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General => Developers => Topic started by: chrisbirkinshaw on April 11, 2009, 08:32:49 pm

Title: 0810: Internal disk drive constantly unmounted and remounted
Post by: chrisbirkinshaw on April 11, 2009, 08:32:49 pm

I am unable to transfer any files onto the second drive of my core, as it keeps getting unmounted. I ran the following command:

while [ true ] ; do echo "`date` : `df | grep sdb`" ; sleep 5 ; done

and get this output:

Code: [Select]

Sat Apr 11 19:27:32 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:27:38 BST 2009 :
Sat Apr 11 19:27:43 BST 2009 :
Sat Apr 11 19:27:48 BST 2009 :
Sat Apr 11 19:27:53 BST 2009 :
Sat Apr 11 19:27:58 BST 2009 :
Sat Apr 11 19:28:03 BST 2009 :
Sat Apr 11 19:28:08 BST 2009 :
Sat Apr 11 19:28:13 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /tmp/tmp.KryNc31477
Sat Apr 11 19:28:18 BST 2009 :
Sat Apr 11 19:28:23 BST 2009 :
Sat Apr 11 19:28:28 BST 2009 :
Sat Apr 11 19:28:33 BST 2009 :
Sat Apr 11 19:28:38 BST 2009 :
Sat Apr 11 19:28:43 BST 2009 :
Sat Apr 11 19:28:48 BST 2009 :
Sat Apr 11 19:28:53 BST 2009 :
Sat Apr 11 19:28:58 BST 2009 :
Sat Apr 11 19:29:03 BST 2009 :
Sat Apr 11 19:29:08 BST 2009 :
Sat Apr 11 19:29:13 BST 2009 :
Sat Apr 11 19:29:18 BST 2009 :
Sat Apr 11 19:29:23 BST 2009 :
Sat Apr 11 19:29:28 BST 2009 :
Sat Apr 11 19:29:33 BST 2009 :
Sat Apr 11 19:29:38 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:29:43 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:29:48 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:29:53 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:29:58 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:03 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:08 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:13 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:18 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
/dev/sdb1            961432072    204628 912389444   1% /tmp/tmp.NqdDbI1699
Sat Apr 11 19:30:23 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:28 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:33 BST 2009 : /dev/sdb1            961432072    204628 912389444   1% /mnt/device/28
Sat Apr 11 19:30:38 BST 2009 :


Is anyone aware of this? If not I will submit to Trac.

Regards,

Chris

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: tschak909 on April 11, 2009, 08:47:45 pm

This is normal.

It is caused by the automounter not detecting any open files or disk accesses to the mount, so it unmounts.

-Thom

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: chrisbirkinshaw on April 13, 2009, 05:33:08 pm

Why is it required? It seems that most of the time it is unmounted, so I am unable to start copying files to it.

Chris

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: tschak909 on April 13, 2009, 06:08:52 pm

This is required so that the disk can be swapped out, if it is external.

While it is not perfect, typically a read to the directory where the disk is symlinked is sufficient to bring it online.

-Thom

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: totallymaxed on April 14, 2009, 11:23:03 pm

Quote from: chrisbirkinshaw on April 13, 2009, 05:33:08 pm

Why is it required? It seems that most of the time it is unmounted, so I am unable to start copying files to it.

Chris

I agree this is a pain. We tend to create a detached screen session and ls into one of the subdirectories via the drives symlink. This keeps the drive mounted and available. Its a bit of a hack...but works ok as a temporary measure until we can come up with a more 'intelligent' automounter script.

Andrew

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: hari on April 14, 2009, 11:24:55 pm

ack, its a pita. I'd vote for a longer timeout.

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: hari on April 14, 2009, 11:25:30 pm

and while we are at it, a change from smbfs to nfs would be great.. any volunteers?

br, hari

Title: Re: 0810: Internal disk drive constantly unmounted and remounted
Post by: chrisbirkinshaw on April 16, 2009, 08:47:04 pm

I have found a problem where samba isn't following symlinks into my external drive. Have you seen this? Works ok on the box itself.