* raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? @ 2004-05-17 15:08 TJ Harrell 2004-05-17 20:28 ` Guy 0 siblings, 1 reply; 3+ messages in thread From: TJ Harrell @ 2004-05-17 15:08 UTC (permalink / raw) To: linux-raid I have a raid 5 array consisting of 3 disks. The smallest disk is 195191168 blocks. The array only uses 172551296 blocks from each device. Numbers ar from output of mdadm. I would like to grow the array to the largest posssible size. I tried doing a raidreconf using identical settings in raidtab.old and raidtab.new, and it said the size would remain unchanged when it asked for confirmation. Is there a way to tweak it to do what I want, or could I just mkraid -f the existing array? I'm afraid if I just do a mkraid -f it will fubar the old array by laying out parity info differently or something since the size of the array will be different. Raidtab: raiddev /dev/md0 raid-level linear nr-raid-disks 3 persistent-superblock 1 chunk-size 128 device /dev/hdk1 raid-disk 0 device /dev/hdi1 raid-disk 1 device /dev/hda3 raid-disk 2 raiddev /dev/md1 raid-level 5 nr-raid-disks 3 persistent-superblock 1 chunk-size 64 device /dev/hdg1 raid-disk 0 device /dev/md0 failed-disk 1 device /dev/hdc1 raid-disk 2 Output of "raidreconf -o /etc/raidtab -n /etc/raidtab.new -m /dev/md1" Working with device /dev/md1 Parsing /etc/raidtab Parsing /etc/raidtab.new Size of old array: 1171815940 blocks, Size of new array: 1171815940 blocks Old raid-disk 0 has 3052474 chunks, 195358336 blocks Old raid-disk 1 has 3049861 chunks, 195191104 blocks Old raid-disk 2 has 3052474 chunks, 195358336 blocks New raid-disk 0 has 3052474 chunks, 195358336 blocks New raid-disk 1 has 3049861 chunks, 195191104 blocks New raid-disk 2 has 3052474 chunks, 195358336 blocks Using 64 Kbyte blocks to move from 64 Kbyte chunks to 64 Kbyte chunks. Detected 418432 KB of physical memory in system A maximum of 1394 outstanding requests is allowed --------------------------------------------------- I will convert your old device /dev/md1 of 6102335 blocks to a new device /dev/md1 of same size using a block-size of 64 KB Is this what you want? (yes/no): no ^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? 2004-05-17 15:08 raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? TJ Harrell @ 2004-05-17 20:28 ` Guy 2004-05-17 20:59 ` TJ Harrell 0 siblings, 1 reply; 3+ messages in thread From: Guy @ 2004-05-17 20:28 UTC (permalink / raw) To: 'TJ Harrell', linux-raid I don't understand the size of your array! If you have 3 disks about 200G each, your RAID5 array should be about 400G. But your array is 1171815940 blocks! That's 1171G, about 3 times larger than it should be. Just to verify the size of the disks and the array, do these commands: fdisk -l /dev/hdg fdisk -l /dev/hdc fdisk -l /dev/hdk fdisk -l /dev/hdi fdisk -l /dev/hda cat /proc/mdstat mdadm -D /dev/md0 mdadm -D /dev/md1 Guy -----Original Message----- From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-owner@vger.kernel.org] On Behalf Of TJ Harrell Sent: Monday, May 17, 2004 11:09 AM To: linux-raid@vger.kernel.org Subject: raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? I have a raid 5 array consisting of 3 disks. The smallest disk is 195191168 blocks. The array only uses 172551296 blocks from each device. Numbers ar from output of mdadm. I would like to grow the array to the largest posssible size. I tried doing a raidreconf using identical settings in raidtab.old and raidtab.new, and it said the size would remain unchanged when it asked for confirmation. Is there a way to tweak it to do what I want, or could I just mkraid -f the existing array? I'm afraid if I just do a mkraid -f it will fubar the old array by laying out parity info differently or something since the size of the array will be different. Raidtab: raiddev /dev/md0 raid-level linear nr-raid-disks 3 persistent-superblock 1 chunk-size 128 device /dev/hdk1 raid-disk 0 device /dev/hdi1 raid-disk 1 device /dev/hda3 raid-disk 2 raiddev /dev/md1 raid-level 5 nr-raid-disks 3 persistent-superblock 1 chunk-size 64 device /dev/hdg1 raid-disk 0 device /dev/md0 failed-disk 1 device /dev/hdc1 raid-disk 2 Output of "raidreconf -o /etc/raidtab -n /etc/raidtab.new -m /dev/md1" Working with device /dev/md1 Parsing /etc/raidtab Parsing /etc/raidtab.new Size of old array: 1171815940 blocks, Size of new array: 1171815940 blocks Old raid-disk 0 has 3052474 chunks, 195358336 blocks Old raid-disk 1 has 3049861 chunks, 195191104 blocks Old raid-disk 2 has 3052474 chunks, 195358336 blocks New raid-disk 0 has 3052474 chunks, 195358336 blocks New raid-disk 1 has 3049861 chunks, 195191104 blocks New raid-disk 2 has 3052474 chunks, 195358336 blocks Using 64 Kbyte blocks to move from 64 Kbyte chunks to 64 Kbyte chunks. Detected 418432 KB of physical memory in system A maximum of 1394 outstanding requests is allowed --------------------------------------------------- I will convert your old device /dev/md1 of 6102335 blocks to a new device /dev/md1 of same size using a block-size of 64 KB Is this what you want? (yes/no): no - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? 