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Old 01-24-2011, 06:53 PM   #1
mudgie
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Registered: Dec 2001
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DMRAID - is there a live linux distro that can mount a fakeraid array?


I'm trying to rescue files from an Iomega NAS device that seems to be corrupted. This is the Storcenter rack-mount server - four 1tb drives, celeron, 1gb, etc. I'm hoping there's a live distro that would allow me to mount the RAID volume in order to determine if my files are accessible. Ubuntu 10.10 nearly got me there but reported "Not enough components available to start the RAID Array".

Thank you!

Steve
 
Old 01-24-2011, 09:32 PM   #2
xeleema
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Greetingz!

There's a few LiveCD's that have saved the proverbial bacon a few times for me;
Knoppix (grab the torrent)
SystemRescueCD (download page)
Hiren's Boot CD (you're going to have to google that one)
Gentoo Live CD (download link) DMraid+nVidiaRAID Howto

Hope some of this helps!
 
1 members found this post helpful.
Old 01-25-2011, 01:22 PM   #3
mudgie
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Quote:
Originally Posted by xeleema View Post
Greetingz!

There's a few LiveCD's that have saved the proverbial bacon a few times for me;
Knoppix (grab the torrent)
SystemRescueCD (download page)
Hiren's Boot CD (you're going to have to google that one)
Gentoo Live CD (download link) DMraid+nVidiaRAID Howto

Hope some of this helps!
I'm working with an older Knoppix (version 5) so I can see the four disks. Can anyone assist with possible DMRAID commands to mount it as an array? dmraid -a reports "No RAID disks". Same with -r and -s. I'd sure love to get this mounted so I can rescue the data before I reload the Iomega OS,
 
Old 01-25-2011, 03:04 PM   #4
xeleema
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@mudgie

I think its time for a few questions;
1) Which ioMega NAS device is this?
2) Can you find out the "version" of their software & firmware running on it?
3) Since you can boot Knoppix, what do you see drive-wise?
4) Have you tested the actual hard drives themselves to make sure they're still good?

Boot knoppix, and open a terminal as root. From there review the output from the following commands;
dmesg | grep sd[a-z]
and
dmesg | grep hd[a-z]

Once you know what device names you have, then just do the following on each device;
fdisk -l /dev/sd#
or
fdisk -l /dev/hd#
(We need to know the manufacturer, model, and size of each disk, as well as what partitions & partition-types are on each one)

Once you have that, then we can start doing "Read Tests";

WARNING: Do not get "if=" and "of=" below confused, you can destroy your data if you do!
1) Start tailing your logs;
tail -f /var/log/messages &
2) Perform a read-test on one entire disk.
time dd if=/dev/sdX# of=/dev/null &
Where X is a letter and # is a partition number (Examples: sda1, sdb1, sdc1 or sda1, sda2, sda3, and so forth)
3) Any hard drive errors should start popping up on your display (things like "Drive Seek" or "Sector Read" errors)

How long each of these tests is going to take depends on the speed of the drives. To get a good idea, do "hdparm -t /dev/sdX#) on a disk, it will tell you how many MB/sec it can read. Then divide the total capacity of the drive by that number, and you'll know how many seconds it's going to take.

Example: A 1TB disk that reads at 35MB/sec means 8 hours for one 1TB drive.
A 1TB disk that reads at 125MB/sec means 2 hours for one 1TB drive.

ProTIP: You can "chain" all of your tests together and review the logs later by doing the following;
time dd if=/dev/sda1 of=/dev/null ; sleep 5 ; \
time dd if=/dev/sdb1 of=/dev/null ; sleep 5 ; \
time dd if=/dev/sdc1 of=/dev/null ; sleep 5 &
 
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Old 01-25-2011, 05:13 PM   #5
thorkelljarl
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As an alternative to KNOPPIX 5.1.1...

You state that Ubuntu almost got you there. If you think that Ubuntu 10.10 would solve your problem but for the lack of a package or facility, you might consider that you can use a USB flash drive to make a persistent installation of Ubuntu and perhaps add whatever is needed to get you there all the way.

