LVM snapshot changed state to Invalid and should be removed

This document (000019858) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 12

Situation

LVM snapshots have been created and are full, they are no longer accessible and are generating errors in the system logs.
Errors seen in messages logs:

kernel: Buffer I/O error on dev dm-X, logical block X, async page read

lvm[3036]: Monitoring snapshot osvolgrp-rootsnapshot.
lvm[3036]: WARNING: Snapshot osvolgrp-rootsnapshot is now 80.48% full.
lvm[3036]: WARNING: Snapshot osvolgrp-rootsnapshot is now 85.11% full.
lvm[3036]: WARNING: Snapshot osvolgrp-rootsnapshot is now 94.02% full.
lvm[3036]: WARNING: Snapshot osvolgrp-rootsnapshot is now 95.08% full.

kernel: [ 8406.332418] device-mapper: snapshots: Invalidating snapshot: Unable to allocate exception.

lvm[3036]: WARNING: Snapshot osvolgrp-rootsnapshot changed state to: Invalid and should be removed.

lvm[3036]: No longer monitoring snapshot osvolgrp-rootsnapshot.

Also the state seen with the "lvs" command shows an "I" in the Attribute column for "Invalid":

lvs
LV        VG          Attr          LSize  Pool  Origin   Data%  
rootsnapshot osvolgrp swi-I-s---  2.00g          rootlv    100.00
rootlv      osvolgrp   owi-aos--- 36.00g

Resolution

Once the snapshot is full it cannot be used and must be removed.
"When the snapshot is full, it is disabled, which prevents you from remounting the source logical volume."

Remove the LV snapshot with:

lvremove VOLUME_GROUP/SNAPSHOT_VOLUME
lvremove SNAPSHOT_VOLUME_PATH

Examples:

lvremove osvolgrp/rootsnapshot

lvremove /dev/osvolgrp/rootsnapshot

Additional Information

In addition the "snapshot_autoextend_threshold" can be used to automatically extend the snapshot as the source volume grows.
By default, this is disabled on SLES.

From /etc/lvm/lvm.conf

# Configuration option activation/snapshot_autoextend_threshold.
# Auto-extend a snapshot when its usage exceeds this percent.
# Setting this to 100 disables automatic extension.
# The minimum value is 50 (a smaller value is treated as 50.)
# Also see snapshot_autoextend_percent.
# Automatic extension requires dmeventd to be monitoring the LV.

# Example
# Using 70% autoextend threshold and 20% autoextend size, when a 1G
# snapshot exceeds 700M, it is extended to 1.2G, and when it exceeds
# 840M, it is extended to 1.44G:
# snapshot_autoextend_threshold = 70
#
snapshot_autoextend_threshold = 100

Disclaimer

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Document ID:000019858
Creation Date: 03-Feb-2021
Modified Date:05-Feb-2021
- SUSE Linux Enterprise High Availability Extension
- SUSE Linux Enterprise Server
- SUSE Linux Enterprise Server for SAP Applications

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