2004-05-17 20:28 ` Guy @ 2004-05-17 20:59 ` TJ Harrell 0 siblings, 0 replies; 3+ messages in thread From: TJ Harrell @ 2004-05-17 20:59 UTC (permalink / raw) To: Guy, linux-raid I bit my tongue and tried doing a "mkraid -f /dev/md1" after ensuring that my raidtab had the correct order of disks. The raid array did successfully resize without any loss of data, and began to resync. My current status is: cat /proc/mdstat md1 : active raid5 hdc1[2] md0[1] hdg1[0] 390382208 blocks level 5, 64k chunk, algorithm 0 [3/3] [UUU] [>....................] resync = 3.7% (7268880/195191104) finish=6181.6min speed=504K/sec md0 : active linear hda3[2] hdi1[1] hdk1[0] 195191168 blocks 128k rounding Summary: I had a RAID 5 array that did not take up all available disk space on the drives. I stopped the raid array, ensured that my raidtab was up to date, and ran mkraid -f on the array. This overwrote the old array's superblocks and created a new array on top of the old one that took up the maximum available space and preserved the contents of the old array. The output from raidreconf is very odd to me too. The size of the array is incorrect. The size of the disks look pretty close, though. Here's the output after I resized the array. Before I did it, everything was the same except that the array was only approx 345102528 blocks. root@darkstar:/home# fdisk -l /dev/hdg Disk /dev/hdg: 200.0 GB, 200049647616 bytes 255 heads, 63 sectors/track, 24321 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hdg1 1 24321 195358401 83 Linux root@darkstar:/home# fdisk -l /dev/hdc Disk /dev/hdc: 200.0 GB, 200049647616 bytes 255 heads, 63 sectors/track, 24321 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hdc1 1 24321 195358401 fd Linux raid autodetect root@darkstar:/home# fdisk -l /dev/hdk Disk /dev/hdk: 120.0 GB, 120034123776 bytes 255 heads, 63 sectors/track, 14593 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hdk1 1 14593 117218241 83 Linux root@darkstar:/home# fdisk -l /dev/hdi Disk /dev/hdi: 46.1 GB, 46115758080 bytes 16 heads, 63 sectors/track, 89355 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Device Boot Start End Blocks Id System /dev/hdi1 1 89355 45034888+ 83 Linux root@darkstar:/home# fdisk -l /dev/hda Disk /dev/hda: 40.0 GB, 40020664320 bytes 16 heads, 63 sectors/track, 77545 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Device Boot Start End Blocks Id System /dev/hda1 1 10159 5120104+ 83 Linux /dev/hda2 10160 12191 1024128 82 Linux swap /dev/hda3 12192 77545 32938416 83 Linux root@darkstar:/home# mdadm -D /dev/md0 /dev/md0: Version : 00.90.00 Creation Time : Sat May 15 13:07:11 2004 Raid Level : linear Array Size : 195191168 (186.15 GiB 199.88 GB) Raid Devices : 3 Total Devices : 3 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Sat May 15 13:07:11 2004 State : dirty, no-errors Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Rounding : 128K Number Major Minor RaidDevice State 0 57 1 0 active sync /dev/hdk1 1 56 1 1 active sync /dev/hdi1 2 3 3 2 active sync /dev/hda3 UUID : f9f7071e:b673fea6:ff12b406:9bb0576a Events : 0.1 root@darkstar:/home# mdadm -D /dev/md1 /dev/md1: Version : 00.90.00 Creation Time : Mon May 17 11:19:55 2004 Raid Level : raid5 Array Size : 390382208 (372.30 GiB 399.75 GB) Device Size : 195191104 (186.15 GiB 199.88 GB) Raid Devices : 3 Total Devices : 3 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Mon May 17 11:19:55 2004 State : dirty, no-errors Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : left-asymmetric Chunk Size : 64K Rebuild Status : 5% complete Number Major Minor RaidDevice State 0 34 1 0 active sync /dev/hdg1 1 9 0 1 active sync /dev/md0 2 22 1 2 active sync /dev/hdc1 UUID : 5cf50002:0bcbc32e:07694ae5:d5735f48 Events : 0.1 ----- Original Message ----- From: Guy To: 'TJ Harrell' ; linux-raid@vger.kernel.org Sent: Monday, May 17, 2004 4:28 PM Subject: RE: raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? I don't understand the size of your array! If you have 3 disks about 200G each, your RAID5 array should be about 400G. But your array is 1171815940 blocks! That's 1171G, about 3 times larger than it should be. Just to verify the size of the disks and the array, do these commands: fdisk -l /dev/hdg fdisk -l /dev/hdc fdisk -l /dev/hdk fdisk -l /dev/hdi fdisk -l /dev/hda cat /proc/mdstat mdadm -D /dev/md0 mdadm -D /dev/md1 Guy ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2004-05-17 20:59 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2004-05-17 15:08 raidreconf won't resize a RAID 5 array. Can it be done with mkraid -f ? TJ Harrell 2004-05-17 20:28 ` Guy 2004-05-17 20:59 ` TJ Harrell
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