Re: Data distribution question

[Kenneth Van Alstyne <kvanalstyne@xxxxxxxxxxxxxxx>]

Shain:

Have you looked into doing a "ceph osd reweight-by-utilization” by chance?  I’ve found that data distribution is rarely perfect and on aging clusters, I always have to do this periodically.

Thanks,

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Kenneth Van Alstyne
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On Apr 30, 2019, at 11:34 AM, Shain Miley <smiley@xxxxxxx> wrote:

Hi,

We have a cluster with 235 osd's running version 12.2.11 with a combination of 4 and 6 TB drives.  The data distribution across osd's varies from 52% to 94%.

I have been trying to figure out how to get this a bit more balanced as we are running into 'backfillfull' issues on a regular basis.

I've tried adding more pgs...but this did not seem to do much in terms of the imbalance.

Here is the end output from 'ceph osd df':

MIN/MAX VAR: 0.73/1.31  STDDEV: 7.73

We have 8199 pgs total with 6775 of them in the pool that has 97% of the data.

The other pools are not really used (data, metadata, .rgw.root, .rgw.control, etc).  I have thought about deleting those unused pools so that most if not all the pgs are being used by the pool with the majority of the data.

However...before I do that...there anything else I can do or try in order to see if I can balance out the data more uniformly?

Thanks in advance,

Shain

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NPR | Shain Miley | Manager of Infrastructure, Digital Media | smiley@xxxxxxx | 202.513.3649

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