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linux - How to recover data from a corrupted ext3 partition?

A server of mine had a drive failure of some sort which
caused the OS (CentOS 5) to crash and stop working (it refuses to
boot).



So we put another drive with a working OS
and from there we try to mount the partitions in the old
drive.



Most partitions mount fine except for
one: the /var partition, where my MySQL tables reside. />When I try to mount that one, I see these errors with
dmesg:






sd 0:0:1:0: Unhandled sense code
sd 0:0:1:0: SCSI error: return code
= 0x08100002
Result: hostbyte=invalid
driverbyte=DRIVER_SENSE,SUGGEST_OK
sdb: Current: sense key: Medium
Error
Add. Sense: Unrecovered read error




Info fld=0x4a47e
JBD: Failed to read block at offset 9863 />JBD: recovery failed
EXT3-fs: error loading
journal.




Is there
a way I can recover the data in that partition?



/>


EDIT: />As requested, the output of tune2fs -l /dev/sdb2
is:



tune2fs 1.39
            (29-May-2006)
Filesystem volume name: /var1
Last mounted on:             available>
Filesystem UUID:
            d84f5181-24f3-40ce-9eaa-601ae5ae33bd
Filesystem magic number:
            0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features:
            has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super
            large_file
Default mount options: user_xattr
            acl

Filesystem state: clean
Errors behavior:
            Continue
Filesystem OS type: Linux
Inode count:
            26214400
Block count: 26214063
Reserved block count:
            1310703
Free blocks: 25127226
Free inodes: 26213665
First
            block: 0
Block size: 4096

Fragment size:
            4096
Reserved GDT blocks: 1017
Blocks per group:
            32768
Fragments per group: 32768
Inodes per group:
            32768
Inode blocks per group: 1024
Filesystem created: Thu May 13
            18:14:28 2010
Last mount time: Thu Nov 29 12:52:00 2012
Last write
            time: Wed Mar 27 20:29:28 2013
Mount count: 15

Maximum
            mount count: -1
Last checked: Thu May 13 18:14:28 2010
Check
            interval: 0 ()
Reserved blocks uid: 0 (user
            root)
Reserved blocks gid: 0 (group root)
First inode:
            11
Inode size: 128
Journal inode: 8
Default directory
            hash: tea
Directory Hash Seed:
            35f38c48-3933-4c99-bde2-63b0eccf200d

Journal backup: inode
            blocks


/>

EDIT 2:
As
suggested by @Hartmut, I run fsck.ext3 /dev/sdb2 with the
following result:



e2fsck 1.39
            (29-May-2006)
/var1: recovering journal
/var1: Attempt to read block
            from filesystem resulted in short read while reading block
            11931


JBD: Failed to read block at offset
            9863
fsck.ext3: No such device or address while trying to re-open
            /var1
e2fsck: io manager magic
            bad!

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