If you find that a live RHEL/CentOS is a better starting point, you can likewise make and modify a persistent USB installation of either of them.

Last edited by thorkelljarl; 01-25-2011 at 05:19 PM.
 
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Old 01-26-2011, 08:17 PM   #6
mudgie
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Registered: Dec 2001
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Posts: 14

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Quote:
Originally Posted by xeleema View Post
@mudgie

I think its time for a few questions;
1) Which ioMega NAS device is this?
2) Can you find out the "version" of their software & firmware running on it?
3) Since you can boot Knoppix, what do you see drive-wise?
4) Have you tested the actual hard drives themselves to make sure they're still good?

Boot knoppix, and open a terminal as root. From there review the output from the following commands;
dmesg | grep sd[a-z]
and
dmesg | grep hd[a-z]

Once you know what device names you have, then just do the following on each device;
fdisk -l /dev/sd#
or
fdisk -l /dev/hd#
(We need to know the manufacturer, model, and size of each disk, as well as what partitions & partition-types are on each one)

Once you have that, then we can start doing "Read Tests";

WARNING: Do not get "if=" and "of=" below confused, you can destroy your data if you do!
1) Start tailing your logs;
tail -f /var/log/messages &
2) Perform a read-test on one entire disk.
time dd if=/dev/sdX# of=/dev/null &
Where X is a letter and # is a partition number (Examples: sda1, sdb1, sdc1 or sda1, sda2, sda3, and so forth)
3) Any hard drive errors should start popping up on your display (things like "Drive Seek" or "Sector Read" errors)

How long each of these tests is going to take depends on the speed of the drives. To get a good idea, do "hdparm -t /dev/sdX#) on a disk, it will tell you how many MB/sec it can read. Then divide the total capacity of the drive by that number, and you'll know how many seconds it's going to take.

Example: A 1TB disk that reads at 35MB/sec means 8 hours for one 1TB drive.
A 1TB disk that reads at 125MB/sec means 2 hours for one 1TB drive.

ProTIP: You can "chain" all of your tests together and review the logs later by doing the following;
time dd if=/dev/sda1 of=/dev/null ; sleep 5 ; \
time dd if=/dev/sdb1 of=/dev/null ; sleep 5 ; \
time dd if=/dev/sdc1 of=/dev/null ; sleep 5 &
xeleema,

This is a StorCenter Pro NAS ix4-200r with four 1tb drives. It's their latest software version (I can't get to that while I'm in Knoppix so I'll follow up later on that). I can see all four drives on the Knoppix desktop, each has two partitions (sda1 and 2, sdb1 and 2, etc.). The drives appear to be fine insofar as the BIOS SMART status is concerned. Iomega support believes the array may have gotten corrupted during heavy traffic. The unit is nearly new.

Here are the results of some of the commands above:

root@Knoppix:/ramdisk/home/knoppix# dmesg | grep sd[a-z]
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write through
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write through
sda: sda1 sda2
sd 0:0:0:0: Attached scsi disk sda
SCSI device sdb: 1953525168 512-byte hdwr sectors (1000205 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write through
SCSI device sdb: 1953525168 512-byte hdwr sectors (1000205 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write through
sdb: sdb1 sdb2
sd 1:0:0:0: Attached scsi disk sdb
SCSI device sdc: 1953525168 512-byte hdwr sectors (1000205 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write through
SCSI device sdc: 1953525168 512-byte hdwr sectors (1000205 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write through
sdc: sdc1 sdc2
sd 2:0:0:0: Attached scsi disk sdc
SCSI device sdd: 1953525168 512-byte hdwr sectors (1000205 MB)
sdd: Write Protect is off
sdd: Mode Sense: 00 3a 00 00
SCSI device sdd: drive cache: write through
SCSI device sdd: 1953525168 512-byte hdwr sectors (1000205 MB)
sdd: Write Protect is off
sdd: Mode Sense: 00 3a 00 00
SCSI device sdd: drive cache: write through
sdd: sdd1 sdd2
sd 3:0:0:0: Attached scsi disk sdd

root@Knoppix:/ramdisk/home/knoppix# dmesg | grep hd[a-z]
ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hdaio, hdbio
ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdcio, hddio
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sda: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sdb: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sdb: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sdc: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sdc: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sdd: 1953525168 512-byte hdwr sectors (1000205 MB)
SCSI device sdd: 1953525168 512-byte hdwr sectors (1000205 MB)


