On Fri, 30 Mar 2012 13:14:37 -0400 (EDT), Mark Post wrote:
>
> On 3/30/2012 at 07:28 AM, Stephen Powell <zlinux...@wowway.com> wrote:
>>
>> Try issuing the command again, this time without "ext2" specified at the
>> end.
>> i.e.
>>
>> resize 1 98.3kb 2462MB
>
> parted is not going to work with ECKD devices, period.
That's not true. parted does have support for resizing partitions on
ECKD devices, as long as the disk is formatted in cdl layout. The problem
is that if it recognizes a file system on the partition that it is resizing,
it tries to resize the file system too; and that seldom works because the
file system code doesn't support file system options that are usually in
effect these days. The ext2 file system options supported by parted
for the resize operation are as follows:
has_journal
dir_index
filetype
sparse_super
large_file
If other options are in effect, such as ext_attr or resize_inode for
example, parted will fail the entire operation. However, the "rm"
and "mkpart" commands of parted, followed by the resize2fs command,
can accomplish the same thing. I tested this on my system. Here is
a sample console session. Note that I took the device offline and
brought it back online a number of times. I don't know if all of those
sequences were necessary, but I threw them in for good measure. It
forces a flush of buffers when going offline, and forces the kernel
to re-read certain things when coming back online.
Note that, in theory, fdasd could be used, rather than parted, to
create, delete, then re-create the partition at a larger size,
provided that fdasd doesn't write anything to the partition when
it deletes it. I don't know enough about fdasd to know if that is
the case. The old MSDOS fdisk program was known to write out a
few blocks of binary zeros to the beginning of a partition when
it deleted it. This, of course, destroys the usability of the data
in the partition. I know that parted does not do this.
Also note that I manipulated the partition table in logical sectors
(unit s), which is 512 bytes. There are eight logical sectors for
each 4K physical block.
-----
debian3:~# cat /proc/dasd/devices
0.0.0200(DIAG) at ( 94: 0) is dasda : active at blocksize: 4096,
600840 blocks, 2347 MB
0.0.0203(DIAG) at ( 94: 4) is dasdb : active at blocksize: 4096,
90000 blocks, 351 MB
0.0.0202(DIAG) at ( 94: 8) is dasdc : active at blocksize: 4096,
90000 blocks, 351 MB
0.0.0201(ECKD) at ( 94: 12) is dasdd : active at blocksize: 4096,
13500 blocks, 52 MB
debian3:~# vmcp DEFINE T3390 0204 2
DASD 0204 DEFINED
echo 1 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# cat /proc/dasd/devices
0.0.0200(DIAG) at ( 94: 0) is dasda : active at blocksize: 4096,
600840 blocks, 2347 MB
0.0.0203(DIAG) at ( 94: 4) is dasdb : active at blocksize: 4096,
90000 blocks, 351 MB
0.0.0202(DIAG) at ( 94: 8) is dasdc : active at blocksize: 4096,
90000 blocks, 351 MB
0.0.0201(ECKD) at ( 94: 12) is dasdd : active at blocksize: 4096,
13500 blocks, 52 MB
0.0.0204(ECKD) at ( 94: 16) is dasde : unformatted
debian3:~# dasdfmt -b 4096 -l DEB204 -d cdl /dev/dasde
Drive Geometry: 2 Cylinders * 15 Heads = 30 Tracks
I am going to format the device /dev/dasde in the following way:
Device number of device : 0x204
Labelling device : yes
Disk label : VOL1
Disk identifier : DEB204
Extent start (trk no) : 0
Extent end (trk no) : 29
Compatible Disk Layout : yes
Blocksize : 4096
--->> ATTENTION! <<---
All data of that device will be lost.
Type "yes" to continue, no will leave the disk untouched: yes
Formatting the device. This may take a while (get yourself a coffee).
Finished formatting the device.
Rereading the partition table... ok
debian3:~# cat /proc/dasd/devices
0.0.0200(DIAG) at ( 94: 0) is dasda : active at blocksize: 4096,
600840 blocks, 2347 MB
0.0.0203(DIAG) at ( 94: 4) is dasdb : active at blocksize: 4096,
90000 blocks, 351 MB
0.0.0202(DIAG) at ( 94: 8) is dasdc : active at blocksize: 4096,
90000 blocks, 351 MB
0.0.0201(ECKD) at ( 94: 12) is dasdd : active at blocksize: 4096,
13500 blocks, 52 MB
0.0.0204(ECKD) at ( 94: 16) is dasde : active at blocksize: 4096, 360
blocks, 1 MB
debian3:~# parted /dev/dasde unit s print free
Model: IBM S390 DASD drive (dasd)
Disk /dev/dasde: 2880s
Sector size (logical/physical): 512B/4096B
Partition Table: dasd
Number Start End Size File system Flags
192s 2879s 2688s Free Space
debian3:~# parted /dev/dasde unit s mkpart 192 1439
Information: You may need to update /etc/fstab.
debian3:~# echo 0 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# echo 1 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# parted /dev/dasde unit s print free
Model: IBM S390 DASD drive (dasd)
Disk /dev/dasde: 2880s
Sector size (logical/physical): 512B/4096B
Partition Table: dasd
Number Start End Size File system Flags
1 192s 1439s 1248s lvm
1440s 2879s 1440s Free Space
debian3:~# mke2fs -L DEB204A -t ext2 /dev/dasde1
mke2fs 1.42.1 (17-Feb-2012)
Filesystem label=DEB204A
OS type: Linux
Block size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
96 inodes, 156 blocks
7 blocks (4.49%) reserved for the super user
First data block=0
1 block group
32768 blocks per group, 32768 fragments per group
96 inodes per group
Allocating group tables: done
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
debian3:~# echo 0 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# echo 1 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# parted /dev/dasde unit s print free
Model: IBM S390 DASD drive (dasd)
Disk /dev/dasde: 2880s
Sector size (logical/physical): 512B/4096B
Partition Table: dasd
Number Start End Size File system Flags
1 192s 1439s 1248s ext2
1440s 2879s 1440s Free Space
debian3:~# mount /dev/dasde1 /mnt
debian3:~# echo It\ works\! >/mnt/test.txt
debian3:~# cat /mnt/test.txt
It works!
debian3:~# umount /mnt
debian3:~# parted /dev/dasde unit s rm 1
Information: You may need to update /etc/fstab.
debian3:~# parted /dev/dasde unit s mkpart 192 2879
Information: You may need to update /etc/fstab.
debian3:~# echo 0 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# echo 1 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# parted /dev/dasde unit s print free
Model: IBM S390 DASD drive (dasd)
Disk /dev/dasde: 2880s
Sector size (logical/physical): 512B/4096B
Partition Table: dasd
Number Start End Size File system Flags
1 192s 2879s 2688s ext2
debian3:~# resize2fs /dev/dasde1
resize2fs 1.42.1 (17-Feb-2012)
Resizing the filesystem on /dev/dasde1 to 336 (4k) blocks.
The filesystem on /dev/dasde1 is now 336 blocks long.
debian3:~# echo 0 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# echo 1 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# mount /dev/dasde1 /mnt
debian3:~# cat /mnt/test.txt
It works!
debian3:~# umount /mnt
debian3:~# echo 0 >/sys/bus/ccw/devices/0.0.0204/online
debian3:~# vmcp DETACH VIRTUAL 0204
DASD 0204 DETACHED
debian3:~#
-----
--
.''`. Stephen Powell
: :' :
`. `'`
`-
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