On Tue, Jul 27, 2021 at 10:02 AM Manuel Holtgrewe <zyklenfrei@xxxxxxxxx> wrote:
>
> Dear all,
>
> I'm running Ceph 14.2.11. I have one cephfs file system and it used to
> store all data on a pool called cephfs_data. I moved all data to a pool
> called hdd_ec (which uses erasure coding which I prefer) with an
> copy-file-delete-rename approach. I ended up with ~10TB of data on the
> cephfs_data pool.
>
> I now try to locate the files that are still in the old pool. Here is what
> *should* work according to what I found online:
There will always be at least one object per file in the default data
pool for storing backtraces.
> First I list the objects in the cephfs_data pool.
>
> # rados -p cephfs_data ls | head
> 100096fa552.00000000
> 1000b15ae43.00000000
> 1000b595619.00000000
> 1000b59f060.00000000
> 1000b1966b7.00000000
> 1000b06a749.00000000
> 1000b3e1ccd.00000000
> 1000b56d512.00000000
> 1000b67b76a.00000000
> 1000b32629a.00000000
You can try grepping for 000000001 to find files that have at least two objects.
> Then I try to get an omap key ... but this fails.
In CephFS, data pools do not use omap.
If you want the backtrace of a file, you can do something like this:
# rados --pool cephfs.teuthology.data getxattr 10014bb9b3a.00000000
parent | ceph-dencoder type inode_backtrace_t import - decode
dump_json
{
"ino": 1099859467066,
"ancestors": [
{
"dirino": 1099859454351,
"dname": "ceph-client.admin.27659.log.gz",
"version": 36178
},
{
"dirino": 1099859453575,
"dname": "log",
"version": 145720
},
{
"dirino": 1099859453570,
"dname": "smithi157",
"version": 252
},
{
"dirino": 1099859431752,
"dname": "remote",
"version": 803
},
{
"dirino": 1099859111936,
"dname": "6275606",
"version": 132338
},
{
"dirino": 1099511627776,
"dname":
"teuthology-2021-07-16_05:17:03-krbd-pacific-testing-basic-smithi",
"version": 21141934
},
{
"dirino": 1,
"dname": "teuthology-archive",
"version": 56333879
}
],
"pool": 119,
"old_pools": [
114
]
}
--
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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