Hi all
I'm testing a recovery scenario for a NAS server which uses an SSD as
a PV for the LVM cache (dm-cache).
When I remove the SSD and try to uncache the LV I get this:
[root@storage ~]# lvconvert -v --force --uncache /dev/total_storage/test
WARNING: Device for PV yJvPgB-aPlc-wFG2-DL9U-MOKI-2F93-XlzHyf not
found or rejected by a filter.
There are 1 physical volumes missing.
Cannot change VG total_storage while PVs are missing.
Consider vgreduce --removemissing.
There are 1 physical volumes missing.
[root@storage ~]# vgreduce -v --force --removemissing total_storage
Finding volume group "total_storage"
WARNING: Device for PV yJvPgB-aPlc-wFG2-DL9U-MOKI-2F93-XlzHyf not
found or rejected by a filter.
There are 1 physical volumes missing.
There are 1 physical volumes missing.
Trying to open VG total_storage for recovery...
WARNING: Device for PV yJvPgB-aPlc-wFG2-DL9U-MOKI-2F93-XlzHyf not
found or rejected by a filter.
There are 1 physical volumes missing.
There are 1 physical volumes missing.
Archiving volume group "total_storage" metadata (seqno 9).
Removing partial LV test.
activation/volume_list configuration setting not defined: Checking
only host tags for total_storage/test
Executing: /usr/sbin/modprobe dm-cache
Creating total_storage-cache_pool00_cdata-missing_0_0
Loading total_storage-cache_pool00_cdata-missing_0_0 table (253:3)
Resuming total_storage-cache_pool00_cdata-missing_0_0 (253:3)
Creating total_storage-cache_pool00_cdata
Loading total_storage-cache_pool00_cdata table (253:4)
Resuming total_storage-cache_pool00_cdata (253:4)
Creating total_storage-cache_pool00_cmeta-missing_0_0
Loading total_storage-cache_pool00_cmeta-missing_0_0 table (253:5)
Resuming total_storage-cache_pool00_cmeta-missing_0_0 (253:5)
Creating total_storage-cache_pool00_cmeta
Loading total_storage-cache_pool00_cmeta table (253:6)
Resuming total_storage-cache_pool00_cmeta (253:6)
Creating total_storage-test_corig
Loading total_storage-test_corig table (253:7)
Resuming total_storage-test_corig (253:7)
Executing: /usr/sbin/cache_check -q
/dev/mapper/total_storage-cache_pool00_cmeta
vgreduce gets stuck at the last step: /usr/sbin/cache_check
If I run cache_check manually I get this:
[root@storage ~]# /usr/sbin/cache_check
/dev/mapper/total_storage-cache_pool00_cmeta
examining superblock
superblock is corrupt
incomplete io for block 0, e.res = 18446744073709551611, e.res2 =
0, offset = 0, nbytes = 4096
and it waits indefinitely.
If a replace the /usr/sbin/cache_check with a shell script that returns 0 or 1
vgreduce just errors out. It seems that there is no way to uncache the
LV without
replacing the missing PV (which could pose a problem in production use).
The origin LV (test_corig) is fine, I can mount it and use it, there
are no file-system issues etc.
Is this an intended behaviour or a bug?
This is on centos 7, kernel-3.10.0-229.11.1.el7.x86_64,
lvdisplay --version :
LVM version: 2.02.115(2)-RHEL7 (2015-01-28)
Library version: 1.02.93-RHEL7 (2015-01-28)
Driver version: 4.29.0
Thanks
Dragan
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