Which command updates /dev/mapper entries after partition deletion?
Heinz Mauelshagen
heinzm at redhat.com
Fri Mar 6 12:15:58 UTC 2009
Am Samstag, den 28.02.2009, 10:54 -0700 schrieb Curtis Gedak:
> 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?
Use "dmsetup remove /dev/mapper/..." on the respective partition device.
Heinz
>
> 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
>
> einfaches Textdokument-Anlage (dmraid-delete-partition.txt)
> *****
> ***** Print dmraid version information
> *****
>
> gedakc at 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 at quad:/dev/mapper$
>
>
> *****
> ***** Original listing of /dev/mapper directory after bootup.
> *****
>
> gedakc at 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 at 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 at 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 at 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 at 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 at quad:/dev/mapper$ sudo dmraid -ay
> RAID set "isw_cjdcbiheed_TestRaid" already active
>
>
> *****
> ***** Directory listing again
> *****
>
> gedakc at 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 at quad:/dev/mapper$ sudo dmraid -an
> gedakc at 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 at quad:/dev/mapper$ sudo dmsetup remove /dev/mapper/isw_cjdcbiheed_TestRaid6
> gedakc at quad:/dev/mapper$ sudo dmraid -an
> RAID set "isw_cjdcbiheed_TestRaid1" is not active
> RAID set "isw_cjdcbiheed_TestRaid5" is not active
> gedakc at 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 at quad:/dev/mapper$ sudo dmraid -ay
> gedakc at 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 at quad:/dev/mapper$
>
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