[rhelv6-list] Antwort: Re: Antwort: MD devices lost after boot

Roth, Sandro Sandro.Roth at zurich-airport.com
Thu Sep 27 10:02:39 UTC 2012


Well that is interesting!

> The new implementation of mirroring leverages MD software RAID, just as for the RAID 4/5/6 implementations.

What does that mean exactly? Is LVM actually using the md driver underneath now?

Doing some testing now..

-----Original Message-----
From: rhelv6-list-bounces at redhat.com [mailto:rhelv6-list-bounces at redhat.com] On Behalf Of jean-yves at lenhof.eu.org
Sent: Donnerstag, 27. September 2012 11:32
To: rhelv6-list at redhat.com
Subject: Re: [rhelv6-list] Antwort: Re: Antwort: MD devices lost after boot

Le 27/09/2012 11:11, Roth, Sandro a écrit :
> IMHO mdadm is much more sophisticated than lvm mirroring.
>
> In my case here, we have two storage subsystems, one in each data 
> center.
> An LVM mirror needs to put a log somewhere, usually on a third disk, 
> we just don't have that!
> And placing the log in memory makes you rebuild it after every reboot.

Not so true anymore...

If you create this mirror with "mirror" I agree with you.
But it seems there's a new option "raid1" available since 6.3

Look here :
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Logical_Volume_Manager_Administration/raid_volumes.html

Is somebody used this in production ?


Regards,

JYL

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