I'm speaking to the method in general and don't know the specifics of bluestore. Recovering from a failed journal in this way is only a good idea if you were able to flush the journal before making a new one. If the journal failed during operation and you couldn't cleanly flush the journal, then the data on the OSD could not be guaranteed and would need to be wiped and started over. The same would go for the block.wal and block.db partitions if you can find the corresponding commands for them.
On Thu, Oct 19, 2017 at 7:44 AM Caspar Smit <casparsmit@xxxxxxxxxxx> wrote:
Hi all,
I'm testing some scenario's with the new Ceph luminous/bluestore combination.
I've created a demo setup with 3 nodes (each has 10 HDD's and 2 SSD's)
So i created 10 BlueStore OSD's with a seperate 20GB block.db on the
SSD's (5 HDD's per block.db SSD).
I'm testing a failure of one of those SSD's (block.db failure).
With filestore i have used the following blog/script to recover from a
journal SSD failure:
http://ceph.com/no-category/ceph-recover-osds-after-ssd-journal-failure/
I tried to adapt the script to bluestore but i couldn't find any
BlueStore equivalent to the following command (where the journal is
re-created):
sudo ceph-osd –mkjournal -i $osd_id
Tracing the 'ceph-disk prepare' command didn't result in a seperate
command that the BlueStore block.db is initialized. It looks like the
--mkfs switch does all the work (including the data part). Am i
correct?
Is there any way a seperate block.db can be initialized after the OSD
was created? In other words: is it possible to recover from a block.db
failure or do i need to start over?
block.db is probably no equivalent to a FileStore's journal, but what
about block.wal? If i use a seperate block.wal device only will the
--mkjournal command re-initialize that or is the --mkjournal command
only used for FileStore ?
Kind regards and thanks in advance for any reply,
Caspar Smit
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