Using LVM on local and SAN attached devices
This document (3617600) is provided subject to the disclaimer at the end of this document.
SUSE Linux Enterprise Server 11
SUSE Linux Enterprise Server 10
SUSE Linux Enterprise Server 9
Logical Volume Management (LVM / LVM2)
Multipath I/O (MPIO)
The default LVM filter, which activates LVM on all local storage devices, is as follows, and was originally in use on the machine:
filter = [ "r|/dev/.*/by-path/.*|", "r|/dev/.*/by-id/.*|", "r|/dev/.*/by-name/.*|", "a/.*/"]
During the process of implementing MPIO, the LVM filter was changed to the following recommended configuration, which assumes LVM will only be used on the SAN devices:
filter = [ "a|/dev/disk/by-id/dm-uuid-.*mpath-.*|", "r|.*|"]
types = [ "device-mapper", 1 ]
For example, if your local disk is /dev/sda and all SAN devices have the correct device nodes in /dev/disk/by-id/
SLES11: filter = [ "a|/dev/sda.*|", "a|/dev/disk/by-id/dm-uuid-.*mpath-.*|", "r|.*|"]
SLES10: filter = [ "a|/dev/sda.*|", "a|/dev/disk/by-name/.*|", "r|.*|"]
If the local devices are on an HP SmartArray controller with cciss devices, the filter should look like:
SLES11: filter = [ "a|/dev/cciss/.*|", "a|/dev/disk/by-id/dm-uuid-.*mpath-.*|", "r|.*|"]
SLES10: filter = [ "a|/dev/cciss/.*|", "a|/dev/disk/by-name/.*|", "r|.*|"]
When using the filter specifically references the acceptable block devices, the 'types' setting in /etc/lvm/lvm.conf may be commented out as follows:
#types = [ "device-mapper", 1 ]
filter = [ "a|/dev/sd.*|", "a|/dev/disk/by-name/.*|", "r|.*|"]
This filter scans all /dev/sd* and activates them for use with LVM. Multipathed devices use device nodes created under /dev/disk/by-id, but also have /dev/sd* device nodes created for each physical path to the LUN. If these raw device nodes are scanned by LVM, there is a possibility that the LVM metadata will be read and activated on a raw path, rather than the multipath device node. This will result in a loss of fault tolerance and load balancing.
For additional information on using LVM on MPIO devices, see TID 7007498 - Using LVM on Multipath (DM MPIO) Devices.
2009 Sep 18: Jason Record - Updated products, label and emphasis.
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- Document ID:3617600
- Creation Date:27-JUL-06
- Modified Date:14-MAR-16
- NovellOpen Enterprise Server
- SUSESUSE Linux Enterprise Server
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