Laurenz, Dirk wrote:
Hi,
i'm doing this:
hgest3301:~/LVM2.2.02.06 # lvcreate -m1 -n lvmirror -L 10G
vgtest /dev/dm-55 /dev/dm-56
Not enough PVs with free space available for parallel allocation.
Consider --alloc anywhere if desperate.
what's wrong?
Is there any documentation out there?
Why do we need three pvs? for a mirror?
Are there any other options?
As you noticed, you need a log partition. dm-mirror is a bit smarter
then the basic MD raid1 in that it uses a log disk to keep track of
write completions for synchronization. I've only recently got a kernel
that supports modern mirror, but it looks like the log file sticks at a
single extent even with a 20gb mirror (all my free space).
Is there a reason that the mirror is on a separate volume rather then a
serialized metadata chunk at the end of each? Just for seektime
performance reasons?
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