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Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
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RAID LINUX LVM

August 18th, 2011, 8:48

Hi to all! :mrgreen:

4hdds 274.8gb => 1 Partition 836.68GB LVM PHYSICAL VOLUME PARTITION

Which tool to use in this case? :shock:

Re: RAID LINUX LVM

August 18th, 2011, 9:07

linux of course. ;)

Re: RAID LINUX LVM

August 18th, 2011, 9:09

btw LVM is a device mapper layer, so if the LV is untouched, you can find the FS inside 1:1

Re: RAID LINUX LVM

August 18th, 2011, 9:11

Also, if you can access to an EnCase... There is a fonctionnality that scan for LVM...

Re: RAID LINUX LVM

August 18th, 2011, 16:26

SystemRescueCd

Re: RAID LINUX LVM

August 18th, 2011, 17:36

N.C. wrote:btw LVM is a device mapper layer, so if the LV is untouched, you can find the FS inside 1:1


Agree with you on this

i have a ready Linux machine for this purpose fully loaded with all of the RAID tools
and use it most in those NAS (RAID) fixing and repairing

MUST to have one in ur LAB

Re: RAID LINUX LVM

August 18th, 2011, 19:00

sudo pvscan
sudo vgchange -a -y

Should assemble and attach your Volume Groups, there can be multiple LVMs in a Volume group,

If it does not, please post the output of

sudo pvscan -vvvvvv

Re: RAID LINUX LVM

August 19th, 2011, 10:46

For this case you need 3 things:

Winhex
UFS Explorer
A Brain

:wink:

Re: RAID LINUX LVM

August 19th, 2011, 19:50

hddguy wrote:For this case you need 3 things:

Winhex
UFS Explorer
A Brain

:wink:


Eh, worst comes to worst you just need two linux built-ins, hexdump to find the beginning of the partition and mount -o offset=<the offset in bytes to the partition>

You don't need Winhex or UFS Explorer.

Brain is not optional
Brain is never optional

Re: RAID LINUX LVM

August 20th, 2011, 14:00

Michael.Reilly wrote:
hddguy wrote:For this case you need 3 things:

Winhex
UFS Explorer
A Brain

:wink:


Eh, worst comes to worst you just need two linux built-ins, hexdump to find the beginning of the partition and mount -o offset=<the offset in bytes to the partition>

You don't need Winhex or UFS Explorer.

Brain is not optional
Brain is never optional


Disagree with you here

Winhex is a MUST have tool for RAID
you may ask the Experts in RAID to confirm this info.

Re: RAID LINUX LVM

August 23rd, 2011, 20:26

For Linux LVM you don't need Winhex. (Are LVMs even stripped? Can Winhex even read LVMs?) As far as RAIDs go, I either use a custom written python script to assemble them (for RAID5 and RAID0 with stripe size < 4KiB) or use mdadm --build to assemble the RAID without a RAID superblock.

I haven't needed to assemble a RAID6 yet, but I already know the process if that becomes needed. Hard part would be finding the correct LFSR.

I'm sure Winhex makes it easier, but I don't need easier. ;)
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