[Voyage-linux] ext2 file system being remounted every 5 minutes

[Jeff Ramin]

Here's a little more info regarding the file system in question...you'll 
notice
the last write time below is 5 minutes ago, but the last mount time was
when the machine was booted?

Can somebody explain that? How can the FS have been written to without
being mounted?


root# tune2fs -l /dev/hda1
tune2fs 1.41.3 (12-Oct-2008)
Filesystem volume name:   ROOT_FS
Last mounted on: <not available>
Filesystem UUID:          995744b8-7193-4799-b40d-89c265dcf07a
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      ext_attr resize_inode dir_index filetype 
sparse_super large_file
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         not clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              232928
Block count:              931384
Reserved block count:     9313
Free blocks:              764434
Free inodes:              201548
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      227
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8032
Inode blocks per group:   502
Filesystem created:       Thu Apr 21 11:17:14 2011
Last mount time:          Fri Apr 22 14:52:56 2011
Last write time:          Mon Apr 25 15:46:24 2011
Mount count:              1281
Maximum mount count:      -1
Last checked:             Thu Apr 21 11:17:14 2011
Check interval:           15552000 (6 months)
Next check after:         Tue Oct 18 11:17:14 2011
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Default directory hash:   half_md4
Directory Hash Seed:      8d3fd677-c542-4a98-9e93-f1c288036231


On 04/25/2011 03:41 PM, Jeff Ramin wrote:
>
> Thanks for the suggestion, but mounting w/ the noatime option doesn't
> affect the behavior.
>
> Anybody else have an idea?
>
>
> On 04/25/2011 03:03 PM, Michael Steinmann wrote:
>> hi,
>>
>> maybe changing relatime to noatime could help?
>> see 
>> http://linux.koolsolutions.com/2009/01/30/installing-linux-on-usb-part-4-noatime-and-relatime-mount-options/ 
>> :
>> *
>> 2. noatime* – This option stops recording the last file access time 
>> when the file is just read. The /noatime/ option eliminates all the 
>> writes to the disk each time a file was just read which previously 
>> used to happen with /atime/. However a write is made to a disk in 
>> case if a file is being changed/written.
>>
>> cheers,
>> michael
>>
>> 2011/4/25 Jeff Ramin <jeff.ramin at singlewire.com 
>> <mailto:jeff.ramin at singlewire.com>>
>>
>>
>>     Hi folks.
>>
>>     I have since switched to ext2 since my original message below,
>>     yet I am
>>     still seeing the same behavior - / is being remounted every 5
>>     minutes. I want
>>     to avoid this, to save wear & tear on the compact flash card.
>>
>>     Nothing in cron would be causing this...any ideas? I'm running
>>     voyage 0.6.5,
>>     and the file system is mounted thus (ouput from mount command):
>>
>>     /dev/disk/by-label/ROOT_FS / ext2 ro,relatime,errors=continue 0 0
>>
>>     Thanks.
>>
>>
>>     ---------- Forwarded message ----------
>>     From: Gustin Johnson <[hidden email]
>>     <http://voyage-linux.34677.n3.nabble.com/user/SendEmail.jtp?type=node&node=2661075&i=0&by-user=t>>
>>     Date: Thu, Mar 10, 2011 at 9:17 AM
>>     Subject: Re: [*Voyage*-linux] root being
>>     remounted*every**5**minutes*?
>>     To: Jeff Ramin <[hidden email]
>>     <http://voyage-linux.34677.n3.nabble.com/user/SendEmail.jtp?type=node&node=2661075&i=1&by-user=t>>
>>
>>
>>     My first guess is that writing to the journal on EXT3 requires the FS
>>     to be writable.  We use EXT2 on all of our flash based media to
>>     minimize the number of writes.
>>
>>     We once had a similar issue but it was an incorrectly formatted cron
>>     entry.  We have a custom script that remounts the FS as writable,
>>     then
>>     does an aptitude update, package download, and simulates an install,
>>     then emails the results.  The error in crontab caused this to be run
>>     *every**5**minutes*instead of once a day.
>>
>>     On Thu, Mar 10, 2011 at 7:47 AM, Jeff Ramin <[hidden email]
>>     <http://voyage-linux.34677.n3.nabble.com/user/SendEmail.jtp?type=node&node=2661075&i=2&by-user=t>>
>>     wrote:
>>
>>     >
>>     > I have*voyage*0.6.*5*running on an Alix board, and I'm seeing / get
>>     > remounted*every**5**minutes*, like so:
>>     >
>>     > Mar 10 08:10:*54*singlewire*vmunix*: [603042.739714] EXT3 FS on
>>     hda1, internal
>>     > journal
>>     > Mar 10 08:15:*56*singlewire*vmunix*: [603344.099594] EXT3 FS on
>>     hda1, internal
>>     > journal
>>     > Mar 10 08:21:06 singlewire*vmunix*: [603653.940611] EXT3 FS on
>>     hda1, internal
>>
>>
>>
>>     -- 
>>     Jeff Ramin
>>     Software Engineer
>>     Singlewire Software
>>     2601 W Beltline Hwy #510
>>     Madison, WI 53713
>>
>>     Phone Direct - 608.661.1172
>>     www.singlewire.com  <http://www.singlewire.com>
>>
>>
>>     _______________________________________________
>>     Voyage-linux mailing list
>>     Voyage-linux at list.voyage.hk <mailto:Voyage-linux at list.voyage.hk>
>>     http://list.voyage.hk/mailman/listinfo/voyage-linux
>>
>>
>
>
> -- 
> Jeff Ramin
> Software Engineer
> Singlewire Software
> 2601 W Beltline Hwy #510
> Madison, WI 53713
>
> Phone Direct - 608.661.1172
> www.singlewire.com


-- 
Jeff Ramin
Software Engineer
Singlewire Software
2601 W Beltline Hwy #510
Madison, WI 53713

Phone Direct - 608.661.1172
www.singlewire.com

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