--- "Celso K. Webber" <celso@xxxxxxxxxxxxxxxx> wrote: > Hello all, > > After reading a thread on this list (CLVMD - Do I > need it), I started > playing around with CLVM, just to make sure two > problems I had in the > past were solved: > > 1) LVM normally cannot be used on shared disks, [...] > 2) The other problem is not directly related to > CLVM, but I found no > solution for it (yet). In my setup, I have multiple > paths to the same > devices in the shared storage (either in a SAN or > DAS). Under the EMC > solution, we employ PowerPath to solve the multiple > devices issue for > each LUN. It works quite well. But LVM is not aware > of PowerPath's > multiple path aggregation, so when it scans the PVs > on the LUN's > partitions, it "finds" duplicates for the PVs, like > this: tyhe solution for this is to "filter" the "under-powerpath devices" :-) I mean, to filter to not scan the devices exported by the SAN or DAS, and just use the powerpath devices for the LVM check the file /etc/lvm/lvm.conf > Another matter is that using the /dev/emcpowerX > devices I have also load > balancing, so even if LVM2 did failover to the other > paths (the other > devices), I would loose the load balancing feature I > can achieve with > PowerPath. if you put LVM over powerpath, you are layering the environment, do you? path load balancing and failover are cover by powerpath, and LVM do its own business :-) > Question 2: is there a way to "force" which devices > LVM should employ > when scanning the PVs over the disks Linux > recognize? /etc/lvm/lvm.conf # A filter that tells LVM2 to only use a restricted set of devices. # The filter consists of an array of regular expressions. These # expressions can be delimited by a character of your choice, and # prefixed with either an 'a' (for accept) or 'r' (for reject). # The first expression found to match a device name determines if # the device will be accepted or rejected (ignored). Devices that # don't match any patterns are accepted. cu roger __________________________________________ RedHat Certified Engineer ( RHCE ) Cisco Certified Network Associate ( CCNA ) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
