Hi Everyone-
This one has me stumped. I had a client with an old ReadyNAS device which was 10+ years old and SPARC based. It uses software RAID and then mounts it via LVM so it can expand if needed. Since it's an older architecture, you can't simply move the drives to a new device as they are all x86 based using a different filesystem. I posted on the Netgear forums and they re-directed me to
https://web.archive.org/web/20161212...bserver/?p=306 and
https://web.archive.org/web/20160817...th-ubuntu.html which walks you through how to mount the old device as read-only so you can copy the files off. I am doing this with the CentOS 7.4.1708 live CD. I got the fuseext2 rpm from this link:
https://centos.pkgs.org/7/forensics-...86_64.rpm.html. Today there are 4x2TB drives:
Code:
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x9b3e07e2
Device Boot Start End Blocks Id System
/dev/sda1 32 4096031 2048000 fd Linux raid autodetect
/dev/sda2 4096032 5144607 524288 fd Linux raid autodetect
/dev/sda3 5144608 3907010591 1950932992 fd Linux raid autodetect
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x9b3e07ec
Device Boot Start End Blocks Id System
/dev/sdb1 32 4096031 2048000 fd Linux raid autodetect
/dev/sdb2 4096032 5144607 524288 fd Linux raid autodetect
/dev/sdb3 5144608 3907010591 1950932992 fd Linux raid autodetect
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x7f30f898
Device Boot Start End Blocks Id System
/dev/sdc1 32 4096031 2048000 fd Linux raid autodetect
/dev/sdc2 4096032 5144607 524288 fd Linux raid autodetect
/dev/sdc3 5144608 3907010591 1950932992 fd Linux raid autodetect
Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x7f30f891
Device Boot Start End Blocks Id System
/dev/sdd1 32 4096031 2048000 fd Linux raid autodetect
/dev/sdd2 4096032 5144607 524288 fd Linux raid autodetect
/dev/sdd3 5144608 3907010591 1950932992 fd Linux raid autodetect
Each drive has three partitions. /dev/sd*1 belong to the OS that runs the NAS and is setup as /dev/md126 as RAID1. /dev/sd*3 is the data and is setup as RAID5. Both software RAIDS are intact:
Code:
cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md126 : active (auto-read-only) raid1 sdd1[2] sda1[3] sdc1[1] sdb1[0]
2047936 blocks [4/4] [UUUU]
md127 : active (auto-read-only) raid5 sdd3[2] sdc3[1] sda3[3] sdb3[0]
5852786688 blocks level 5, 4096k chunk, algorithm 0 [4/4] [UUUU]
unused devices: <none>
A vgscan shows the group:
Code:
vgscan
Reading volume groups from cache.
Found volume group "c" using metadata type lvm2
PVS also shows it as intact:
Code:
pvs
PV VG Fmt Attr PSize PFree
/dev/md127 c lvm2 a-- 5.45t 0
and lvdisplay:
Code:
lvdisplay c
--- Logical volume ---
LV Path /dev/c/c
LV Name c
VG Name c
LV UUID NlKR34-7CHi-mTLU-McCD-bvOF-3M9m-gqC0TP
LV Write Access read/write
LV Creation host, time ,
LV Status suspended
# open 0
LV Size 5.45 TiB
Current LE 178613
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
and vgdisplay:
Code:
vgdisplay
--- Volume group ---
VG Name c
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 5.45 TiB
PE Size 32.00 MiB
Total PE 178613
Alloc PE / Size 178613 / 5.45 TiB
Free PE / Size 0 / 0
VG UUID 0Nidfo-3d2b-ayh1-yl48-R0HE-8G11-5jEEby
and pvdisplay:
Code:
pvdisplay
--- Physical volume ---
PV Name /dev/md127
VG Name c
PV Size 5.45 TiB / not usable <4.19 MiB
Allocatable yes (but full)
PE Size 32.00 MiB
Total PE 178613
Free PE 0
Allocated PE 178613
PV UUID izLiST-kTJw-E77o-8UIf-d6J7-tDt2-ZjKGQ4
When I run vgchange -ay c I get this output:
Code:
vgchange -ay c
device-mapper: resume ioctl on (253:3) failed: Invalid argument
Unable to resume c-c (253:3)
1 logical volume(s) in volume group "c" now active
I also have this in /var/log/messages:
Code:
Dec 14 18:14:48 localhost kernel: device-mapper: table: 253:3: md127 too small for target: start=384, len=11705581568, dev_size=11705573376
This seems to indicate that the LVM is too large for the physical drive itself. I checked this out and got this:
Code:
[root@localhost ~]# lvs --partial --segments -o+devices /dev/c/c
PARTIAL MODE. Incomplete logical volumes will be processed.
WARNING: Cannot find matching striped segment for c/c.
LV VG Attr #Str Type SSize Devices
c c -wi-XX--X- 1 linear 5.45t /dev/md127(0)
[root@localhost ~]# blockdev --getsize64 /dev/md127
5993253568512
[root@localhost ~]# pvdisplay --units=b /dev/md127
--- Physical volume ---
PV Name /dev/md127
VG Name c
PV Size 5993257959424 B / not usable 4390912 B
Allocatable yes (but full)
PE Size 33554432 B
Total PE 178613
Free PE 0
Allocated PE 178613
PV UUID izLiST-kTJw-E77o-8UIf-d6J7-tDt2-ZjKGQ4
[root@localhost ~]#
It looks like the PV is about 4MB too large compared with the underlying device which is what is generating the error. Trying to mount it with fuseext2 gives me this:
Code:
[root@localhost ~]# fuseext2 -o ro -o sync_read /dev/c/c /root/mnt
Open_ext2 Error:2
[root@localhost ~]#
Does anyone have any suggestions?
Thanks.
