From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: not able to resize/grow RAID-1 (beyond 1 TB?) Date: Fri, 13 Jan 2012 21:35:02 +0100 Message-ID: <4F109576.5090604@wpkg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid List-Id: linux-raid.ids Hi, I have mdadm RAID-1 array which is 1 TB big. I would like to increase it to ~3 TB, since this is what the new partition size is - however, mdadm doesn't want to do it and stays with the old size. Here, mdadm -D output showing the array is 1024 GB: # mdadm -D /dev/md2 /dev/md2: Version : 1.2 Creation Time : Fri Jan 13 07:02:29 2012 Raid Level : raid1 Array Size : 1073740800 (1024.00 GiB 1099.51 GB) Used Dev Size : 1073740800 (1024.00 GiB 1099.51 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Fri Jan 13 21:25:09 2012 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : rescue:2 UUID : 9fc28b3f:7b91d523:8aa20629:5f5bd029 Events : 6699 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 8 19 1 active sync /dev/sdb3 Here, we can see the partitions used by /dev/md2 are ~3 TB big: # parted /dev/sda GNU Parted 2.3 Using /dev/sda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: ATA ST3000DM001-9YN1 (scsi) Disk /dev/sda: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 5 1049kB 2097kB 1049kB bios_grub 1 2097kB 34.4GB 34.4GB raid 2 34.4GB 34.9GB 537MB raid 3 34.9GB 3001GB 2966GB raid (parted) q # parted /dev/sdb GNU Parted 2.3 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: ATA ST3000DM001-9YN1 (scsi) Disk /dev/sdb: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 5 1049kB 2097kB 1049kB bios_grub 1 2097kB 34.4GB 34.4GB raid 2 34.4GB 34.9GB 537MB raid 3 34.9GB 3001GB 2966GB raid (parted) q Now, let's try to grow - it stays unchanged at 1024 GB: # mdadm --grow /dev/md2 --size=max mdadm: component size of /dev/md2 has been set to 1073740800K What am I doing wrong here? -- Tomasz Chmielewski http://wpkg.org