[linux-lvm] Problem with creation of dev entries on SL (RHEL) 4

[linux-lvm] Problem with creation of dev entries on SL (RHEL) 4

[Stephen Childs]

When I create a new LVM volume on Scientific Linux 4 (RHEL4-compatible), a 
new entry isn't created in /dev, meaning that I can't access the volume 
although it exists.

Creation succeeds:

[root@tg23 mapper]# /usr/sbin//lvcreate -s '-L1024M' -n 
'/dev/xenvg/gridmon_gridmon023__1147860249' /dev/xenvg/gridmon
   Logical volume "gridmon_gridmon023__1147860249" created

Mount fails:

[root@tg23 mapper]# mount '/dev/xenvg/gridmon_gridmon023__1147860249' 
'/mnt/gridmon_gridmon023__1147860249'
mount: special device /dev/xenvg/gridmon_gridmon023__1147860249 does not exist

dev entry doesn't exist:

[root@tg23 mapper]# ls /dev/xenvg/gridmon_gridmon023__1147860249
ls: /dev/xenvg/gridmon_gridmon023__1147860249: No such file or directory

These were created before an upgrade from RH9:

[root@tg23 mapper]# ls /dev/xenvg/
gridgate_gridgate_wit_ie__1127224256    gridmon_gridmon__swap 
     sl304_1                   wnclonetest
gridmon_gridmon_ait_ie__swap            gridmon_gridmon_ucc_ie__swap 
     sl304_lfc__swap           wnclonewn50
gridmon_gridmon_grid_ul_ie__1127238733 
gridstore_gridstore_grid_ul_ie__swap  sl304_lfc.testgrid__swap
gridmon_gridmon_it-tallaght_ie__swap    gridui_gridui_dit_ie__swap 
     ttyl2base
gridmon_gridmon_scg_nuigalway_ie__swap  rh9server 
     wnclonecagnode89

I have the following error in /var/log/messages:

May 17 12:47:10 tg23 /sbin/hotplug: no runnable /etc/hotplug/block.agent 
is installed

I have the default hotplug package installed and can't find any source for 
  a hotplug block.agent.

Any ideas?


Stephen

Re: [linux-lvm] Problem with creation of dev entries on SL (RHEL) 4

[Luca Berra]

On Wed, May 17, 2006 at 12:50:01PM +0100, Stephen Childs wrote:
>When I create a new LVM volume on Scientific Linux 4 (RHEL4-compatible), a 
>new entry isn't created in /dev, meaning that I can't access the volume 
>although it exists.
>
>Creation succeeds:
>
>[root@tg23 mapper]# /usr/sbin//lvcreate -s '-L1024M' -n 
>'/dev/xenvg/gridmon_gridmon023__1147860249' /dev/xenvg/gridmon
>   Logical volume "gridmon_gridmon023__1147860249" created
>
>Mount fails:
....
>Any ideas?
>
Weird, but your command line is also weird could you try without
prefixing the vg name to -the -n parameter?

lvcreate -s -L1024M -n gridmon_gridmon023__1147860249 /dev/xenvg/gridmon

else look into the log section of /etc/lvm.conf and provide some logs.

L.

-- 
Luca Berra -- bluca@comedia.it
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Re: [linux-lvm] Problem with creation of dev entries on SL (RHEL) 4

[Stephen Childs]

Here's some snippets from the log:

activate/fs.c:176   Linking /dev/xenvg/gridmon_gridmon023__1147860249 -> 
/dev/mapper/xenvg-gridmon_gridmon023__1147860249
toollib.c:1087   Zeroing start of logical volume 
"gridmon_gridmon023__1147860249"
device/dev-cache.c:228   /dev/xenvg/gridmon_gridmon023__1147860249: Added 
to device cache
device/dev-io.c:425   Opened /dev/xenvg/gridmon_gridmon023__1147860249 RW 
O_DIRECT
device/dev-io.c:584   Wiping /dev/xenvg/gridmon_gridmon023__1147860249 at 
sector 0 length 8 sectors
device/dev-io.c:134   /dev/xenvg/gridmon_gridmon023__1147860249: block 
size is 4096 bytes
device/dev-io.c:456   Closed /dev/xenvg/gridmon_gridmon023__1147860249




metadata/metadata.c:1164   Found volume group "xenvg"
activate/dev_manager.c:1048   Getting device info for 
xenvg-gridmon_gridmon023__1147860249
ioctl/libdm-iface.c:1326   dm info 
IgMc4AcnOILtiudkjAXpuErUegVxunX66lb1awfZBR5rYYzIF64ogYnf98AcKHS0 O
mm/memlock.c:119   Unlocking memory
mm/memlock.c:138   memlock_count dec to 0
activate/fs.c:211   Removing link /dev/xenvg/gridmon_gridmon023__1147860249

The volume appears briefly in the /dev/mapper directory and then 
disappears again! How is this meant to work?

Stephen
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