Hi Weiwen,
Thanks for the reference link. That does indeed indicate the opposite.
I'm not sure why our issues became much less when the big files were
deleted. I suppose it's just that there was more space available after
deleting the big files.
-Dave
On 2022-08-30 11:56 a.m., 胡 玮文 wrote:
[△EXTERNAL]
在 2022年8月30日，23:20，Dave Schulz <[email protected]> 写道：
Is a file in ceph assigned to a specific PG? In my case it seems
like a file that's close to the size of a single OSD gets moved from
one OSD to the next filling it up and domino-ing around the cluster
filling up OSDs.
I believe no. Each large file is split into multiple objects, 4MB each
by default. These objects are evenly assigned to all PGs in the pool.
https://docs.ceph.com/en/quincy/cephfs/file-layouts/
<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.ceph.com%2Fen%2Fquincy%2Fcephfs%2Ffile-layouts%2F&data=05%7C01%7Cdschulz%40ucalgary.ca%7C2de770fd2bda4af4012708da8ab0f5b8%7Cc609a0eca5e346319686192280bd9151%7C1%7C0%7C637974790346533261%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=cY0UfMKts0cy8xXj37u8gIbbp5xeyfQQFAJ%2Bo5GKN1o%3D&reserved=0>
Weiwen Hu
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