Unable to replace drive in software RAID-5 array (Fedora 14)

[leigh123linux]

Try

mount -r -t ext4 /dev/md127 /home/meg/RAID/

and post

dmesg | tail

[Tamater]

Holy ****, that mounted it!

[root@spectrum ~]# mount -r -t ext4 /dev/md127 /home/meg/RAID/
[root@spectrum ~]# cd /home/meg/RAID
[root@spectrum RAID]# ls
Bilingual_Verb_Gen_Backup      lost+found                 SSI
CHL_Testing                    Matt's_Home_Folder_Backup  SSI_MRIs
Clinical_Motor_Mapping_Backup  MEG-58
kadis_new_paeds                Negar_Backup
[root@spectrum RAID]# dmesg | tail
[   25.737457] eth0: no IPv6 routers present
[  916.202370] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[  916.202393] EXT4-fs (md127): group descriptors corrupted!
[ 1099.391460] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[ 1099.391482] EXT4-fs (md127): group descriptors corrupted!
[ 3489.977736] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[ 3489.977755] EXT4-fs (md127): group descriptors corrupted!
[ 6944.547837] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[ 6944.547861] EXT4-fs (md127): group descriptors corrupted!
[264163.783610] EXT4-fs (md127): mounted filesystem with ordered data mode. Opts: (null)

---------- Post added at 11:18 AM ---------- Previous post was at 11:07 AM ----------

forgive me, but, before I do anything else. I'm going to copy about 100GB of stuff from it that has no other backup.....it did give me a weird error when trying to copy....like it couldn't read from a particular folder with these weird symbols as an error msg....

It is still "preparing to copy" (up to 22 million files now....lol)

---------- Post added at 11:39 AM ---------- Previous post was at 11:18 AM ----------

Ok, I think there's a problem. The "Preparing to copy went up to about 55 million files before I stopped it....there are not that many files here.....I started looking in directories, and there are definitely things missing.... There are other random empty folders...damn

---------- Post added at 12:11 PM ---------- Previous post was at 11:39 AM ----------

Ok, well that problem was with one particular folder.....I've managed to copy most of it off folder by folder with only that one and one other with obvious copy errors.....there may be other stuff missing, but it is hard to tell.

Is there anything I can do to the FS to fix these errors?

[leigh123linux]

Originally Posted by Tamater

Holy ****, that mounted it!

[root@spectrum ~]# mount -r -t ext4 /dev/md127 /home/meg/RAID/
[root@spectrum ~]# cd /home/meg/RAID
[root@spectrum RAID]# ls
Bilingual_Verb_Gen_Backup      lost+found                 SSI
CHL_Testing                    Matt's_Home_Folder_Backup  SSI_MRIs
Clinical_Motor_Mapping_Backup  MEG-58
kadis_new_paeds                Negar_Backup
[root@spectrum RAID]# dmesg | tail
[   25.737457] eth0: no IPv6 routers present
[  916.202370] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[  916.202393] EXT4-fs (md127): group descriptors corrupted!
[ 1099.391460] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[ 1099.391482] EXT4-fs (md127): group descriptors corrupted!
[ 3489.977736] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[ 3489.977755] EXT4-fs (md127): group descriptors corrupted!
[ 6944.547837] EXT4-fs (md127): ext4_check_descriptors: Checksum for group 32640 failed (56927!=6895)
[ 6944.547861] EXT4-fs (md127): group descriptors corrupted!
[264163.783610] EXT4-fs (md127): mounted filesystem with ordered data mode. Opts: (null)

---------- Post added at 11:18 AM ---------- Previous post was at 11:07 AM ----------

forgive me, but, before I do anything else. I'm going to copy about 100GB of stuff from it that has no other backup.....it did give me a weird error when trying to copy....like it couldn't read from a particular folder with these weird symbols as an error msg....

It is still "preparing to copy" (up to 22 million files now....lol)

---------- Post added at 11:39 AM ---------- Previous post was at 11:18 AM ----------

Ok, I think there's a problem. The "Preparing to copy went up to about 55 million files before I stopped it....there are not that many files here.....I started looking in directories, and there are definitely things missing.... There are other random empty folders...damn

---------- Post added at 12:11 PM ---------- Previous post was at 11:39 AM ----------

Ok, well that problem was with one particular folder.....I've managed to copy most of it off folder by folder with only that one and one other with obvious copy errors.....there may be other stuff missing, but it is hard to tell.

Is there anything I can do to the FS to fix these errors?

I don't know how to fix it.

[Tamater]

Ok, well, to be honest. I'm getting most of the data that I need off of it....only a few things aren't copying. I'll have to be happy with that and wipe the whole thing and make a new RAID.


Thanks for all of your help. I really appreciate it.....even just to get this stuff I've gotten today from it... LIFESAVER!

[leigh123linux]

Did you check the lost+found directory?
It might be worth running photorec to see if you can recover the missing files.

http://www.cgsecurity.org/wiki/PhotoRec

it's part of the testdisk package

yum install testdisk

[Tamater]

What choice should I make here?

PhotoRec 6.12, Data Recovery Utility, May 2011
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org


Disk /dev/md127 - 6001 GB / 5589 GiB (RO)

Please select the partition table type, press Enter when done.
 [Intel  ] Intel/PC partition
 [EFI GPT] EFI GPT partition map (Mac i386, some x86_64...)
 [Humax  ] Humax partition table
 [Mac    ] Apple partition map
>[None   ] Non partitioned media
 [Sun    ] Sun Solaris partition
 [XBox   ] XBox partition
 [Return ] Return to disk selection




Note: Do NOT select 'None' for media with only a single partition. It's very
rare for a drive to be 'Non-partitioned'.

---------- Post added at 11:57 AM ---------- Previous post was at 11:57 AM ----------

I'm thinking Intel, but just want to make sure.

[leigh123linux]

Originally Posted by Tamater

What choice should I make here?

PhotoRec 6.12, Data Recovery Utility, May 2011
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org


Disk /dev/md127 - 6001 GB / 5589 GiB (RO)

Please select the partition table type, press Enter when done.
 [Intel  ] Intel/PC partition
 [EFI GPT] EFI GPT partition map (Mac i386, some x86_64...)
 [Humax  ] Humax partition table
 [Mac    ] Apple partition map
>[None   ] Non partitioned media
 [Sun    ] Sun Solaris partition
 [XBox   ] XBox partition
 [Return ] Return to disk selection




Note: Do NOT select 'None' for media with only a single partition. It's very
rare for a drive to be 'Non-partitioned'.

---------- Post added at 11:57 AM ---------- Previous post was at 11:57 AM ----------

I'm thinking Intel, but just want to make sure.

I think intel is the correct choice.