Hi,
sorry for the vague subject line. I experience a very weird behavior
here and I am not even sure this is a parted problem or a Linux problem.
Please help me to understand this problem (sorry for the length):
I have a box running kernel 2.6.23 (self compiled, config available upon
request). The box has 16 Hitachi 750 GB drives connected to an Areca
1261ML controller. Right now I have created a system disk (stand-alone)
and a RAID6 raid set with two volumes on it: 1 TB and around 4 TB
(/dev/sdc).
Since this exceeds 2 TB, I prepare this device as follows (tested with
parted 1.7.1 and 1.8.8)
# parted /dev/sdc
(parted) mklabel gpt
(parted) mkpart Data xfs 0 -1
(parted) print
Disk /dev/sdc: 4251GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 17,4kB 4251GB 4251GB xfs Data
(parted) quit
Then I create a xfs file system:
# mkfs.xfs -f /dev/sdc1
meta-data=/dev/sdc1 isize=256 agcount=32,
agsize=32433253 blks
= sectsz=512 attr=0
data = bsize=4096 blocks=1037864096, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=1
naming =version 2 bsize=4096
log =internal log bsize=4096 blocks=32768, version=1
= sectsz=512 sunit=0 blks
realtime =none extsz=65536 blocks=0, rtextents=0
For checks I prepare two hexdumps:
# hexdump -C -n 131072 -v /dev/sdc > hexdump.gen.sdc
# hexdump -C -n 131072 -v /dev/sdc1 > hexdump.gen.sdc1
Checking if this looks alright:
# grep EFI hexdump.gen.sdc*
hexdump.gen.sdc:00000200 45 46 49 20 50 41 52 54 00 00 01 00 5c 00 00
00 |EFI PART....\...|
# grep XFSB hexdump.gen.sdc*
hexdump.gen.sdc:00004400 58 46 53 42 00 00 10 00 00 00 00 00 3d dc 8c
a0 |XFSB........=...|
hexdump.gen.sdc1:00000000 58 46 53 42 00 00 10 00 00 00 00 00 3d dc 8c
a0 |XFSB........=...|
Looks fine by me, mounting also works nicely:
# mount /dev/sdc1 /data
# df -m /data
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/sdc1 4054029 6 4054024 1% /data
Now I reboot the box.
*WAIT*
starting parted again to check if everything is still there:
# parted /dev/sdc print
Disk /dev/sdc: 4251GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 17,4kB 4251GB 4251GB xfs Data
Looks fine. But now I want to mount the partition again:
# mount /dev/sdc1 /data
mount: you must specify the filesystem type
Opps. OK, I know it's xfs:
# mount -t xfs /dev/sdc1 /data
mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
You might have guessed it already. Now creating the same hexdumps as
before, now I get this:
# hexdump -C -n 131072 -v /dev/sdc > hexdump.reboot.sdc
# hexdump -C -n 131072 -v /dev/sdc1 > hexdump.reboot.sdc1
# grep EFI hexdump.reboot.*
hexdump.reboot.sdc:00000200 45 46 49 20 50 41 52 54 00 00 01 00 5c 00
00 00 |EFI PART....\...|
hexdump.reboot.sdc1:00000000 45 46 49 20 50 41 52 54 00 00 01 00 5c 00
00 00 |EFI PART....\...|
Opps, Why is the EFI part showing up in /dev/sdc1 now?
# grep XFSB hexdump.reboot.*
grep XFSB hexdump.reboot.*
hexdump.reboot.sdc:00004400 58 46 53 42 00 00 10 00 00 00 00 00 3d dc
8c a0 |XFSB........=...|
hexdump.reboot.sdc1:00004200 58 46 53 42 00 00 10 00 00 00 00 00 3d dc
8c a0 |XFSB........=...|
Just to enhance the readability slightly, I'll rerun the greps on all
hexdumps:
# grep EFI hexdump.*
hexdump.gen.sdc:00000200 45 46 49 20 50 41 52 54 00 00 01 00 5c 00 00
00 |EFI PART....\...|
hexdump.reboot.sdc:00000200 45 46 49 20 50 41 52 54 00 00 01 00 5c 00
00 00 |EFI PART....\...|
hexdump.reboot.sdc1:00000000 45 46 49 20 50 41 52 54 00 00 01 00 5c 00
00 00 |EFI PART....\...|
# grep XFSB hexdump.*
hexdump.gen.sdc:00004400 58 46 53 42 00 00 10 00 00 00 00 00 3d dc 8c
a0 |XFSB........=...|
hexdump.gen.sdc1:00000000 58 46 53 42 00 00 10 00 00 00 00 00 3d dc 8c
a0 |XFSB........=...|
hexdump.reboot.sdc:00004400 58 46 53 42 00 00 10 00 00 00 00 00 3d dc
8c a0 |XFSB........=...|
hexdump.reboot.sdc1:00004200 58 46 53 42 00 00 10 00 00 00 00 00 3d dc
8c a0 |XFSB........=...|
My conclusion here is: "Something" moves the boundary if /dev/sdc1
around, but I don't know what it is. /dev/sdc seems to be very constant.
Anyone?
Thanks for reading this far.
Carsten
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