[linux-lvm] Recovering from a hard crash
Christian Limpach
chris at pin.lu
Tue Feb 25 11:58:08 UTC 2003
Quoting "Rechenberg, Andrew" <ARechenberg at shermanfinancialgroup.com>:
> Would I then use LVM striping across md[0-9] to get the same effect?
> The reason that this box is configured in such a way is because we want
> the redundancing of RAID1 and the speed of RAID0 (hence RAID10). Will
> LVM striping give the same performance lift as using Linux RAID0?
I would think that performance will be the same. I think you'll get better
performance if you keep some disks apart for your snapshots. Interesting
actually... Which is better: all striped with md which puts the snapshot
striped over all the disks or striping with LVM which will put the snapshot
unstriped on dedicated disks or a combination of these two...
> Also, will the device mapper and LVM2 patches work against a Red Hat
> kernel and are they stable enough to run in a production environment?
device-mapper and LVM2 seem stable, I'm still using LVM1. The device-mapper
code is definitely top-notch. I don't know about Red Hat kernels.
> Also, can anyone see any harm in me modifying the source for vgscan to
> skip /dev/md0 since it will never actually be used in a volume group
> outside of the RAID0 stripe on top of it? Would I have to modify any
> other commands to make sure that I don't run into any trouble?
I think vgscan is all you need to modify, pvscan and lvmdiskscan just display
data. Removing/renaming /dev/md0 is just as good, nothing needs it anyway as
far as I can tell...
--
Christian Limpach <chris at pin.lu>
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