When a new partition is created, the "dmraid -ay" command can be used to
create the missing entry in /dev/mapper. The opposite situation does
not appear to work wherein I delete a partition.
Which command should be used to remove and/or update the /dev/mapper
entries when a partition is deleted?
Attached is a log of my session where I used parted to delete a
partition, and then tried to delete all the /dev/mapper entries with
"dmraid -an".
Regards,
Curtis Gedak
Maintainer of GParted
*****
***** Print dmraid version information
*****
gedakc@quad:/dev/mapper$ sudo dmraid --version
dmraid version: 1.0.0.rc14 (2006.11.08)
dmraid library version: 1.0.0.rc14 (2006.11.08)
device-mapper version: 4.12.0
gedakc@quad:/dev/mapper$
*****
***** Original listing of /dev/mapper directory after bootup.
*****
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 140 2009-02-28 09:04 ./
drwxr-xr-x 13 root root 14520 2009-02-28 09:05 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
brw-rw---- 1 root disk 254, 0 2009-02-28 09:04 isw_cjdcbiheed_TestRaid
brw-rw---- 1 root disk 254, 1 2009-02-28 09:04 isw_cjdcbiheed_TestRaid1
brw-rw---- 1 root disk 254, 2 2009-02-28 09:04 isw_cjdcbiheed_TestRaid5
brw-rw---- 1 root disk 254, 3 2009-02-28 09:04 isw_cjdcbiheed_TestRaid6
*****
***** Delete partition number 5 using parted
***** NOTE: The error messages are related to parted failing to inform
***** the kernel of the partition layout change. I believe this
***** is because /dev/mapper devices do not use a kernel ioctl call
***** to reread the partition table
*****
gedakc@quad:/dev/mapper$ sudo parted /dev/mapper/isw_cjdcbiheed_TestRaid
GNU Parted 1.8.8.1.115-d53a
Using /dev/mapper/isw_cjdcbiheed_TestRaid
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit s
unit s
(parted) print
print
Model: Unknown (unknown)
Disk /dev/mapper/isw_cjdcbiheed_TestRaid: 312494080s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 63s 224909s 224847s primary ext2
2 224910s 312480314s 312255405s extended
6 15872283s 43889579s 28017297s logical reiserfs
5 307741203s 312480314s 4739112s logical ntfs
(parted) rm 5
rm 5
Error: Error informing the kernel about modifications to partition
/dev/mapper/isw_cjdcbiheed_TestRaid1 -- Invalid argument. This means Linux
won't know about any changes you made to /dev/mapper/isw_cjdcbiheed_TestRaid1
until you reboot -- so you shouldn't mount it or use it in any way before
rebooting.
Ignore/Cancel? ignore
ignore
Error: Error informing the kernel about modifications to partition
/dev/mapper/isw_cjdcbiheed_TestRaid2 -- Invalid argument. This means Linux
won't know about any changes you made to /dev/mapper/isw_cjdcbiheed_TestRaid2
until you reboot -- so you shouldn't mount it or use it in any way before
rebooting.
Ignore/Cancel? Ignore
Ignore
Error: Error informing the kernel about modifications to partition
/dev/mapper/isw_cjdcbiheed_TestRaid5 -- Invalid argument. This means Linux
won't know about any changes you made to /dev/mapper/isw_cjdcbiheed_TestRaid5
until you reboot -- so you shouldn't mount it or use it in any way before
rebooting.
Ignore/Cancel? Ignore
Ignore
(parted) print
print
Model: Unknown (unknown)
Disk /dev/mapper/isw_cjdcbiheed_TestRaid: 312494080s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 63s 224909s 224847s primary ext2
2 224910s 312480314s 312255405s extended
5 15872283s 43889579s 28017297s logical reiserfs
(parted) quit
quit
Information: You may need to update /etc/fstab.
