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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?
Finally, I've founded the command:
ceph daemon osd.1 perf dump | grep bluestore
And there you have compressed data
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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