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Please help to determine,

how to may fix this XFS filesystem and whats actually wrong?

Thanks!

An XFS image runs productive mounted -o loop on debian. a million of files are read every day, only some are written in batches every few days.

/dev/cciss/c0d9      1953449048 1950392335   3056714 100% /website
/dev/loop0  1950358937 1937866163  12492775 100% /var/www/website

a single, nearly full 2TB drive, 100% load on the arm since 2-3 years (behind a raid controller,smart invisible)

/website ls -ls
1997201106024 Apr 29 12:33 website.image
/var/www/website  ls|wc -l
480173 

480k subdirectories in an nearly full image

at high work load and while moving some files (usually the files are only read but not written) the website.image already said bye a few times and the machine was rebooted

now suddenly:

/var/www/website  ls|wc -l
input / output error
134181

yet sometimes it can be mounted sometimes sais bad superblock but when it can be mounted then again only able to show the 134181 directories.

xfs_repair website.image stops after some minutes scanning a certain inode
xfs_repair -L same

-i forgot the -f "drive is a file" first - does it matter?

xfs_repair /dev/cciss/c0d9  finishes properly in a second.

dd_rescue for website.image
has 50% after 12 hours and skipped 3500 512 byte blocks
(not too much i guess? - can i resume dd_rescue or do i need to convert the log into gddrescue first?)

But dd for /dev/cciss/c0d9 seems to run full speed without errors.

 xfs_info /dev/cciss/c0d9
meta-data=/dev/cciss/c0d9        isize=256    agcount=4, agsize=976740908 blks
         =                       sectsz=512   attr=2
data     =                       bsize=512    blocks=3906963632, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=16384  ascii-ci=0
log      =internal               bsize=512    blocks=65536, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
share|improve this question
    
Why are you using a loop-mounted filesystem? –  ewwhite Apr 29 '13 at 23:33
    
It is an image file since one day it had to be moved to another server in 5 hours rather then waiting a week to move all the files, since then it amazingly kept working mounted as loop for many years. (until now :(...) –  jonas Apr 30 '13 at 2:21
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