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Error: mount: unknown filesystem type 'ext4'


wwwcom
2016-05-24, 04:50 PM
It's 2016 and OVH rescue system doesn't support EXT4? OVH makes the volume default EXT3 ?

What is this amateur hour?

How come the dedicated rescue system does EXT4?

24x7servermanagement
2016-05-04, 03:53 AM
Maybe we would like to give a try to mount the drives for you.

shobu
2016-05-03, 02:17 PM
Pl give a solution for mount ext4 in rescue mode. OVH vps specialist are telling there is no chance to get data. Pl help
Me reported the issue on 30 APril 16 but now they are saying its not possible to recover data.
-----------
From: OVH Support
Hello,
Thank you for your patience.
After verification with our specialists, it appears that vdb1 is currently
empty. We also do not have a backup of that disk so we cannot restore any
data.

If there was any data before, it has unfortunately been erased. Did you do any
action before losing access to your VPS? Your disk being in ext4 tells us that
you may have mistakenly deleted your data as it is not in the format we
provided you with (ext3).

OVH support discussion below
----------------------
From: You
Hi,
When we mount we are getting
Error: mount: unknown filesystem type 'ext4'
4/30/16 8:36 PM
-----------------------------
From: OVH Support
Hello,

Since it's a Virtual server, there's no need to mount your drives. You should
be able to access your data as soon as the server is done rebooting in rescue
mode.

Customer Advocate
5/1/16 10:20 AM
------------------------------------
From: You
when we type df -h its not showing the mounted data
5/1/16 10:43 AM
From: You
Hello,

My VPS is down since last day. All my business done. Pl help its urgent
We cant find the path to our data. Please explain the path to our data.
if any paid service for recovery our data please let me know its URGENT

Thanks
5/1/16 10:25 AM
------------

From: OVH Support
Hello,

Could you please send us the result of the df -h command, so we can
investigate the issue further?

For any other questions or concerns, please feel free to contact us through a
support ticket or through our toll-free line at 1-855-684-5463. We’re here
24/7 to help you!
5/1/16 11:15 AM
-----------------------------------------------

From: You
root@rescue-pro:/# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 9.9G 2.3G 7.2G 24% /
udev 10M 0 10M 0% /dev
tmpfs 197M 144K 197M 1% /run
/dev/vda1 9.9G 2.3G 7.2G 24% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 393M 0 393M 0% /run/shm
root@rescue-pro:/#
-------------------------------

From: You
root@rescue-pro:~# fdisk -l

Disk /dev/vda: 10.7 GB, 10737418240 bytes
4 heads, 32 sectors/track, 163840 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/vda1 * 2048 20971519 10484736 83 Linux

Disk /dev/vdb: 26.8 GB, 26843545600 bytes
16 heads, 63 sectors/track, 52012 cylinders, total 52428800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000574cf

Device Boot Start End Blocks Id System
/dev/vdb1 * 2048 52428799 26213376 83 Linux
root@rescue-pro:~# mount /dev/vdb1 /mnt
mount: unknown filesystem type 'ext4'
root@rescue-pro:~# fdisk -l

Disk /dev/vda: 10.7 GB, 10737418240 bytes
4 heads, 32 sectors/track, 163840 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/vda1 * 2048 20971519 10484736 83 Linux

Disk /dev/vdb: 26.8 GB, 26843545600 bytes
16 heads, 63 sectors/track, 52012 cylinders, total 52428800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000574cf

Device Boot Start End Blocks Id System
/dev/vdb1 * 2048 52428799 26213376 83 Linux
root@rescue-pro:~#

--------------------------------------------
From: OVH Support
Hello,

Thank you for your patience.

