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2005/12末〜2006/1ごろ、raidreconfを誤ってCtrl+Cで止めたときのこと HDD1: 距離をHDD1台分離してあったもの HDD2: 距離を少しだけ離してあったもの HDD3: となりとぴったりくっついていた 14:05 復帰 cfdisk /dev/sdd hdd全体を1パーティションにして、typeをfd (linux raid autodetect)にする [nickle@itefu ~]% sudo raidreconf -o /etc/raidtab -n /etc/raidtab.new -m /dev/md0 Working with device /dev/md0 Parsing /etc/raidtab Parsing /etc/raidtab.new Size of old array: 1465176006 blocks, Size of new array: 1953568008 blocks Old raid-disk 0 has 3815561 chunks, 244195904 blocks Old raid-disk 1 has 3815561 chunks, 244195904 blocks Old raid-disk 2 has 3815561 chunks, 244195904 blocks New raid-disk 0 has 3815561 chunks, 244195904 blocks New raid-disk 1 has 3815561 chunks, 244195904 blocks New raid-disk 2 has 3815561 chunks, 244195904 blocks New raid-disk 3 has 3815561 chunks, 244195904 blocks Using 64 Kbyte blocks to move from 64 Kbyte chunks to 64 Kbyte chunks. Detected 776428 KB of physical memory in system A maximum of 2588 outstanding requests is allowed --------------------------------------------------- I will grow your old device /dev/md0 of 7631122 blocks to a new device /dev/md0 of 11446683 blocks using a block-size of 64 KB Is this what you want? (yes/no): yes Converting 7631122 block device to 11446683 block device Allocated free block map for 3 disks 4 unique disks detected. Working (\) [00231329/07631122] [# ] [nickle@itefu ~]% sudo raidreconf -o /etc/raidtab -n /etc/raidtab.new -m /dev/md0 Password: Working with device /dev/md0 Parsing /etc/raidtab Parsing /etc/raidtab.new Size of old array: 1465176006 blocks, Size of new array: 1953568008 blocks Old raid-disk 0 has 3815561 chunks, 244195904 blocks Old raid-disk 1 has 3815561 chunks, 244195904 blocks Old raid-disk 2 has 3815561 chunks, 244195904 blocks New raid-disk 0 has 3815561 chunks, 244195904 blocks New raid-disk 1 has 3815561 chunks, 244195904 blocks New raid-disk 2 has 3815561 chunks, 244195904 blocks New raid-disk 3 has 3815561 chunks, 244195904 blocks Using 64 Kbyte blocks to move from 64 Kbyte chunks to 64 Kbyte chunks. Detected 776428 KB of physical memory in system A maximum of 2588 outstanding requests is allowed --------------------------------------------------- I will grow your old device /dev/md0 of 7631122 blocks to a new device /dev/md0 of 11446683 blocks using a block-size of 64 KB Is this what you want? (yes/no): no [nickle@itefu ~]% ps PID TTY TIME CMD 8763 pts/0 00:00:00 zsh 9446 pts/0 00:00:00 ps [nickle@itefu ~]% sudo mdadm -A --scan mdadm: /dev/md0 has been started with 3 drives. [nickle@itefu ~]% cat /proc/mdstat Personalities : [raid5] md0 : active raid5 sda1[0] sdc1[2] sdb1[1] 488391808 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] unused devices:
[nickle@itefu ~]% sudo mount -a mount: sys already mounted or /sys busy mount: according to mtab, sysfs is already mounted on /sys [nickle@itefu ~]% cd /home/data [nickle@itefu /home/data]% ls -l ls: app: 未知のエラー 990 ls: incoming: 未知のエラー 990 ....... ls: download: 未知のエラー 990 [nickle@itefu /home/data]% cd audio cd: 未知のエラー 990: audio [nickle@itefu /home/data]% cd priv cd: 未知のエラー 990: priv [nickle@itefu /home/data]% cd - ~ [nickle@itefu ~]% sudo umount /home/data Old raid-disk 0 has 3815561 chunks, 244195904 blocks Old raid-disk 1 has 3815561 chunks, 244195904 blocks Old raid-disk 2 has 3815561 chunks, 244195904 blocks 64 Kbyte chunk Working (\) [00231329/07631122] [# 3815561 * 2 = 7631122 3815561 * 64 * 1024 = 250056605696 244195904 blocks * 1024 byte = 250056605696 231329 / 2 * 64 * 1024 = 7,580,188,672 bytes 余裕を持って8Gバックアップしておけばとりあえず安心? 244195904 / 3815561 = 64 231329 * 64 = 14805056 1500*64 = 96000 7631122*64 * 64 * 1024 = 32007245529088 dd if=/dev/sda of=sda_head.bin count=15625000 (8000000000 / 512 = 15625000) sddはどこまでバックアップ取ろう 231329 / 7631122 = 0.03031389093242121 500 * 0.03031389093242121 = 15.156945466210604 231329 * 64 * 1024 = 15,160,377,344 155236 * 64 * 1024 = 10,173,546,496 0 - 155235 testing: 14805056 to 14905055 invalid block: 14805056 to 14882673 correct block: 14882674 to 14905055 14777618 / 64 = 230900.28125 14882674 / 64 = 232541.78125 var/log/messages Dec 30 18:05:26 localhost kernel: md: md0 stopped. Dec 30 18:05:26 localhost kernel: md: bind