Device Boot Start End Blocks Id System
/dev/sda1 1 127 1020096 83 Linux
/dev/sda2 128 121602 975742455+ 83 Linux

cks Id System
/dev/sda1 1 127 1020096 83 Linux
/dev/sda2 128 121602 975742455+ 83 Linux

root@Knoppix:/ramdisk/home/knoppix# fdisk -l /dev/sda

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 1 127 1020096 83 Linux
/dev/sda2 128 121602 975742455+ 83 Linux

root@Knoppix:/ramdisk/home/knoppix# time dd if=/dev/sda1 of=/dev/null &
[2] 3944

22040192+0 records in
2040192+0 records out
1044578304 bytes (1.0 GB) copied, 13.677 seconds, 76.4 MB/s

real 0m13.729s
user 0m2.096s
sys 0m6.144s

root@Knoppix:/ramdisk/home/knoppix# 1951484911+0 records in
1951484911+0 records out
999160274432 bytes (999 GB) copied, 11108.3 seconds, 89.9 MB/s

real 185m8.346s
user 20m3.627s
sys 89m48.473s

I hope this helps... that's just the first drive - it took quite a while for the last command to yield results. I'm a noob so it's not making a lot of sense to me. Iomega support told me it was DMRAID and recommended this forum. I appreciate all of the help.
 
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Old 01-26-2011, 08:20 PM   #7
mudgie
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Registered: Dec 2001
Distribution: RH 7.X
Posts: 14

Original Poster
Rep: Reputation: 5
Quote:
Originally Posted by thorkelljarl View Post
As an alternative to KNOPPIX 5.1.1...

You state that Ubuntu almost got you there. If you think that Ubuntu 10.10 would solve your problem but for the lack of a package or facility, you might consider that you can use a USB flash drive to make a persistent installation of Ubuntu and perhaps add whatever is needed to get you there all the way.

If you find that a live RHEL/CentOS is a better starting point, you can likewise make and modify a persistent USB installation of either of them.
thorkelljarl,

Thanks for helping. Ubuntu actually recognized that it was a RAID volume but gave me the message "Not enough components available to start the RAID array". I'll boot from a few others - LiLi is awesome for that - the USB DVD drive method seems to be very flaky.

If I knew how to add the necessary components to the USB key that might be the solution. Otherwise if you know of a rescue build that has DMRAID that would a possible solution.

Last edited by mudgie; 01-26-2011 at 08:27 PM.
 
Old 01-26-2011, 10:15 PM   #8
mudgie
LQ Newbie
 
Registered: Dec 2001
Distribution: RH 7.X
Posts: 14

Original Poster
Rep: Reputation: 5
Quote:
Originally Posted by xeleema View Post
Greetingz!

There's a few LiveCD's that have saved the proverbial bacon a few times for me;
Knoppix (grab the torrent)
SystemRescueCD (download page)
Hiren's Boot CD (you're going to have to google that one)
Gentoo Live CD (download link) DMraid+nVidiaRAID Howto

Hope some of this helps!
This does help (I think...) as I finally managed to get the systemrestorecd to boot from USB. It worked as 64-bit. Here's the result of the "show filesystems" app:

=====================>>> fsarchiver probe simple <<<=====================
[======DISK======] [=============NAME==============] [====SIZE====] [MAJ] [MIN]
[sda ] [ST31000520AS ] [ 931.51 GB] [ 8] [ 0]
[sdb ] [ST31000520AS ] [ 931.51 GB] [ 8] [ 16]
[sdc ] [ST31000520AS ] [ 931.51 GB] [ 8] [ 32]
[sdd ] [ST31000520AS ] [ 931.51 GB] [ 8] [ 48]
[sde ] [DataTraveler G3 ] [ 1.87 GB] [ 8] [ 64]

