Linux Server Details

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====== Check_when_a_fsck_is_due ======

Note: this is for Debian/Ubuntu Systems.

When applying kernel upgrades, typically a reboot is required. Typically a FSCK (disk check) is scheuled every 6 months (or number of mount times). A fsck can take quite a long time to scan the disks to see if there are any errors, especially with large disks. Wouldn't it be nice to know if a fsck will happen at the next reboot? And then you can plan for more downtime.

 tune2fs -l /dev/sda1

It tells you when the next fsck will be run (Next check after:). See below for an example.

 twister:~# tune2fs -l /dev/sda1
 tune2fs 1.41.3 (12-Oct-2008)
 Filesystem volume name:   <none>
 Last mounted on:          <not available>
 Filesystem UUID:          451286b3-e9b0-43fe-8684-7fbc1dc611ed
 Filesystem magic number:  0xEF53
 Filesystem revision #:    1 (dynamic)
 Filesystem features:      has_journal filetype needs_recovery sparse_super
 Default mount options:    (none)
 Filesystem state:         clean
 Errors behavior:          Continue
 Filesystem OS type:       Linux
 Inode count:              393216
 Block count:              786432
 Reserved block count:     31457
 Free blocks:              370519
 Free inodes:              326179
 First block:              0
 Block size:               4096
 Fragment size:            4096
 Blocks per group:         32768
 Fragments per group:      32768
 Inodes per group:         16384
 Inode blocks per group:   512
 Filesystem created:       Tue Sep 12 17:23:59 2006
 Last mount time:          Wed Apr 29 23:02:37 2009
 Last write time:          Wed Apr 29 23:02:37 2009
 Mount count:              5
 Maximum mount count:      32
 Last checked:             Fri Jan 30 08:28:42 2009
 Check interval:           15552000 (6 months)
 Next check after:         Wed Jul 29 09:28:42 2009
 Reserved blocks uid:      0 (user root)
 Reserved blocks gid:      0 (group root)
 First inode:              11
 Inode size:               128
 Journal inode:            8
 First orphan inode:       182499
 Default directory hash:   tea
 Directory Hash Seed:      1602904f-b5d3-4e6b-aac2-2e9b3a9964da
 Journal backup:           inode blocks