Hi David,
First of all 'bluestore_extent_compress' is unrelated to data
compression - that's amount of merged onode's extent map entries.
When BlueStore detects neighboring extents in an onode - it might merge
them into a single map entry, e.g.
write 0x4000~1000
...
<other sparse writes>
...
write 0x5000~2000
can be merged in a single extent entry in the corresponding extent map:
...
0x4000~3000
...
Hence please ignore this parameter for your task.
Other parameters show that most probably no compression were applied.
But could you please share all the counters from "bluestore" section?
Also for easier analysis it would be nice to have some OSD log extract
(with 'debug bluestore = 20') containing writes supposed to be compressed.
Thanks,
Igor
On 6/26/2018 4:53 PM, David Turner wrote:
ceph daemon osd.1 perf dump | grep bluestore | grep compress
"bluestore_compressed": 0,
"bluestore_compressed_allocated": 0,
"bluestore_compressed_original": 0,
"bluestore_extent_compress": 35372,
I filled up an RBD in a compressed pool (aggressive) in my test
cluster with 1TB of zeros. The bluestore OSDs in the cluster all show
similar to this. Am I missing something here? Is there any other
method to determining compression ratios?
On Tue, Dec 5, 2017 at 1:25 AM Rafał Wądołowski
<rwadolow...@cloudferro.com <mailto:rwadolow...@cloudferro.com>> wrote:
Finally, I've founded the command:
ceph daemon osd.1 perf dump | grep bluestore
And there you have compressed data
Regards,
Rafał Wądołowski
http://cloudferro.com/ <http://cloudferro.com/>
On 04.12.2017 14:17, Rafał Wądołowski wrote:
Hi,
Is there any command or tool to show effectiveness of bluestore
compression?
I see the difference (in ceph osd df tree), while uploading a
object to ceph, but maybe there are more friendly method to do it.
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