Partprobe is a fantastically useful too. It is absolutely
vital to access new partitions without rebooting, as
well as easily get to partitions on a mapped device.
However, I am having a large problem with it now
on a 4096 byte sector hard drive.
All of the filesystem tools work fine on the raw
device. However, since I want encryption (AND
separate partitions), I did:
# cryptsetup -v luksFormat /dev/sdx
WARNING!
========
This will overwrite data on /dev/sdd irrevocably.
Are you sure? (Type uppercase yes): YES
Enter passphrase:
Verify passphrase:
Command successful.
# cryptsetup open /dev/sdx disk
Enter passphrase for /dev/sdx:
# ls -al /dev/mapper/
total 0
drwxr-xr-x 2 root root 120 2014-10-07 03:35:21 ./
drwxr-xr-x 17 root root 5480 2014-10-07 03:35:21 ../
crw------- 1 root root 10, 236 2014-07-28 15:33:13 control
lrwxrwxrwx 1 root root 7 2014-10-07 03:35:21 disk -> ../dm-0
# gdisk /dev/mapper/disk
GPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present
Creating new GPT entries.
Command (? for help): n
Partition number (1-128, default 1): 1
First sector (6-732566127, default = 256) or {+-}size{KMGTP}:
Last sector (256-732566127, default = 732566127) or {+-}size{KMGTP}: +8G
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'
Command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/mapper/disk.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.
# gdisk -l /dev/mapper/disk
GPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Disk /dev/mapper/disk: 732566133 sectors, 2.7 TiB
Logical sector size: 4096 bytes
Disk identifier (GUID): AF876611-E58D-481A-8836-3FF2CBF581D3
Partition table holds up to 128 entries
First usable sector is 6, last usable sector is 732566127
Partitions will be aligned on 256-sector boundaries
Total free space is 730468970 sectors (2.7 TiB)
Number Start (sector) End (sector) Size Code Name
1 256 2097407 8.0 GiB 8300 Linux filesystem
# /usr/sbin/partprobe
# ls -al /dev/mapper/
total 0
drwxr-xr-x 2 root root 140 2014-10-07 04:39:33 ./
drwxr-xr-x 17 root root 5500 2014-10-07 04:39:33 ../
crw------- 1 root root 10, 236 2014-07-28 15:33:13 control
lrwxrwxrwx 1 root root 7 2014-10-07 04:39:33 disk -> ../dm-0
brw------- 1 root root 253, 3 2014-10-07 04:39:33 disk1
# mke2fs -b 4096 -L disk -m 0 -v /dev/mapper/disk1
mke2fs 1.42.10 (18-May-2014)
fs_types for mke2fs.conf resolution: 'ext2'
Filesystem label=disk
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
65536 inodes, 262144 blocks
0 blocks (0.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Filesystem UUID: 678b1ec9-9442-4af2-936b-e353a886b227
Superblock backups stored on blocks:
32768, 98304, 163840, 229376
Allocating group tables: done
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
# mount /dev/mapper/disk1 /mnt/disk/
# df
[...]
/dev/mapper/disk1 1032088 1284 1030804 1% /mnt/disk
# dd bs=1048576 if=/dev/zero of=/mnt/disk/file
dd: error writing ‘/mnt/disk/file’: No space left on device
1006+0 records in
1005+0 records out
1054507008 bytes (1.1 GB) copied, 24.6156 s, 42.8 MB/s
# df
[...]
/dev/mapper/disk1 1032088 1032088 0 100% /mnt/disk
I could show the results of more tools, but you get the idea -
there is only 1 GB of the 8 GB partition available. I suspect
(but don't know for certain) that partprobe is not passing
the correct parameters to the device mapper.
Thanks in advance for your help.
Nuzhna
