Re: OSD Memory usage

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Hi Seena,

just to note  - this ticket might be relevant.

https://tracker.ceph.com/issues/48276


Mind leaving a comment there?


Thanks,

Igor

On 11/23/2020 2:51 AM, Seena Fallah wrote:
Now one of my OSDs gets segfault.
Here is the full trace: https://paste.ubuntu.com/p/4KHcCG9YQx/

On Mon, Nov 23, 2020 at 2:16 AM Seena Fallah <seenafallah@xxxxxxxxx> wrote:

Hi all,

After I upgrade from 14.2.9 to 14.2.14 my OSDs are using less more memory
than before! I give each OSD 6GB memory target and before the free memory
was 20GB and now after 24h from the upgrade I have 104GB free memory of
128GB memory! Also, my OSD latency got increases!
This happens in both SSD and HDD tier.

Are there any notes from the upgrade I missed? Is it related to
bluefs_buffered_io?
If BlueFS do a direct IO shouldn't BlueFS/Bluestore use the targeted
memory for its cache and does it mean before the upgrade the memory used
was by a kernel that buffers the IO and wasn't for the ceph-osd?

Thanks.

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