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Titre
Linux - Backup Failure - Backup fails on Linux machine with multipath enabled -
Description
When taking an AppAssure for Linux base image/snapshot, while having multipath enabled, you may encounter the following error:
"bsctl encountered an error when processing command '--complete-snapshot /dev/sdb1 '. Error: bsctl: ERROR: device /dev/sdb1 is busy, please try again later" -
Cause
This can happen because the AppAssure snapshot device is being queried by the multipath daemon and is unable to complete the snapshot process because multipath has a handle on the device. This causes the AppAssure snapshot to fail.
The AppAssure snapshot device is a device that AppAssure creates to mirror the data on disk, while taking a snapshot. You can see a list of snapshot devices, which are only available during the snapshot, by running the following command (The snapshot device would be /dev/sbd0 and /dev/sbd1. ):
bsctl -l
Example Output:
Filesystem Device Snapshot Dirty Bitmap Data/dev/sdb1 sdb sbd0 Yes No Yes/dev/sdb3 sdb sbd1 Yes No Yes -
Résolution
To fix this issue, you can modify the multipath configuration file to blacklist the AppAssure snapshot devices, which will always start with sbd* .
1. Edit the multipath configuration file:
vi /etc/multipath.conf
2. Add to the blacklist section or create it if it does not already exist:
# Ignore local drivesblacklist {devnode "^sbd"}3. Restart the multipath daemon. (There can be multiple ways to do this)service multipathd restart