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Re: Fedroa 10 Wedges File System under heavy I/O Load



Chuck Forsberg WA7KGX N2469R wrote:
>  From time to time I back up data from /u, /y, and /var onto
> an external IDE HD attached with a USB interface as /dev/sde1.
> The command used is:  cd /; find u y var -print | cpio -pmd /b
> This has worked well until recently.
> 
> Now Fedora "wedges" the /u file system at some time during this
> backup process, which takes about three hours.  If /u doesn't
> wedge before the backup finished with /u, the backup runs
> to completion.
> 
> Strangely enough, even when /u is wedged, other file systems
> on the same drive typically work normally.  Commands such
> as sync and ps -ef wedge, but df does not.
> 
> Any ideas what to look for??

Please include the kernel version in reports like this, as well as any
kernel messages that might be relevant... there was one deadlock in ext4
fixed recently, so it'd be nice to know what you're running.

You could run iostat to see if any IO is going to the usb drive or not.

When thing seem deadlocked, echo w > /proc/sysrq-trigger will dump out
all blocked processes to the kernel logs; you can then dmesg > file and
attach that to any bug report.

Feel free to just file bugs for stuff like this, too.

Thanks,
-Eric

> Signed - "Wedged in Portland"
> 
> /dev/sdb3 on / type ext4 (rw)
> /proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> devpts on /dev/pts type devpts (rw,gid=5,mode=620)
> /dev/sda1 on /oldroot type ext4 (rw)
> /dev/sdb7 on /x type ext4 (rw)
> /dev/sdb2 on /y type ext4 (rw)
> /dev/sda3 on /v type ext4 (rw)
> /dev/sdb5 on /u type ext4 (rw)
> /dev/sdb1 on /boot type ext2 (rw)
> tmpfs on /dev/shm type tmpfs (rw)
> /dev/sdc3 on /w type ext4 (rw)
> /dev/sdd2 on /z type ext4 (rw)
> 


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