Bug 189832 - dmsetup remove_all does not work
dmsetup remove_all does not work
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: device-mapper (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Alasdair Kergon
: 189831 189834 (view as bug list)
Depends On:
Blocks: 176344
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Reported: 2006-04-24 18:57 EDT by Dinesh Surpur
Modified: 2010-01-11 21:16 EST (History)
7 users (show)

See Also:
Fixed In Version: RHBA-2007-0284
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2007-05-01 18:42:51 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Dinesh Surpur 2006-04-24 18:57:00 EDT
Description of problem:

I am running RH4 U3 and when i issue dmsetup remove_all i do not see the 
device links removed from /dev/mapper/<MP Device>. dmsetup table shows the 
devices were removed and /var/log/messages also shows the device removed. 
Issuing multipath -F does not help.  

Version-Release number of selected component (if applicable):
RH4 U3
# rpm -qa | grep -i device

How reproducible:
1. Export the storage volumes to the host
2. Issue "echo "scsi add-single-device"" to add the device to the scsi layer
3. issue multipath command (i had disablad user_friendly_names)
The following /etc/multipath.conf was used
defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            /bin/true
        rr_min_io               100
        rr_weight               priorities
        failback                immediate
        user_friendly_names     no

devnode_blacklist {
       wwid 26353900f02796769
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^hd[a-z]"
        devnode "^cciss!c[0-9]d[0-9]*"
        devnode "sda"

devices {
       device {
               vendor                  "3PARdata"
               product                 "VV"
               path_grouping_policy    multibus
               path_checker            tur       
               no_path_retry           60

4. ls  /dev/mapper
control 350002ac00d58003e 350002ac00d58003e1

5. dmsetup remove_all

From /var/log/messages
multipathd: dm map 350002ac00d58003e removed

6. ls /dev/mapper
control 350002ac00d58003e 350002ac00d58003e1 -- I still see the link

7. multipath -F 
# ls /dev/mapper
control 350002ac00d58003e 350002ac00d58003e1 -- I still see the link

8. dmsetup
dmsetup table
No devices found 

9. cat /proc/partitions -- shows no dm devices.

Things work correctly if dmsetup remove <device> is used. 

This is also causing issues when you use kpartx command it is not adding the 
partition existed on the device with the following error:

Apr 24 14:42:13 sqa-dell2850-01 hal.hotplug[16195]: timout(10000 ms) waiting 
for /block/dm-20
Apr 24 14:42:13 sqa-dell2850-01 hal.hotplug[16200]: timout(10000 ms) waiting 
for /block/dm-20

There is no /dev/dm-20 created

Steps to Reproduce:
Actual results:

Expected results:

Additional info:
Comment 1 Alasdair Kergon 2006-05-22 17:52:43 EDT
*** Bug 189834 has been marked as a duplicate of this bug. ***
Comment 2 Alasdair Kergon 2006-05-22 17:52:54 EDT
*** Bug 189831 has been marked as a duplicate of this bug. ***
Comment 3 Alasdair Kergon 2006-05-22 18:01:23 EDT
dmsetup remove_all issues an instruction to the kernel device-mapper to attempt
to remove all its devices.  This is similar to 'lvmchange -R' in the original
version of LVM on 2.4.

To reset /dev/mapper afterwards you need to issue 'dmsetup mknodes'.

Perhaps there's a case for providing a new option that runs both commands at once.
Comment 4 Alasdair Kergon 2006-07-05 13:31:53 EDT
Included in 1.02.08.
Comment 5 RHEL Product and Program Management 2006-08-18 12:07:11 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 9 Red Hat Bugzilla 2007-05-01 18:42:52 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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