Hello I have two questions: 1) is it ok to use raw devices with device mapper and multipathing? I have the following simple setup under RHEL4.3 (x86_64), e.g. one LUN exported from a SUNStoredge 3511 directly to the host which has two HBA, therefore I see the same LUN twice, as sdc and sdd: # multipath -l mpath2 (3600c0ff00000000009279811b3f44a00) [size=1862 GB][features="0"][hwhandler="0"] \_ round-robin 0 [active] \_ 1:0:0:0 sdc 8:32 [active][ready] \_ 2:0:0:0 sdd 8:48 [active][ready] I made 2 partitions on the mpath2 device and used kpartx to make is visible to device mapper, e.g. # ll /dev/mpath/ total 0 lrwxrwxrwx 1 root root 7 Aug 7 17:50 mpath2 -> ../dm-0 lrwxrwxrwx 1 root root 7 Aug 8 10:32 mpath2p1 -> ../dm-1 lrwxrwxrwx 1 root root 7 Aug 8 10:32 mpath2p2 -> ../dm-2 if I then proceed to asssigne raw devices, it seems to work # raw /dev/raw/raw2 /dev/dm-2 /dev/raw/raw2: bound to major 253, minor 2 # raw -qa /dev/raw/raw2: bound to major 253, minor 2 is then suitable to use /dev/raw/raw2 with databases (namely sybase ASE 15)? 2) second question: is the SUN Storedge 3511 an active/active array and if not, do I need to worry about hardware handlers specific for it? many thanks for your help! antonello -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
