[linux-lvm] lvm mirrors
k.c.f.maguire at gmail.com
Fri Aug 22 15:23:03 UTC 2008
I am using LVM on SLES 10+sp2 on a test server.
$ lvs --version
LVM version: 2.02.17 (2006-12-14)
Library version: 1.02.13 (2006-11-28)
Driver version: 4.7.0
I have only 2 disk devices, but noticed that newer versions of LVM
allow me to do mirroring directly in VM. So I created a mirror via:
vgcreate vg01 /dev/sda5 /dev/sdb5
lvcreate vg01 --corelog --mirrors 1 --name XX-m \
I have used /dev/md* type mirrors, built via mdadm before.
What are the pros and cons of the 2 approaches? I have read the man
page entry for --corelog option, and appreciate the re-sync on reboot
for the mirror.
I also know that with md* type mirrors I can see current status via
/proc/mdstat, is there an equivalent for LVM mirrors? Even if I had an
extra device for logs, is there any advantage in the LVM mirroring
over the md* mirroring?
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