Ceph: The value of "ctime" changes between original and snapshot volume, (CephFS).
Issue
The value of ctime
changes between original and snapshot volume, (CephFS).
For a CephFS Snapshot, the value of ctime
differs for the same file from the mounted source volume
Example:
Original CephFS Volume:
sh-4.4$ stat /var/storage/test1/filepvc1
File: /var/storage/test1/filepvc1
Size: 0 Blocks: 0 IO Block: 4194304 regular empty file
Device: 2000cbh/2097355d Inode: 1099511627795 Links: 1
Access: (0666/-rw-rw-rw-) Uid: (1000640000/1000640000) Gid: ( 0/ root)
Access: 2023-10-09 20:00:41.154873800 +0000
Modify: 2023-10-09 20:00:41.154873800 +0000
Change: 2023-10-09 20:00:41.154873800 +0000 (ctime)
Birth: 2023-10-09 20:00:41.150873783 +0000
Snapshot of volume above:
sh-4.4$ stat /var/restored-snapshot/test2/filepvc1
File: /var/restored-snapshot/test2/filepvc1
Size: 0 Blocks: 0 IO Block: 4194304 regular empty file
Device: 2000deh/2097374d Inode: 1099511628802 Links: 1
Access: (0666/-rw-rw-rw-) Uid: (1000640000/1000640000) Gid: ( 0/ root)
Access: 2023-10-09 20:00:41.000000000 +0000
Modify: 2023-10-09 20:00:41.000000000 +0000
Change: 2023-10-09 20:10:11.841387231 +0000 (ctime)
Birth: 2023-10-09 20:05:38.952062696 +0000
Environment
Red Hat OpenShift Container Platform (OCP) 4.x
Red Hat OpenShift Container Storage (OCS) 4.x
Red Hat OpenShift Data Foundation (ODF) 4.x
Red Hat Ceph Storage (RHCS) 5.x
Red Hat Ceph Storage (RHCS) 6.x
Ceph File System (CephFS)
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