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Bug #23819

closed

how to make compactions smooth

Added by yuanli zhu about 6 years ago. Updated over 5 years ago.

Status:
Won't Fix
Priority:
Normal
Assignee:
-
Target version:
-
% Done:

0%

Source:
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
Ceph - v12.2.1
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

when I set db_path into ssd(12 osds db in sdy) ,I found the Speed of reading is too high when the compactions is running,the sdo and sdr (have no ssd to store db data) also to hight when the compactions is running.

!!

My configuration is as follows：
bluestore_block_db_size = 10737418240

I use ceph-disk to create osd:
ceph-disk prepare /dev/sdo --block.db /dev/sdy

My question is, why do I read it at such a high speed? How can I make it smooth?

Files

Download all files
ceph.conf (2.4 KB) ceph.conf the configureation of ceph yuanli zhu, 04/23/2018 03:06 AM
iostat.png (99.8 KB) iostat.png yuanli zhu, 04/23/2018 03:07 AM

Related issues 1 (0 open — 1 closed)

Related to bluestore - Bug #39318: w_await high when rockdb compactingClosed

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 #1

Updated by Sage Weil over 5 years ago

  • Status changed from New to Won't Fix

the compaction is a function of rocksdb and there isn't a lot to be done about it at the moment...

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 #2

Updated by Neha Ojha over 4 years ago

  • Related to Bug #39318: w_await high when rockdb compacting added
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