Sorry, I am probably being thick here, but do you mean something like: mdadm --create /dev/md10 --level=multipath --raid-devices=2 /dev/sdc /dev/sdd When I tried this I got: # mdadm --create /dev/md10 --level=multipath --raid-devices=2 /dev/sdc /dev/sdd mdadm: /dev/sdc is too small: 0K mdadm: create aborted # -----Original Message----- From: goswin-v-b@xxxxxx [mailto:goswin-v-b@xxxxxx] Sent: 03 November 2009 19:32 To: Simon Jackson Cc: linux-raid@xxxxxxxxxxxxxxx Subject: Re: Migrating RAID 1 volumes to Dual ported disks. Simon Jackson <sjackson@xxxxxxxxxxx> writes: > Hi. > > I am currently using SATA drives in a RAID 1 configuration. I am looking to use SAS drives instead of SATA. As my first experiment I have plugged my SAS drive into a system and I have noticed that Linux sees the individual ports on the device as separate devices, so I have /dev/sdc and /dev/sdd which are both the same physical device. > > So if I have a system with 2 SAS drives I am going to have 4 devices representing the two physical drives. So my question is how do I create RAID 1 sets for partitions on these types of drive? > > My existing system carves 3 RAID 1 volumes from a pair of drives. How do I translate this to the dual port SAS devices? > > Thanks Simon. You would set up multipath to combine the two paths to the same disk as a single device and then run raid over that. MfG Goswin -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