Dec 30 18:05:26 localhost kernel: md: bind
Dec 30 18:05:26 localhost kernel: md: bind
Dec 30 18:05:26 localhost kernel: raid5: device sda1 operational as raid disk 0 Dec 30 18:05:26 localhost kernel: raid5: device sdc1 operational as raid disk 2 Dec 30 18:05:26 localhost kernel: raid5: device sdb1 operational as raid disk 1 Dec 30 18:05:26 localhost kernel: raid5: allocated 3160kB for md0 Dec 30 18:05:26 localhost kernel: raid5: raid level 5 set md0 active with 3 out of 3 devices, algorithm 2 Dec 30 18:05:26 localhost kernel: RAID5 conf printout: Dec 30 18:05:26 localhost kernel: --- rd:3 wd:3 fd:0 Dec 30 18:05:26 localhost kernel: disk 0, o:1, dev:sda1 Dec 30 18:05:26 localhost kernel: disk 1, o:1, dev:sdb1 Dec 30 18:05:26 localhost kernel: disk 2, o:1, dev:sdc1 Dec 30 18:05:52 localhost kernel: XFS mounting filesystem md0 Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+991/229974] xfs_da_do_buf+0x3d0/0x920 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+2535/229974] xfs_da_read_buf+0x58/0x60 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+2535/229974] xfs_da_read_buf+0x58/0x60 [xfs] Dec 30 18:05:56 localhost kernel: [__get_free_pages+51/64] __get_free_pages+0x33/0x40 Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+2535/229974] xfs_da_read_buf+0x58/0x60 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+33261/229974] xfs_dir2_leaf_lookup_int+0x5e/0x2c0 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+33261/229974] xfs_dir2_leaf_lookup_int+0x5e/0x2c0 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+691/229974] xfs_da_do_buf+0x2a4/0x920 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_pnp_activate_dev+30238/229974] xfs_dir2_leaf_getdents+0x3bf/0xc50 [xfs] Dec 30 18:05:56 localhost kernel: [__crc_sysfs_create_dir+282719/339691] xfs_bmap_last_offset+0xc5/0x130 [xfs] .... 標準出力の代わりに、ファイル file へ書き出す。 conv=notrunc が与えられな い限り、 dd はファイル file を (訳注: コピー前に) 0 バイト ( も し く は seek= で指定されたサイズ) に切り詰める。 conv=CONVERSION[,CONVERSION]... 引 き数 CONVERSION で指定されたファイル変換を行う。(コンマの前後にスペー スを置かない。) notrunc 出 力ファイルを切り詰めない。 (訳注: 書き込み前の切り詰めを行わず 、そのまま先頭バイトから書き込みを行います。入力ファイルと出力 フ ァイルが同じ場合にファイルが壊れません。) dd if=sda.bin of=/dev/sda conv=notrunc sudo dd if=sda_head.bin of=/dev/sda conv=notrunc && sudo dd if=sdb_head.bin of=/dev/sdb conv=notrunc && sudo dd if=sdc_head.bin of=/dev/sdc conv=notrunc [nickle@itefu ~/raidtools-0.95-raidreconf]% sudo dd if=sda.bin of=/dev/sda conv=notrunc Password: 読み込んだブロック数は 9935104+0 書き込んだブロック数は 9935104+0 5086773248 bytes transferred in 523.311285 seconds (9720358 bytes/sec) [nickle@itefu ~/raidtools-0.95-raidreconf]% sudo dd if=sdb.bin of=/dev/sdb conv=notrunc && sudo dd if=sdc.bin of=/dev/sdc conv=notrunc 読み込んだブロック数は 9934976+0 書き込んだブロック数は 9934976+0 5086707712 bytes transferred in 863.324617 seconds (5891999 bytes/sec) 読み込んだブロック数は 9935104+0 書き込んだブロック数は 9935104+0 5086773248 bytes transferred in 468.618072 seconds (10854838 bytes/sec) [nickle@itefu ~/raidtools-0.95-raidreconf]% sudo dd if=sda.bin of=/dev/sda1 conv=notrunc && \ sudo dd if=sdb.bin of=/dev/sdb1 conv=notrunc && \ sudo dd if=sdc.bin of=/dev/sdc1 conv=notrunc sudo xfs_repair -n /dev/md0 alias od='od -Ax -tx1' Working (-) [00051175/07631122] [ 51175 : 15:03 125795 : 15:13 260111 : 15:32 490367 : 16:03 1987031 : 19:36 2865415 : 21:35 125795 - 51175 = 74620 260111 - 51175 = 208936 490367 - 51175 = 439192 1987031 - 51175 = 1935856 7631122 / 74620 = 102.26644331278477 7631122 / 208936 = 36.52372975456599 7631122 / 439192 = 17.37536658226926 29 * 37 / 60 = 17.883333333333333 10 * 103 / 60 = 17.166666666666668 1935856 / 273 = 7091.047619047619 (2865415 - 51175) / 392 = 7179.183673469388 (7631122 - 490367) / 439192 = 16.258845789540792 (7631122 - 1923064) / 7091.047619047619 = 804.9668126141613 (7631122 - 2865415) / 7179.183673469388 = 663.8229660583319 804.9668126141613 / 60 = 13.416113543569356
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Last-modified: 2014-12-24(水) 16:49:50