a bunch of osd.
> 

Are you sure the backfills are really not increasing? If you re-run the command, what does it output?

I've seen this as well, but the backfills seemed to increase anyway.

Wido

> Any advice in how to control this better?
> 
> Thanks,
> Scott
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