On 09/01/13 18:13, Adam Goryachev wrote: > Actually, once I remembered that I did this before when I upgraded, I > went to google, and found: > http://permalink.gmane.org/gmane.linux.raid/38963 > > Which was the result of my request last time: > NeilBrown <http://search.gmane.org/?author=NeilBrown&sort=date> | 25 > Jun 2012 04:52 > I just checked this will loop devices and it works as expected (assuming you > have 1.1 or 1.2 metadata). > So: > mdadm -S /dev/md2 > mdadm -A --update=devicesize /dev/md0 /dev/md1 > (order doesn't matter with assemble). > So, as soon as I can unmount the partition, I'll give that a try > again, and hopefully I'm all sorted. > > Since I spent so much time typing all the below, I'll leave it there > anyway. > > Thanks again for everyone's help, and just another reminder to check > google first, someone else (or yourself) might have had the same > question before :) OK, so this is ... almost working.... I've worked out that I can't use fdisk on a drive larger than 2TB, so I've now moved onto parted. I remove one drive from the raid array (fail and remove), then used parted to create a GPT partition, and partitioned, then added the new drive back to the RAID1, waited for it to sync, and then repeated the process with the second drive. However, it doesn't seem to be working properly on the second drive as I don't get the extra space: This one is working/the right size parted /dev/sdc print Model: ATA WDC WD30EFRX-68A (scsi) Disk /dev/sdc: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 3001GB 3001GB primary raid mdadm --misc --examine /dev/sdc1 /dev/sdc1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 84e0923e:a10ebc3a:fc28c832:2341bfd8 Name : myhost:1 (local to host myhost) Creation Time : Wed Feb 1 19:26:45 2012 Raid Level : raid1 Raid Devices : 2 Avail Dev Size : 5860528128 (2794.52 GiB 3000.59 GB) Array Size : 4294963199 (2048.00 GiB 2199.02 GB) Used Dev Size : 4294963199 (2048.00 GiB 2199.02 GB) Data Offset : 2048 sectors Super Offset : 8 sectors State : clean Device UUID : 56c29503:527ce1ec:2af3394a:1739e6f4 Update Time : Thu Jan 10 23:02:47 2013 Checksum : 1003d87f - correct Events : 50468 Device Role : Active device 0 Array State : A. ('A' == active, '.' == missing) Note the "Avail Dev Size" is 3TB, larger than the Array Size and Used Dev Size. This drive is not working properly, but parted looks correct (identical to the working one above): parted /dev/sde print Model: ATA WDC WD30EFRX-68A (scsi) Disk /dev/sde: 3001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 3001GB 3001GB primary raid mdadm --misc --examine /dev/sde1 /dev/sde1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 84e0923e:a10ebc3a:fc28c832:2341bfd8 Name : keep.websitemanagers.com.au:1 (local to host keep.websitemanagers.com.au) Creation Time : Wed Feb 1 19:26:45 2012 Raid Level : raid1 Raid Devices : 2 Avail Dev Size : 4294963199 (2048.00 GiB 2199.02 GB) Array Size : 4294963199 (2048.00 GiB 2199.02 GB) Data Offset : 2048 sectors Super Offset : 8 sectors State : clean Device UUID : 5b37728e:f4e4ee3c:03284a2a:375bc4e7 Update Time : Thu Jan 10 22:56:46 2013 Checksum : 608e6b8c - correct Events : 50428 Device Role : Active device 1 Array State : AA ('A' == active, '.' == missing) This time the "Avail Dev Size" is the same as previously when I used fdisk to create a normal partition, so it looks like the GPT partition is not visible. If I remove sde1 from the array (fail and remove) and then try to run kpartx -av /dev/sde I get this: kpartx -av /dev/sde add map sde1 (253:0): 0 5860530176 linear /dev/sde 2048 but mdadm --misc --examine /dev/sde1 does not change at all Two questions: 1) How or what do I need to do to get sde1 to show the correct size? Once that happens, I can grow the RAID1 array, and then I can extend the linear array 2) Are these partitions aligned properly? When I re-add the partition to the array, I see this in dmesg: md1: Warning: Device sde1 is misaligned I know fdisk is not going to work properly, but it also shows a mis-alignment: fdisk -l /dev/sde WARNING: GPT (GUID Partition Table) detected on '/dev/sde'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sde: 3000.6 GB, 3000592982016 bytes 255 heads, 63 sectors/track, 364801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sde1 1 267350 2147483647+ ee GPT Partition 1 does not start on physical sector boundary. However, parted says it is optimal: (parted) align-check alignment type(min/opt) [optimal]/minimal? Partition number? 1 1 aligned I thought I read that the partition should start at 1M, but parted seems to have put it a little further. So I don't know what to believe.... Any comments/suggestions would be appreciated. Thanks, Adam -- Adam Goryachev Website Managers Ph: +61 2 8304 0000 adam@xxxxxxxxxxxxxxxxxxxxxx Fax: +61 2 8304 0001 www.websitemanagers.com.au -- 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
