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FreeBSD 8.2+ZFSã§ã€ã„ã¤ã‚‚決ã¾ã£ãŸã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§Kernel PanicãŒç™ºç”Ÿã—ã¦ã„るよã†ã«è¦‹ãˆã¾ã™ã€‚何ã¨ã‹ãªã‚‰ãªã„ã§ã—ょã†ã‹? 
FreeBSD+ZFS(RAID5)ã§è‡ªå®…鯖兼NASを構築ã—ã¦ã„ã¾ã™ã€‚
巨大ãªãƒ•ã‚¡ã‚¤ãƒ«(æ•°G)ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚’コピーã—ãŸã‚Šã—ã¦ã„ã¾ã™ãŒã€çœŸå¤œä¸­ã®æ±ºã¾ã£ãŸã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§ã‚«ãƒ¼ãƒãƒ«ãƒ¡ãƒ¢ãƒªä¸è¶³ã«ã‚ˆã‚‹Kernel PanicãŒèµ·ã“ã£ã¦ã—ã¾ã„ã¾ã™ã€‚
時刻ã¯ç›£è¦–ã—ã¦ã„ã¾ã›ã‚“ãŒã€å¤œä¸­3~4時頃ã¨æ€ã‚ã‚Œã¾ã™ã€‚
ã“ã®å‰ã‚³ãƒ”ーãŒåŽŸå› ã‹ã¨æ€ã£ã¦ã‚³ãƒ”ーを止ã‚ã¦æ”¾ç½®ã—ãŸã¨ã“ã‚ã€ã‚„ã¯ã‚Šå¤œä¸­ã«åŒã˜ç†ç”±ã§Kernel Panicã‚’èµ·ã“ã—ã¾ã—ãŸã€‚

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Sambaã‚‚ã€ãƒ©ã‚¤ãƒˆã‚­ãƒ£ãƒƒã‚·ãƒ¥ã‚’切ã£ã¦ãŠã‚Šã€å·¨å¤§ãªãƒ‡ãƒ¼ã‚¿ãŒRAIDã«ä¸€æ°—ã«æµã‚Œè¾¼ã¾ãªã„よã†ã«ã—ã¦ã„ã¾ã™ã€‚
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/boot/loader.confã®å†…容:
zfs_load="YES"
vm_kmem_size="1536M"
vm_kmem_size_max="1536M"
vfs.zfs.arc_max="1024M"
vfs.zfs.vdev.cache.size="128M"
vfs.zfs.prefetch_disable="1"

ã“ã‚Œã§å¤œä¸­ã«è½ã¡ã‚‹ã‹ã‚‰è¨³ã‚ã‹ã‚‰ãªã„ã®ã§ã™ã€‚

ã“れ以上カーãƒãƒ«ãƒ¡ãƒ¢ãƒªã‚’増やã™ã¨ãªã‚‹ã¨ã€ä»–ã®ã‚¢ãƒ—リã«å½±éŸ¿ãŒå‡ºãªã„ã‹å¿ƒé…ã§ã™ã€‚
æ­è¼‰ã—ã¦ã„る物ç†ãƒ¡ãƒ¢ãƒªã¯4Gã§ã€CPUã¯Atom D525ã§ã™(ã¤ã¾ã‚Šã“れ以上増やã›ãªã„)。

Panic時ã«å‡ºã¦ã„ãŸç”»é¢ã¯ä»¥ä¸‹ã§ã™(ã™ã„ã¾ã›ã‚“ã€ç”»é¢ã‚’写真ã«æ’®ã£ãŸã®ã‚’OCRã«ã‹ã‘ãŸã‚‚ã®ãªã®ã§ãŠã‹ã—ãªã¨ã“ã‚ãŒã‚ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“)。

login: panic: kmem_malloc (36864): kmem_map too small: 335376384 total 
allocated cpuid = 1
KDB: stack backtrace:
#0 0x88746667 at kdb_backtrace+0x47
#1 8x88717727 at panic+0x117
#2 8x889778fa at kmem_malloc+0x28a
#3 8x8896bel7 at page_alloc+0x27
#4 8x8896e8c8 at uma_large_malloc+0x58
#5 8x88784438 at malloc+8x89
#6 8x88e9fe68 at zfs_kmem_alloc+0x28
#7 8x88de9b85 at zio_buf_alloc+0x45
#8 8x88d836el at arc_get.data_buf+0x6f1
#9 8x88d8647b at arc_read_nolock+0x25b
#10 8x88d86c28 at arc_read+0x78
#11 8x88d8a2f3 at dbuf_read+0x5a3
#12 8x88d8e82a at dmu_buf_hold+0xea
#13 8x88ddca2a at zap_lockdir+0x4a
#14 8x88dddccf at zap_lookup_norm+0x4f
#15 8x88ddde59 at zap_lookup+0x69
#16 8x88df772f at zfs_dirent_lock+0x58f
#17 8x88df794c at zfs_dirlook+0x6c
Uptime: 15h53m12s
Cannot dump. Device not defined or unavailable.
Automatic reboot in 15 seconds - press a key on the console to abort

gpart showã®çµæžœã¯ä»¥ä¸‹ã§ã™ã€‚
2.7Tã®ãƒ‘ーティションを6ã¤çµ„ã¿åˆã‚ã›ã¦RAID-Zã«ã—ã¦ã„ã¾ã™ã€‚

=>        34  5860533101  ad4  GPT  (2.7T)
          34         128    1  freebsd-boot  (64K)
         162     2097024    2  freebsd-ufs  (1.0G)
     2097186     8388608    3  freebsd-swap  (4.0G)
    10485794    14616756    4  freebsd-ufs  (7.0G)
    25102550     2077152    5  freebsd-ufs  (1.0G)
    27179702    77677932    6  freebsd-ufs  (37G)
   104857634  5755675501    7  freebsd-zfs  (2.7T)

=>        34  5860533101  ad5  GPT  (2.7T)
          34   104857600    1  freebsd-ufs  (50G)
   104857634  5755675501    2  freebsd-zfs  (2.7T)

=>        34  5860533101  ad6  GPT  (2.7T)
          34   104857600    1  freebsd-ufs  (50G)
   104857634  5755675501    2  freebsd-zfs  (2.7T)

=>        34  5860533101  ad7  GPT  (2.7T)
          34   104857600    1  freebsd-ufs  (50G)
   104857634  5755675501    2  freebsd-zfs  (2.7T)

=>        34  5860533101  ad8  GPT  (2.7T)
          34   104857600    1  freebsd-ufs  (50G)
   104857634  5755675501    2  freebsd-zfs  (2.7T)

=>        34  5860533101  ad10  GPT  (2.7T)
          34   104857600     1  freebsd-ufs  (50G)
   104857634  5755675501     2  freebsd-zfs  (2.7T)

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