[=====DEVICE=====] [==FILESYS==] [======LABEL======] [====SIZE====] [MAJ] [MIN]
[loop0 ] [squashfs ] [<unknown> ] [ 225.20 MB] [ 7] [ 0]
[sda1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 1]
[sda2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 2]
[sdb1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 17]
[sdb2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 18]
[sdc1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 33]
[sdc2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 34]
[sdd1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 49]
[sdd2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 50]
[sde1 ] [vfat ] [MYLINUXLIVE ] [ 1.87 GB] [ 8] [ 65]
[md126 ] [ext2 ] [<unknown> ] [ 996.12 MB] [ 9] [126]
[md127 ] [LVM2_member] [<unknown> ] [ 2.73 TB] [ 9] [127]
[dm-0 ] [xfs ] [<unknown> ] [ 2.73 TB] [253] [ 0]

Press a key to continue

Storage1 is the netbios name of the NAS drive so this is encouraging. md127 or dm-0 appear to represent the array. How do I mount it? (i wish i wasn't such a noob!)

Thanks!
 
Old 01-26-2011, 11:53 PM   #9
xeleema
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Good progress!

Okay, so you can almost see the array with the SystemRestoreCD. Try mounting one of these (the green one's below);

Code:
[=====DEVICE=====] [==FILESYS==] [======LABEL======] [====SIZE====] [MAJ] [MIN]
[loop0 ] [squashfs ] [<unknown> ] [ 225.20 MB] [ 7] [ 0]
[sda1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 1]
[sda2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 2]
[sdb1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 17]
[sdb2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 18]
[sdc1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 33]
[sdc2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 34]
[sdd1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 49]
[sdd2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 50]
[sde1 ] [vfat ] [MYLINUXLIVE ] [ 1.87 GB] [ 8] [ 65]
[md126 ] [ext2 ] [<unknown> ] [ 996.12 MB] [ 9] [126]
[md127 ] [LVM2_member] [<unknown> ] [ 2.73 TB] [ 9] [127]
[dm-0 ] [xfs ] [<unknown> ] [ 2.73 TB] [253] [ 0] 
This is what you should do;
1) Open a terminal session
(Should be a shortcut somewhere)
2) create a few mount points
"mkdir /test1 /test2"
3) Attempt to mount them read-only.
"mount -t auto -o ro /dev/md126 /mnt/test1"
"mount -t auto -o ro /dev/md127 /mnt/test2"

If that doesn't work post the error you get (along with what you typed).

P.S: For large chunks of output, wrap your post in [code] & [/code] tags (makes it easier to read).
 
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Old 01-27-2011, 12:19 AM   #10
mudgie
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Registered: Dec 2001
Distribution: RH 7.X
Posts: 14

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Quote:
Originally Posted by xeleema View Post
Good progress!

Okay, so you can almost see the array with the SystemRestoreCD. Try mounting one of these (the green one's below);

Code:
[=====DEVICE=====] [==FILESYS==] [======LABEL======] [====SIZE====] [MAJ] [MIN]
[loop0 ] [squashfs ] [<unknown> ] [ 225.20 MB] [ 7] [ 0]
[sda1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 1]
[sda2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 2]
[sdb1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 17]
[sdb2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 18]
[sdc1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 33]
[sdc2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 34]
[sdd1 ] [linux_raid_] [<unknown> ] [ 996.19 MB] [ 8] [ 49]
[sdd2 ] [linux_raid_] [storage:1 ] [ 930.54 GB] [ 8] [ 50]
[sde1 ] [vfat ] [MYLINUXLIVE ] [ 1.87 GB] [ 8] [ 65]
[md126 ] [ext2 ] [<unknown> ] [ 996.12 MB] [ 9] [126]
[md127 ] [LVM2_member] [<unknown> ] [ 2.73 TB] [ 9] [127]
[dm-0 ] [xfs ] [<unknown> ] [ 2.73 TB] [253] [ 0] 
This is what you should do;
1) Open a terminal session
(Should be a shortcut somewhere)
2) create a few mount points
"mkdir /test1 /test2"
3) Attempt to mount them read-only.
"mount -t auto -o ro /dev/md126 /mnt/test1"
"mount -t auto -o ro /dev/md127 /mnt/test2"

If that doesn't work post the error you get (along with what you typed).

