* Re: Recover filenames from failed RAID0
2016-07-17 19:10 ` Recover filenames from failed RAID0 Michel Dubois
@ 2016-07-18 9:37 ` keld
0 siblings, 0 replies; 2+ messages in thread
From: keld @ 2016-07-18 9:37 UTC (permalink / raw)
To: Michel Dubois
Cc: linux-raid, Lars Ellenberg, Jens Axboe, linux-block, Keith Busch,
Martin K. Petersen, Peter Zijlstra, Jiri Kosina, Ming Lei,
Kirill A. Shutemov, NeilBrown, linux-kernel, Takashi Iwai,
linux-bcache, Zheng Liu, Kent Overstreet, dm-devel, Shaohua Li,
Ingo Molnar, Alasdair Kergon, Roland Kammerer, Mike Snitzer
Hi
Which file system did you use?
I once wrote some code to get files out of an ext3 filesystem,
http://www.open-std.org/keld/readme-salvage.html
Maybe you can make some corrections for it to work
as I remember the code, then if you hit a directory, it will salvage the file names and the files
of that directory.
Best regards
keld
On Sun, Jul 17, 2016 at 03:10:03PM -0400, Michel Dubois wrote:
> Dear linux-raid mailing list,
>
> I have a RAID0 array of four 3TB disks that failed on the "third" disk.
>
> I am aware of the non-redundancy of RAID0 but I would like to recover
> the filenames from that RAID0. If I could recover some data it would
> be a bonus.
>
> Below you'll find the outputs of the following commands
> mdadm --examine /dev/sd[abcd]1
> fdisk -l
>
> where sda1, sdb1, sdc1 and sdd1 should be the 4 RAID devices.
>
> What could be my next step?
>
> I thank you for your time
>
> Michel Dubois
>
> ======================
> mdadm --examine /dev/sd[abcd]1
> /dev/sda1:
> Magic : a92b4efc
> Version : 00.90.00
> UUID : 7d247a6e:7b5d46c8:f52d9c89:db304b21
> Creation Time : Mon Apr 23 19:55:36 2012
> Raid Level : raid1
> Used Dev Size : 20980800 (20.01 GiB 21.48 GB)
> Array Size : 20980800 (20.01 GiB 21.48 GB)
> Raid Devices : 4
> Total Devices : 3
> Preferred Minor : 0
>
> Update Time : Mon Jun 27 21:12:23 2016
> State : clean
> Active Devices : 3
> Working Devices : 3
> Failed Devices : 1
> Spare Devices : 0
> Checksum : 1a57db60 - correct
> Events : 164275
>
>
> Number Major Minor RaidDevice State
> this 0 8 1 0 active sync /dev/sda1
>
> 0 0 8 1 0 active sync /dev/sda1
> 1 1 8 17 1 active sync /dev/sdb1
> 2 2 0 0 2 faulty removed
> 3 3 8 33 3 active sync /dev/sdc1
> /dev/sdb1:
> Magic : a92b4efc
> Version : 00.90.00
> UUID : 7d247a6e:7b5d46c8:f52d9c89:db304b21
> Creation Time : Mon Apr 23 19:55:36 2012
> Raid Level : raid1
> Used Dev Size : 20980800 (20.01 GiB 21.48 GB)
> Array Size : 20980800 (20.01 GiB 21.48 GB)
> Raid Devices : 4
> Total Devices : 3
> Preferred Minor : 0
>
> Update Time : Mon Jun 27 21:12:23 2016
> State : clean
> Active Devices : 3
> Working Devices : 3
> Failed Devices : 1
> Spare Devices : 0
> Checksum : 1a57db72 - correct
> Events : 164275
>
>
> Number Major Minor RaidDevice State
> this 1 8 17 1 active sync /dev/sdb1
>
> 0 0 8 1 0 active sync /dev/sda1
> 1 1 8 17 1 active sync /dev/sdb1
> 2 2 0 0 2 faulty removed
> 3 3 8 33 3 active sync /dev/sdc1
> /dev/sdc1:
> Magic : a92b4efc
> Version : 00.90.00
> UUID : 7d247a6e:7b5d46c8:f52d9c89:db304b21
> Creation Time : Mon Apr 23 19:55:36 2012
> Raid Level : raid1
> Used Dev Size : 20980800 (20.01 GiB 21.48 GB)
> Array Size : 20980800 (20.01 GiB 21.48 GB)
> Raid Devices : 4
> Total Devices : 3
> Preferred Minor : 0
>
> Update Time : Mon Jun 27 21:12:23 2016
> State : clean
> Active Devices : 3
> Working Devices : 3
> Failed Devices : 1
> Spare Devices : 0
> Checksum : 1a57db86 - correct
> Events : 164275
>
>
> Number Major Minor RaidDevice State
> this 3 8 33 3 active sync /dev/sdc1
>
> 0 0 8 1 0 active sync /dev/sda1
> 1 1 8 17 1 active sync /dev/sdb1
> 2 2 0 0 2 faulty removed
> 3 3 8 33 3 active sync /dev/sdc1
>
> ======================
> fdisk -l
>
> WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util
> fdisk doesn't support GPT. Use GNU Parted.
>
>
> Disk /dev/sda: 3000.5 GB, 3000592982016 bytes
> 255 heads, 63 sectors/track, 364801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x03afffbe
>
> Device Boot Start End Blocks Id System
> /dev/sda1 1 267350 2147483647+ ee EFI GPT
>
> WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util
> fdisk doesn't support GPT. Use GNU Parted.
>
>
> Disk /dev/sdb: 3000.5 GB, 3000592982016 bytes
> 255 heads, 63 sectors/track, 364801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x142a889c
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 1 267350 2147483647+ ee EFI GPT
>
> WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util
> fdisk doesn't support GPT. Use GNU Parted.
>
>
> Disk /dev/sdc: 3000.5 GB, 3000592982016 bytes
> 255 heads, 63 sectors/track, 364801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x3daebd50
>
> Device Boot Start End Blocks Id System
> /dev/sdc1 1 267350 2147483647+ ee EFI GPT
>
> Disk /dev/md0: 21.4 GB, 21484339200 bytes
> 2 heads, 4 sectors/track, 5245200 cylinders
> Units = cylinders of 8 * 512 = 4096 bytes
> Disk identifier: 0x00000000
>
> Disk /dev/md0 doesn't contain a valid partition table
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