I'm at my wits' end on this one, folks, and I could do with some help please. This is all for a customer who is desperate to get this data back...

I have an LSI RAID card (Broadcom MegaRAID SAS 9341-4) which has suddenly stopped working. I've been to hell and back trying to get a couple of newer machines to recognise the card and let me near the BIOS.

In fact, this card has been working as a 4-disc RAID10 array for more than a year in a 'Doze 11 machine but just stopped a couple of weeks ago. I bought a new card, a different mobo, new cables, the lot. Nothing. The customer shipped me the original machine so I have access to all that was there before.

I eventually found an older (Ubuntu) machine in my junk pile in which the PCIe slot let me into the BIOS so I recovered the RAID array, but the megaraid_sas driver in Ubuntu refused to work, so I couldn't access the data.

I won't go into the pain involved in getting to this point, but it was extreme and lengthy! I have finally given up on the card, and dropped the 4 drives straight into an Ubuntu box, where I'm trying to get to the data.

What I have now is the four disks all seen by the system, and a /dev/mapper device which is the RAID array.

---- cut here ---- # blkid /dev/sda: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sdb: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sdc: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sdd: UUID="LSI ^P" TYPE="ddf_raid_member" /dev/sde1: LABEL_FATBOOT="Windows USB" LABEL="Windows USB" UUID="8B53-C0AB" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="a85d43c9-01" /dev/loop0: TYPE="squashfs" /dev/mapper/ddf1_RAID10: PTTYPE="PMBR" ---- cut here ----

/sde1 is the USB stick I booted from.

fdisk -l gives me 2 mapper devices:

---- cut here ---- Disk /dev/mapper/ddf1_RAID10: 931 GiB, 999653638144 bytes, 1952448512 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 Disklabel type: dos Disk identifier: 0x00000000

Device Boot Start End Sectors Size Id Type /dev/mapper/ddf1_RAID10-part1 1 4294967295 4294967295 2T ee GPT ---- cut here ----

fdisk on the mapper devices says this:

---- cut here ---- Disk /dev/mapper/ddf1_RAID10: 931 GiB, 999653638144 bytes, 1952448512 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 Disklabel type: dos Disk identifier: 0x00000000

Device Boot Start End Sectors Size Id Type /dev/mapper/ddf1_RAID10-part1 1 4294967295 4294967295 2T ee GPT ---- cut here ----

So it has a partition - but I can't find a way to mount it.

mount /dev/mapper/ddf1_RAID10-part1 /mnt/test mount: /mnt/test: special device /dev/mapper/ddf1_RAID10-part1 does not exist. ---- cut here ----

---- cut here ---- mdadm --examine /dev/mapper/ddf1_RAID10 /dev/mapper/ddf1_RAID10: MBR Magic : aa55 Partition[0] : 4294967295 sectors at 1 (type ee) ---- cut here ----

Any help appreciated!

Cheers, Laurie.