Hi Zhang,
There is no way to resize DB while OSD is running. There is a bit
shorter "unofficial" but risky way than redeploying OSD though. But
you'll need to tag specific OSD out for a while in any case. You will
also need either additional free partition(s) or initial deployment had
to be done using LVMs.
See this blog for morr details.
http://heiterbiswolkig.blogs.nde.ag/2018/04/08/migrating-bluestores-block-db/
And I advise to try such things at non-production cluster first.
Thanks,
Igor
On 7/12/2018 7:03 AM, Shunde Zhang wrote:
Hi Ceph Gurus,
I have installed Ceph Luminous with Bluestore using ceph-ansible.
However, when I did the install, I didn’t set the wal/db size. Then it ended up using the default values, which is quite small: 1G db and 576MB wal.
Note that each OSD node has 12 OSDs and each OSD has a 1.8T spinning disk for data. All 12 OSDs share one NVMe M2 SSD for wal/db.
Now the ceph is in use, and I want to increase the size of db/wal after doing some research: I want to use 20G db and 1G wal. (Are they reasonable numbers?)
I can delete one OSD and then re-create it with ceph-ansible but that is troublesome.
I wonder if there is a (simple) way to increase the size of both db and wal when an OSD is running?
Thanks in advance,
Shunde.
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