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Bug 167440

Summary: fdisk on /dev/mapper/xxxx entries gives error when re-reading modified partition table
Product: Red Hat Enterprise Linux 4 Reporter: Stoo Davies <sdavies>
Component: device-mapper-multipathAssignee: Alasdair Kergon <agk>
Status: CLOSED DUPLICATE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: bpeck, christophe.varoqui
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Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2005-10-03 22:17:19 UTC Type: ---
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Description Stoo Davies 2005-09-02 17:35:39 UTC
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Description of problem:
I am doing some initial testing on RHES4-U2 beta release, in particular I'm testing dm-multipath/multipath-tools with a 3PAR storage array.
 
When trying to partition the /dev/mapper/xxxxx devices fdisk gives the following error...
 
-----------------------------------------------------------------
Command (m for help): w
The partition table has been altered!
 
Calling ioctl() to re-read partition table.
 
WARNING: Re-reading the partition table failed with error 22: Invalid argument.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
-----------------------------------------------------------------

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
Setup a multipathed device with the multipath command
Run fdisk on the created disk device
Save out partition table


Actual Results:  Table was not re-read

Expected Results:  Table should of been re-read and used by the kernel

Additional info:

Comment 1 Alasdair Kergon 2005-10-03 22:17:19 UTC
The kernel can't use the partition tables on these devices.

Instead we run 'kpartx' to set them up from userspace using device-mapper.

*** This bug has been marked as a duplicate of 160277 ***