Differences

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--- quickreference:lvm2 [2020/10/30 01:00] – rodolico
+++ quickreference:lvm2 [2024/12/07 13:36] (current) – [Too Much Information] rodolico
@@ Line 45: / Line 45: @@
 <code python>
+# only check RAID volumes (/dev/md0), ignore everything else
 filter=[ "a|^/dev/md|", "r/.*/" ]
+# only check /dev/sda, nothing else
+filter = [ "a|^/dev/sda$|", "r|^/dev/*|" ]
+# Finally, accept sda, sdb, any md, then ignore anything else
+filter = [ "a|^/dev/md|","a|^/dev/sda$|","a|^/dev/sdb$|", "r|^/dev/*|" ]
+</code>
+To determine which drives are actually local, you can use the **mount** command. For example:
+<code bash>
+mount | grep '^/dev'
+</code>
+will show all mounted drives which are local, ignoring nfs, tmpfs, etc...
+After making the change, rescan LVM with one of the following commands
+<code bash>
+# yes, start, not reload, not restart, start
+vgscan
+# OR
+service lvm2 start
+# OR
+lvm vgchange -aay --sysinit
 </code>
@@ Line 132: / Line 153: @@
   - If you had no problems and want the machine in the new state permanently, remove the snapshot with<code bash>lvremove /dev/vg0/snap.virt</code>
     - be sure you don't delete the wrong one, that is why I precede snapshots with "snap"
-    - Please note: running an LV with a snapshot decreases efficiency. Any writes to the original generate a write to the snapshot, so you are decreasing disk access speed greatly. Don't leave spare snapshots laying around past the time you need them,
+    - Please note: running an LV with a snapshot decreases efficiency. Many (most?) writes to the original generate a write to the snapshot, so you are decreasing disk access speed greatly. Don't leave spare snapshots laying around past the time you need them,