Hi, Let me describe an strange issue that I had before a month to a customer.
I had two disks with two paths per disk and I wanted to create a LVM volume on both of them (different volume and diffente volume group). So, I had to edit the lvm.conf file to add on the FILTER option the disks that volume manager will scan for volumes. In my configuration I had an internal disk (sda which had the root & swap logical volumes) and two external (storage) disks with two paths per disk: external disk 1 (mpath0) paths: sdb sdc external disk2 (mpath1) paths: sdd sde For the external disks I had enabled the multipathd and I had mpath0 for sdb,sdc and mpath1 for sdd, sde. Suddenly, my internal disk sda changed to sdc. I checked it by the pvscan command. And the sdc path changed to sda. That time, I had the default FILTER option enabled on lvm.conf. I guess that this was the reason that I didn't lose my root volume which I had on internal disk. Also I didn't had any volumes on mpath0 and mpath1. Finally, after a reboot, my internal disk name switched back to the initial name (sda). I believe that I have to change the default filter option: filter = [ "a/.*/" ] to filter = [ "a|/dev/sda|", "a|/dev/mapper/mpath.*|" ] which means that volume manager will scan the /dev/sda and /dev/mapper/mpath* for LVM volumes. Also I would like to notice that with the filter = [ "a|/dev/sda|", "a|/dev/mapper/mpath.*|" ] I will not have any "found duplicate pv" warnings, on pvscan execution command. If I change the default filter option to [ "a|/dev/sda|", "a|/dev/mapper/mpath.*|" ], then what will happen to my logical volumes in the future if suddenly the sda became sdc again? In this condition first of all I will loose my root disk. I don't know if I will have any other consequences on the volumes on my mpath* devices. My question is what persistent disk name I can use instead of /dev/sda on filter option of lvm.conf file, because if the sda became sdc then I will have problems with my logical volumes. Regards, George 2012/8/21 george application <appli...@gmail.com> > Hi, > > Does anyone know if I can use the disk name /dev/disk/by-id/scsi-xxxx > format on the FILTER option of lvm.conf file instead of /dev/sdX? > > For example, I don't want to use the disk name "/dev/sda", because it is > not persistent, and some times my sda changes to sdc. > > Thanks in advance, > AGS
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