From mboxrd@z Thu Jan 1 00:00:00 1970 From: shamim Subject: grow MULTIPATH RAID Date: Fri, 25 Mar 2011 03:13:41 +0000 (UTC) Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hello Experts, Please help me to grow MULTIPATH RAID. =20 My problem: I've Linux box which have MULTIPATH RAID created on them. Now we need t= o remove those old LUN and move data onto new LUN presented to those boxes. My initially thought was to grow the current MULTIPATH RAID (/dev/md0)= and=20 make old LUN as spare and then failed and then remove(Is this a right approach?). When I=E2=80=99m try adding new LUNs to it, they are getti= ng added as spare ( as shown below). And when I try to grow , it refuse to do so. Below= are the steps that I performed and error message.(Cannot reshaped!!)=20 ( I read somehwere that we can=E2=80=99t grow MULTIPATH RAID, if it is= TRUE, then what would be suggested solution to move data from old LUNs to new LUNs) Please help -------------------------------------------------- =20 # mdadm --detail /dev/md0 /dev/md0: Version : 0.90 Creation Time : Thu Mar 24 13:54:41 2011 Raid Level : multipath Array Size : 10486016 (10.00 GiB 10.74 GB) Raid Devices : 2 Total Devices : 4 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Mar 24 13:54:41 2011 State : clean Active Devices : 2 Working Devices : 4 Failed Devices : 0 Spare Devices : 2 UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Events : 0.3 Number Major Minor RaidDevice State 0 65 0 0 active sync /dev/sdq 1 8 96 1 active sync /dev/sdg -------------------------------------------------------------------- # mdadm /dev/md0 --add /dev/sdr /dev/sdh mdadm: added /dev/sdr mdadm: re-added /dev/sdh -------------------------------------------------------------------- # mdadm --detail /dev/md0 /dev/md0: Version : 0.90 Creation Time : Thu Mar 24 13:54:41 2011 Raid Level : multipath Array Size : 10486016 (10.00 GiB 10.74 GB) Raid Devices : 2 Total Devices : 4 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Mar 24 13:54:41 2011 State : clean Active Devices : 2 Working Devices : 4 Failed Devices : 0 Spare Devices : 2 UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Events : 0.3 Number Major Minor RaidDevice State 0 65 0 0 active sync /dev/sdq 1 8 96 1 active sync /dev/sdg 2 65 16 - spare /dev/sdr 3 8 112 - spare /dev/sdh -------------------------------------------------------------------- # mdadm --grow /dev/md0 --raid-disks=3D4 mdadm: multipath array /dev/md0 cannot be reshaped. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html