On 23/02/11 16:12, Ray Morris wrote:
On 23/02/11 14:16, Joe Thornber wrote:
And how do I zero just exception store?
In this example, the normal lv is c1_s1.
It has two snapshots, c1_s1_snap0 and c1_s1_snap1.
List the underlying volumes like so:
[root@clonebox2 ~]# ls -1 /dev/mapper/clones-c1_s1*
/dev/mapper/clones-c1_s1
/dev/mapper/clones-c1_s1-real
/dev/mapper/clones-c1_s1_snap0
/dev/mapper/clones-c1_s1_snap0-cow
/dev/mapper/clones-c1_s1_snap1
/dev/mapper/clones-c1_s1_snap1-cow
Half of those would be hidden to lvdisplay, though the man
page will probably tell you how to show hidden LVs. "ls"
shows them all.
c1_s1_snap0-cow and c1_s1_snap1-cow are the copy on write
volumes, the exception stores, I believe. -real is where
the current data lives, and c1_s1, the "main" LV is a basically
a proxy which reads directly from -rela, but diverts writes
so that old data is copied to -cow. -snap0 is a proxy which
reads from either -cow or -real as needed. Hopefully someone
will tell me where I'm wrong, if I am.
Zeroing c1_s1 first, then c1_s1_snap0-cow would zero everything,
Thanks for the explanation. But what if I don't want to zero everything?
I only want to return everything back to the state it was before I
created the snapshot.
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