Add integrity layer presence check

_posts/sysadm/2023-09-15-lvm-cheat-sheet.tl

@@ -65,6 +65,11 @@ If RAID1 with integrity LV requires refresh (partial synchronization) due to
 e.g.  device write errors, but both PVs are otherwise available, take the
 following steps to fix it:
 
+* check if integrity layer is present:
+{% highlight bash %}
+# lvs -o+raidintegritymode
+{% endhighlight %}
+
 * remove integrity layer:
 {% highlight bash %}
 # lvconvert --raidintegrity n vgdev/backup