It appears that the drive that you are trying to mount is in a format (ext4)
that is not supported by default by the kernel in rescue. The process of
mounting drive in itself is not supported, but you should be able to mount it
using some alternative means. Here is an article for a similar problem that
has been fixed by altering the mount command :

5/1/16 6:20 PM
----------------------------------------------------------

From: YouSee the raw version of the message
root@rescue-pro:~# tune2fs -E test_fs /dev/vdb1
tune2fs 1.42.5 (29-Jul-2012)
Setting test filesystem flag
root@rescue-pro:~# mount -t ext4dev /dev/vdb1 /mnt
mount: unknown filesystem type 'ext4dev'
root@rescue-pro:~#
5/1/16 8:12 PM
From: YouSee the raw version of the message
root@rescue-pro:~# fsck /dev/vdb1
fsck from util-linux 2.20.1
e2fsck 1.42.5 (29-Jul-2012)
/dev/vdb1: clean, 11/1638400 files, 146849/6553344 blocks
root@rescue-pro:~#
5/1/16 8:09 PM
From: You
based on the link me getting same issue
5/1/16 7:44 PM

------------------------

From: OVH Support
Hello,

Here is the command line to mount your device:

tune2fs -E test_fs /dev/vdb1
mount -t ext4dev /dev/vdb1 /mnt

For any other questions or concerns, please feel free to contact us through a
support ticket or through our toll-free line at 1-855-684-5463. We’re here
24/7 to help you!

We thank you again for choosing OVH,

Colin
Customer Advocate
Make sure to visit our FAQ: [1]http://docs.ovh.ca/en/faqs.html


[1] http://docs.ovh.ca/en/faqs.html
5/1/16 8:15 PM
-------------------------

From: You
Hi,
As a system admin, me did all the steps from rescue guide provided by OVH. But till now i didnt recovered my data. Almost 2 days over. Please escalate my issue to VPS specialist asap.
Looking forward to a positive reply. Please guide to retry the data from my VPS.
I dont have anyother data backup
5/1/16 10:37 PM

-----------------------------------------

From: OVH Support
Hello,

I have escalated your case to our VPS specialists in order to see what we can
do to help you get a backup of your data.

We will get back to you once we get an update on the case.

Meanwhile, you can try rebooting the server in the rescue mode one more time
and see if your disk is not already mounted on your filesystem. Usually, once
in the rescue mode, you should have your disk mounted on the folder /mnt/vdb1
. If you are able to see your server's filesystem in that folder, you can make
a full backup of your data.

For any other questions or concerns, please feel free to contact us through a
support ticket or through our toll-free line at 1-855-684-5463. We’re here
24/7 to help you!

Customer Advocate
5/1/16 10:38 PM
----------------------------------

From: You
Hello,
Till now no response from your end. From the last 3 days , my VPS down. Pl help to take my data in rescue mode.
After that i will reinstall my VPS. /dev/vdb1 is not mounting in rescue mode.
pl solve the issue asap
5/3/16 7:55 AM
-------------------------------------

From: OVH Support
Hello,

Thank you for your patience.

After verification with our specialists, it appears that vdb1 is currently
empty. We also do not have a backup of that disk so we cannot restore any
data.

If there was any data before, it has unfortunately been erased. Did you do any
action before losing access to your VPS? Your disk being in ext4 tells us that
you may have mistakenly deleted your data as it is not in the format we
provided you with (ext3).

For any other questions or concerns, please feel free to contact us through a
support ticket or through our toll-free line at 1-855-684-5463. We’re here
24/7 to help you!
Customer Advocate
5/3/16 7:42 PM
-------------------------------------

From: You
Hello,

Before entering in rescue mode me just restartebd my vps via Plesk Panel. After some time VPS not booting.
This is the process me did 2 days before. ut now you people saying no data.
How it is possible then what is the use of rescue mode in OVH manager.
In my vps me installed Plesk panel in centos 6 OS. its file system is by default EXT4.
In rescue mode you people are giving debian OS, it is not supporting to mount ext4. Giveme for that issue solution.
What i do pl give proper answer.
Due to this My business is done for the last 3 days. How i can belive your service . we are doing reseller business by using your service
5/3/16 9:59 PM
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