On jeu., 2012-06-21 at 16:54 -0700, Brian Bunker wrote: > Hello everyone, > > > We have hit this problem a couple of times now on our RHEL 6.2 > initiators using our FC target. We have many dm devices which should > have 4 paths to each. Sometimes we see that some of the dm devices do > not have the 4 paths. The underlying /dev/sd devices do exist but they > are not used by the dm device. Here is what I see: > > > mpathbbt (3624a9370f9b69331bb3d16650001000b) dm-11 PURE,FlashArray > size=500G features='0' hwhandler='0' wp=rw > `-+- policy='round-robin 0' prio=1 status=active > |- 1:0:1:12 sds 65:32 active ready running > `- 1:0:0:12 sdae 65:224 active ready running > > > However there are devices for the remaining two paths they are just > not being used by multipathd: > > > /dev/sg18 1 0 1 12 0 /dev/sds PURE FlashArray 100 > /dev/sg30 1 0 0 12 0 /dev/sdae PURE FlashArray 100 > /dev/sg39 0 0 1 12 0 /dev/sdan PURE FlashArray 100 > /dev/sg48 0 0 0 12 0 /dev/sdaw PURE FlashArray 100 > > > You can see by the LUN serial number that the devices do point to the > same LUN on the array. I am including just the LUN serial number, page > 0x80, in the interest of space page 0x83's NAA number also matches for > the 4 devices: > > > root@r13init31 ~]# sg_inq -p 0x80 /dev/sg18 > VPD INQUIRY: Unit serial number page > Unit serial number: F9B69331BB3D16650001000B > > > [root@r13init31 ~]# sg_inq -p 0x80 /dev/sg30 > VPD INQUIRY: Unit serial number page > Unit serial number: F9B69331BB3D16650001000B > > > [root@r13init31 ~]# sg_inq -p 0x80 /dev/sg39 > VPD INQUIRY: Unit serial number page > Unit serial number: F9B69331BB3D16650001000B > > > [root@r13init31 ~]# sg_inq -p 0x80 /dev/sg48 > VPD INQUIRY: Unit serial number page > Unit serial number: F9B69331BB3D16650001000B > > Any ideas why the paths are being rejected by domap? > Have you tried the "group_by_serial" path grouping policy ? There might be funny side effects if the wwid discovered on paths is not the same though ... Can you post the multipath -v3 output concerning those 4 paths discovery. Regard, cvaroqui -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
