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http://hiro-system.blog.ocn.ne.jp/blog/2010/11/smartd_995c.html
http://www.wizard-limit.net/mt/pc/archives/2011_08.html
grep -i "smartd" /var/log/messages | tail
guard# grep -i "smartd" /var/log/messages | tail Feb 14 05:57:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 06:27:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 06:57:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 07:27:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 07:57:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 08:27:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 08:57:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 09:27:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 09:57:57 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors Feb 14 10:27:56 guard smartd[779]: Device: /dev/ad4, 1 Currently unreadable (pending) sectors guard#
guard# smartctl /dev/ad4 --log=selftest smartctl 5.43 2012-06-30 r3573 [FreeBSD 8.1-RELEASE-p13 i386] (local build) Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net === START OF READ SMART DATA SECTION === SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Short offline Completed: read failure 90% 19379 310658987 # 2 Short offline Completed: read failure 90% 19355 310658987 # 3 Short offline Completed: read failure 90% 19331 310658987 # 4 Short offline Completed: read failure 90% 19307 310658987 # 5 Short offline Completed: read failure 90% 19283 310658987 # 6 Extended offline Completed: read failure 90% 19263 310658987 # 7 Short offline Completed: read failure 90% 19259 310658987 # 8 Short offline Completed: read failure 90% 19235 310658987 # 9 Short offline Completed: read failure 90% 19211 310658987 #10 Short offline Completed: read failure 90% 19187 310658987 #11 Short offline Completed: read failure 90% 19163 310658987 #12 Short offline Completed: read failure 90% 19139 310658987 #13 Short offline Completed: read failure 90% 19115 310658987 #14 Extended offline Completed: read failure 90% 19095 310658987 #15 Short offline Completed: read failure 90% 19091 310658987 #16 Short offline Completed: read failure 90% 19067 310658987 #17 Short offline Completed: read failure 90% 19043 310658987 #18 Short offline Completed: read failure 90% 19019 310658987 #19 Short offline Completed: read failure 90% 18995 310658987 #20 Short offline Completed: read failure 90% 18971 310658987 #21 Short offline Completed: read failure 90% 18947 310658987 guard#
30 2 * * * root /root/bin/backup_to_k222_all.sh 30 0 * * * root /root/bin/backup_to_BlackHole_all.sh
# smartctl /dev/sdz --log=selftest smartctl version x.xx Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF READ SMART DATA SECTION === SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Short offline Completed: read failure 10% 19935 1043624 # 2 Extended offline Completed without error 00% 18472 - # 3 Short offline Completed without error 00% 18469 - # 4 Extended offline Completed without error 00% 18447 - # 5 Extended offline Completed without error 00% 16669 - # 6 Short offline Completed without error 00% 16645 - # 7 Extended offline Completed without error 00% 13278 - # 8 Short offline Completed without error 00% 12081 -
guard# fdisk
******* Working on device /dev/ad4 *******
parameters extracted from in-core disklabel are:
cylinders=310020 heads=16 sectors/track=63 (1008 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=310020 heads=16 sectors/track=63 (1008 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
start 63, size 312496317 (152586 Meg), flag 80 (active)
beg: cyl 0/ head 1/ sector 1;
end: cyl 1023/ head 3/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
guard#
guard# disklabel -A /dev/ad4s1 # /dev/ad4s1: type: ESDI disk: ad4s1 label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 16 sectors/cylinder: 1008 cylinders: 310020 sectors/unit: 312500160 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] a: 1048576 0 4.2BSD 0 0 0 b: 4092240 1048576 swap c: 312496317 0 unused 0 0 # "raw" part, don't edit d: 4143104 5140816 4.2BSD 0 0 0 e: 1048576 9283920 4.2BSD 0 0 0 f: 302163821 10332496 4.2BSD 0 0 0 disklabel: partition c doesn't cover the whole unit! disklabel: An incorrect partition c may cause problems for standard system utilities guard#
ということで、bsize が０となってしまう・・・？
# dumpfs /some/filesystem | grep '^bsize'
ということなので、
guard# dumpfs /dev/ad4s1 | grep '^bsize' bsize 16384 shift 14 mask 0xffffc000
guard# stat 100728576 88 crw--w---- 1 root tty 88 0 "Feb 14 12:47:16 2013" "Feb 14 12:47:16 2013" "Feb 14 12:47:16 2013" "Jan 1 08:59:59 1970" 4096 0 0 /dev/pts/1 guard# stat w-filter_1_02.sh 80 16587 -rwxr-xr-x 1 root wheel 68531 1776 "Jan 12 14:00:52 2012" "Apr 27 14:46:06 2007" "Nov 15 11:53:50 2010" "Apr 27 14:46:06 2007" 16384 4 0 w-filter_1_02.sh
http://d.hatena.ne.jp/parasporospa/touch/searchdiary?word=*%5Bunix%5D&of=20
によれば、st_blksize ファイルシステム I/O 操作での最適なブロックサイズ は、16384
http://hiro-system.blog.ocn.ne.jp/blog/2010/11/smartd_995c.html
では、以下の様な公式が掲載されていますが、これはFreeBSDだとそのままでは当てはまりません。
b = (int)((L-S)*512/B)
where:
b = File System block number
B = File system block size in bytes
L = LBA of bad sector
S = Starting sector of partition as shown by fdisk -lu
and (int) denotes the integer part.
S = 0、B = 4096、L = 1043624を公式に代入。
b = (int)(1043624 * 512 / 4096) = (int) 130453 (小数点以下切捨)
で、こちらとなります。
b = (int)((L-S)*512/B)
where:
b = File System block number
B = File system block size in bytes (dumpfs 16384)
L = LBA of bad sector
S = Starting sector of partition as shown by fdisk
and (int) denotes the integer part.
S = 0、B = 16384、L = 310658987を公式に代入。
b = (int)(310658987 * 512 / 16384) = (int) 9708093.34375 (小数点以下切捨)
となった。該当箇所をddでゼロで埋める。
# dd if=/dev/zero of=/dev/sdz bs=4096 count=1 seek=130453 ⇒ dd if=/dev/zero of=/dev/ad4 bs=16384 count=1 seek=9708093 1+0 records in 1+0 records out 4096 bytes (4.1 kB) copied, 0.000270448 s, 43.8 MB/s
そして、正常にもどったかどうかチェック！
# smartctl –-test=long /dev/sdz
･･･数時間経過後。
# smartctl –-log=selftest /dev/sdz smartctl version x.xx Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF READ SMART DATA SECTION === SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 19937 - # 2 Short offline Completed: read failure 10% 19935 1043624 # 3 Extended offline Completed without error 00% 18472 - # 4 Short offline Completed without error 00% 18469 - # 5 Extended offline Completed without error 00% 18447 - # 6 Extended offline Completed without error 00% 16669 - # 7 Short offline Completed without error 00% 16645 - # 8 Extended offline Completed without error 00% 13278 - # 9 Short offline Completed without error 00% 12081 -
以上。
