Documentation #6379
closedBetter document impact of putting journals on different disks
0%
Description
Questions such as the following are asked frequently on the mailing list and IRC:
- What happens if the journal is lost (the disk on which the journal is written to fails)
- How many OSD journals should you put on another disk
- What kind of performance increase should be expected by putting the journal on another disk
It seems recommended or at least implied that it is better to put the journals on different disks.
We should provide documentation to explain why and what are the possible drawbacks/consequences.
Ref:
http://ceph.com/docs/next/install/hardware-recommendations/#solid-state-drives
http://ceph.com/docs/next/rados/configuration/osd-config-ref/
http://ceph.com/community/ceph-performance-part-2-write-throughput-without-ssd-journals/
http://comments.gmane.org/gmane.comp.file-systems.ceph.user/4267
http://comments.gmane.org/gmane.comp.file-systems.ceph.user/3809
Updated by Zac Dover over 4 years ago
- Status changed from New to Closed
This bug has been judged too old to fix. This is because either it is either
1) raised against a version of Ceph prior to Luminous, or
2) just really old, and untouched for so long that it is unlikely nowadays to represent a live documentation concern.
If you think that the closing of this bug is an error, raise another bug of a similar kind. If you think that the matter requires urgent attention, please let Zac Dover know at zac.dover@gmail.com.