P.S: For large chunks of output, wrap your post in [code] & [/code] tags (makes it easier to read).
Thanks for the advice on the posts, I'll follow on any future posts. Here's the commands and the response:

% mkdir /mnt/test2
% mkdir /mnt/test1
% mount -t auto -o ro /dev/md126 /mnt/test1
% mount -t auto -o ro /dev/md127 /mnt/test2
mount: unknown filesystem type 'LVM2_member'

I can see Grub, etc. in mnt/test1

Last edited by mudgie; 01-27-2011 at 01:52 AM.
 
Old 01-27-2011, 12:29 AM   #11
mudgie
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Distribution: RH 7.X
Posts: 14

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Quote:
Originally Posted by mudgie View Post
Thanks for the advice on the posts, I'll follow on any future posts. Here's the commands and the response:

% mkdir /mnt/test2
% mkdir /mnt/test1
% mount -t auto -o ro /dev/md126 /mnt/test1
% mount -t auto -o ro /dev/md127 /mnt/test2
mount: unknown filesystem type 'LVM2_member'

I can see Grub, etc. in mnt/test1
*UPDATE*
Hokey smokes... I figured it out! I typed the following:
% lvscan
ACTIVE '/dev/md1_vg/md1vol1' [2.73 TiB] inherit

So I tried this:
% mount -o ro /dev/md1_vg/md1vol1 /mnt/test2

I now see my data under /mnt/test2/samba/shares

Copy job is underway thanks to you...bravo!

Last edited by mudgie; 01-27-2011 at 01:51 AM. Reason: cleanup
 
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Old 01-27-2011, 02:05 AM   #12
xeleema
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That's GREAT news!
Can you do us a lil favor? Up at the top you should see "Thread Tools", can you mark this as [SOLVED] for anyone else that might have stumbled across this?
Good Luck on the copy!
 
Old 03-12-2011, 09:27 AM   #13
mudgie
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Darn, it broke again. It appears to be related to corrupt files that were brought over to the NAS shares. I can't access anything from the Iomega interface but I can still mount the array using the instructions above. Iomega support suggested that I delete the corrupt files from the volume. I've been mounting it with the "-o ro" option up until now. I'd like to mount it read-write but it hangs when I try "-o w". Any suggestions?
 
Old 04-23-2011, 12:52 AM   #14
xeleema
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Quote:
Originally Posted by mudgie View Post
Darn, it broke again.
Dang it! Do you guys at least have a backup this time? :P

Quote:
Originally Posted by mudgie View Post
It appears to be related to corrupt files that were brought over to the NAS shares.
How "corrupt"? Just the contents of the files, or are the filenames jacked-up, too?

Quote:
Originally Posted by mudgie View Post
I can't access anything from the Iomega interface but I can still mount the array using the instructions above.
Okay, that's a bit weird. Does the interface fail to see the "corrupt" files at all?
Or does it "see" the files, and it hangs when you try to access the contents of the file(s)?

Quote:
Originally Posted by mudgie View Post
Iomega support suggested that I delete the corrupt files from the volume.
Sounds like something they would say. Hopefully there's a way to determine which files are "corrupt" and which files are not....

Quote:
Originally Posted by mudgie View Post
I've been mounting it with the "-o ro" option up until now. I'd like to mount it read-write but it hangs when I try "-o w". Any suggestions?
Sounds like you need to "fsck" the filesystem (in read-only mode, first).
 
  


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