SAN Storage/mirror/lvm
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
Signature · 6 lines
Thomas Meller mailto: [email protected] mailto: [email protected] ---- ...Our continuing mission: To seek out knowledge of C, to explore strange UNIX commands, and to boldly code where no man page has ever been seen
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
Quoted 50 lines · Thomas Meller
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 groupAlso, 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 LVM1Am I in danger?
Thanks
Thomas
Signature · 11 lines
Thomas Meller mailto: [email protected] mailto: [email protected] ---- ...Our continuing mission: To seek out knowledge of C, to explore strange UNIX commands, and to boldly code where no man page has ever been seen _______________________________________________ linux-lvm mailing list [email protected] https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
Signature · 12 lines
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