Synology & Fsck

[Charles Steinkuehler]

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On 6/2/2010 8:05 PM, Sean Crago wrote:
> Andrew:
> I'm assuming md0 is on one or more of my two disks, but still investigating
> whether this is safe to do. Researching mdadm-style software RAID is top of
> my list of things to do in 9-10 hours after work, but not comfortable
> popping it out just yet/not sure how to tell if this /dev/md0 device is only
> on one of my disks and not on both, or a third device/onboard flash.

What's in /proc/mdstat ?

This will tell you what sort of RAID device /dev/md0 is (likely a RAID1
mirror), and which devices it consists of.


> Is there a way to safely fix the problem on a live filesystem, due to
> Synology's custom distro ignoring tune2fs's check interval settings on boot?

You mentioned the ARM system won't boot from a USB device, but can it
see one once it's running?  If so (or if you've got enough ram or space
elsewhere), you can try to copy the existing OS files to a new location,
do a pivot_root, and then unmount/fsck the old (broken) root filesystem:

http://linux.die.net/man/8/pivot_root

Also, if you have any way to play with the kernel boot command line (ie:
alter the boot-loader settings), you might try some tricks like setting
init=/bin/sh.  You should then be able to fsck the root filesystem when
it's mounted read-only and there's very little running (ie: similar to
what most init scripts do check the root fs).

First, however, I'd look to see if there's a /forcefsck flag or similar
you can pass to the init scripts (ie: "touch /forcefsck" on a debian
based system, then reboot).  Look through the init scripts for anything
that runs fsck, and see if there's a way to force it into operation.

- -- 
Charles Steinkuehler
charles at steinkuehler.net
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