[CentOS] Repair Filesystem prompt , after inode has illegal blocks

[Les Mikesell]

Robert Heller wrote:
> At Mon, 14 Sep 2009 11:23:19 +1200 CentOS mailing list <centos at centos.org> wrote:
> 
>> Content-Language: en-US
>>
>>
>> hi All,
>>
>> A fault on our SAN dropped us down to a read-only filesystem and after reboot,
>> we have an "Unexpected Inconsistency" and I am being instructed by the boot to run fsck manually
>> without -a or -p  (this was after I think processing around 15% of the filesystem)
>>
>> The specific message is  "inode 27344909 has illegal blocks"
>>
>> I recall running fsck some years ago on smaller and simpler systems - am broadly
>> familiar with what it is but have no expertise in using it to repair a filesystem.
>>
>> Would be grateful for advice on whats the quickest / usual way to get us back up from
>> this. We do have a good backup for restoring unrecoverable files - i.e. I assume I am going
>> to end up  asking fsck to repair the filesystem itself and then clean up any mess that
>> results.
>>
>> This is fsck 1.39 , Linux version 2.6.18-92.1.18.el5 , Red Hat 4.1.2-42
>>
>> thanks for any tips.
> 
> Just run fsck and follow the prompts.  Do this in single user mode. I
> assume that this not a file system with the O/S itself on it (eg it is
> not / or /usr or /var, etc.) If it ends up asking to do massive
> repairs, it might be that the file system is totally fubar'ed, in which
> case, doing a mkfs and doing a complete restore might be what you have
> to do.  Be prepaired for this case. It is good that you have a good
> backup!

fsck -y will assume a 'yes' answer to all the prompts, which you might as well 
do unless you think you know more than fsck does about fixing the filesystem.

-- 
   Les Mikesell
    lesmikesell at gmail.com