[linux-lvm] SAN Storage/mirror/lvm

Franc Carter franc at tech.sirca.org.au
Fri Jul 23 11:04:22 UTC 2004

I setup a similar system on a HDS-9570 but with only one
card in each machine - 'assuming' that the failover in the
driver would cope if a controller on the HDS failed (as
opposed to a QLogic failure)

This worked fine if I disconncected a path in the fabric but
when we took a controller of line the failover failed.

Since then I have used md multipath which has tested fine

On Fri, Jul 23, 2004 at 10:52:45AM +0200, Thomas Meller wrote:
> Maybe everything is all right with what I am doing - maybe not.
> I have heard roumors that my setup may cause troubles.
> Does anybody know something about it?
> I try to set up a cluster on a SAN with shared disks, mirrored over 2 storage controllers.
> Using QLogic HBAs, I have set
> ql2xfailover=1
> to use the multipathing feature.
> We have 2 separate fabrics to connect to the storage and 2 HBAs in each machine.
> Disk layout:
> A           B   (controllers)
> sda        sdf
> sdb        sdg
> sdc mirror sdh -+
> sdd mirror sdi  |
> sde mirror sdj -+
>                 |
>                 +-- volume group
> Also, we do not have much write thruput to the disks.
> I use reiserfs because I could resize it w/o remounting.
> Austin Gonyou has written something about write cache mirroring - what is that?
> Necessary?
> Howto?
> I use LVM1
> Am I in danger?
> Thanks
> Thomas
> -- 
> Thomas Meller
> mailto: thomas.meller at t-systems.ch
> mailto: thomas.meller at gmx.net
> ----
> ...Our continuing mission: To seek out knowledge of C, to explore strange
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Franc Carter     Ph:61-2-9236-9127      Fax: 61-2-9321-5988
Systems Manager, SIRCA Ltd              http://www.sirca.org.au/

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