*****
***** List the /dev/mapper entries again.
***** NOTE: No dmraid commands have been executed
*****
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 140 2009-02-28 09:04 ./
drwxr-xr-x 13 root root 14520 2009-02-28 09:05 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
brw-rw---- 1 root disk 254, 0 2009-02-28 10:28 isw_cjdcbiheed_TestRaid
brw-rw---- 1 root disk 254, 1 2009-02-28 09:04 isw_cjdcbiheed_TestRaid1
brw-rw---- 1 root disk 254, 2 2009-02-28 09:04 isw_cjdcbiheed_TestRaid5
brw-rw---- 1 root disk 254, 3 2009-02-28 09:04 isw_cjdcbiheed_TestRaid6
*****
***** Try to remove the /dev/mapper entires using dmraid command
*****
gedakc@quad:/dev/mapper$ sudo dmraid -an
*****
***** NOTE: Two entries remain. My guess is that the
***** isw_cjdcbiheed_TestRaid6 exists because it was in a logical
***** partition of an MSDOS partition table.
*****
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 100 2009-02-28 10:29 ./
drwxr-xr-x 13 root root 14520 2009-02-28 09:05 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
brw-rw---- 1 root disk 254, 0 2009-02-28 10:28 isw_cjdcbiheed_TestRaid
brw-rw---- 1 root disk 254, 3 2009-02-28 09:04 isw_cjdcbiheed_TestRaid6
*****
***** Try to recreate the /dev/mapper entries
*****
gedakc@quad:/dev/mapper$ sudo dmraid -ay
RAID set "isw_cjdcbiheed_TestRaid" already active
*****
***** Directory listing again
*****
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 140 2009-02-28 10:29 ./
drwxr-xr-x 13 root root 14520 2009-02-28 10:29 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
brw-rw---- 1 root disk 254, 0 2009-02-28 10:28 isw_cjdcbiheed_TestRaid
brw-rw---- 1 root disk 254, 1 2009-02-28 10:29 isw_cjdcbiheed_TestRaid1
brw-rw---- 1 root disk 254, 2 2009-02-28 10:29 isw_cjdcbiheed_TestRaid5
brw-rw---- 1 root disk 254, 3 2009-02-28 09:04 isw_cjdcbiheed_TestRaid6
*****
***** NOTE:
***** If I remove all /dev/mapper entries (excluding control of course :-),
***** then I can use "dmraid -ay" to create the proper /dev/mapper entries.
*****
gedakc@quad:/dev/mapper$ sudo dmraid -an
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 100 2009-02-28 10:49 ./
drwxr-xr-x 13 root root 14520 2009-02-28 10:29 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
brw-rw---- 1 root disk 254, 0 2009-02-28 10:28 isw_cjdcbiheed_TestRaid
brw-rw---- 1 root disk 254, 3 2009-02-28 09:04 isw_cjdcbiheed_TestRaid6
gedakc@quad:/dev/mapper$ sudo dmsetup remove /dev/mapper/isw_cjdcbiheed_TestRaid6
gedakc@quad:/dev/mapper$ sudo dmraid -an
RAID set "isw_cjdcbiheed_TestRaid1" is not active
RAID set "isw_cjdcbiheed_TestRaid5" is not active
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 60 2009-02-28 10:49 ./
drwxr-xr-x 13 root root 14520 2009-02-28 10:29 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
gedakc@quad:/dev/mapper$ sudo dmraid -ay
gedakc@quad:/dev/mapper$ ll
total 0
drwxr-xr-x 2 root root 120 2009-02-28 10:49 ./
drwxr-xr-x 13 root root 14520 2009-02-28 10:49 ../
crw-rw---- 1 root root 10, 63 2009-02-28 09:04 control
brw-rw---- 1 root disk 254, 0 2009-02-28 10:49 isw_cjdcbiheed_TestRaid
brw-rw---- 1 root disk 254, 1 2009-02-28 10:49 isw_cjdcbiheed_TestRaid1
brw-rw---- 1 root disk 254, 2 2009-02-28 10:49 isw_cjdcbiheed_TestRaid5
gedakc@quad:/dev/mapper$
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