Hi,
On 5/21/19 9:46 PM, Robert LeBlanc wrote:
I'm at a new job working with Ceph again and am excited to back in the
community!
I can't find any documentation to support this, so please help me
understand if I got this right.
I've got a Jewel cluster with CephFS and we have an inconsistent PG.
All copies of the object are zero size, but the digest says that it
should be a non-zero size, so it seems that my two options are, delete
the file that the object is part of, or rewrite the object with RADOS
to update the digest. So, this leads to my question, how to I tell
which file the object belongs to.
From what I found, the object is prefixed with the hex value of the
inode and suffixed by the stripe number:
1000d2ba15c.00000005
<inode hex>.<hex stripe number>
I then ran `find . -xdev -inum 1099732590940` and found a file on the
CephFS file system. I just want to make sure that I found the right
file before I start trying recovery options.
The first stripe XYZ.00000000 has some metadata stored as xattr (rados
xattr, not cephfs xattr). One of the entries has the key 'parent':
# ls Ubuntu16.04-WS2016-17.ova
Ubuntu16.04-WS2016-17.ova
# ls -i Ubuntu16.04-WS2016-17.ova
1099751898435 Ubuntu16.04-WS2016-17.ova
# rados -p cephfs_test_data stat 1000e523d43.00000000
cephfs_test_data/1000e523d43.00000000 mtime 2016-10-13 16:20:10.000000,
size 4194304
# rados -p cephfs_test_data listxattr 1000e523d43.00000000
layout
parent
# rados -p cephfs_test_data getxattr 1000e523d43.00000000 parent | strings
Ubuntu16.04-WS2016-17.ova5:
adm2
volumes
The complete path of the file is
/volumes/adm/Ubuntu16.04-WS2016-17.ova5. For a complete check you can
store the content of the parent key and use ceph-dencoder to print its
content:
# rados -p cephfs_test_data getxattr 1000e523d43.00000000 parent >
parent.bin
# ceph-dencoder type inode_backtrace_t import parent.bin decode dump_json
{
"ino": 1099751898435,
"ancestors": [
{
"dirino": 1099527190071,
"dname": "Ubuntu16.04-WS2016-17.ova",
"version": 14901
},
{
"dirino": 1099521974514,
"dname": "adm",
"version": 61190706
},
{
"dirino": 1,
"dname": "volumes",
"version": 48394885
}
],
"pool": 7,
"old_pools": []
}
One important thing to note: ls -i prints the inode id in decimal,
cephfs uses hexadecimal for the rados object names. Thus the different
value in the above commands.
Regards,
Burkhard
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