topic Re: gfs - /dev/mapper block files ?? in Operating System - Linux

gfs - /dev/mapper block files ??

MikeL_4 — Thu, 18 Jun 2009 11:40:39 GMT

We are running Red Hat 5.3 in a 2 node Cluster with GFS file systems...

I've created a new gfs file system on the primary node, now how do I get the 2nd node to pick up these changes and create the /dev/mapper/???? device files for these new file systems so that I can mount them on the 2nd server ???

Re: gfs - /dev/mapper block files ??

Matti_Kurkela — Thu, 18 Jun 2009 12:37:51 GMT

Run "vgscan" to make the 2nd node detect the VG(s).

The /dev/mapper/* devices are created automatically when the VG is activated. They will also be removed automatically on each node when the VG is deactivated.

MK

Re: gfs - /dev/mapper block files ??

MikeL_4 — Thu, 18 Jun 2009 12:44:32 GMT

vgscan shows following... but do I need to do a vgchange to create the new /dev/mapper devices ?? new devices are datavg-lvol20 & lvol21

[root@ntpcdb2 ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "datavg" using metadata type lvm2
Found volume group "VolGroup00" using metadata type lvm2
[root@ntpcdb2 ~]#
[root@ntpcdb2 ~]# ls -al /dev/mapper/data*
brw-rw---- 1 root disk 253, 56 Jun 12 15:40 /dev/mapper/datavg-lvol0
brw-rw---- 1 root disk 253, 57 Jun 12 15:40 /dev/mapper/datavg-lvol1
brw-rw---- 1 root disk 253, 66 Jun 12 15:40 /dev/mapper/datavg-lvol10
brw-rw---- 1 root disk 253, 67 Jun 12 15:40 /dev/mapper/datavg-lvol11
brw-rw---- 1 root disk 253, 68 Jun 12 15:40 /dev/mapper/datavg-lvol12
brw-rw---- 1 root disk 253, 58 Jun 12 15:40 /dev/mapper/datavg-lvol2
brw-rw---- 1 root disk 253, 59 Jun 12 15:40 /dev/mapper/datavg-lvol3
brw-rw---- 1 root disk 253, 60 Jun 12 15:40 /dev/mapper/datavg-lvol4
brw-rw---- 1 root disk 253, 61 Jun 12 15:40 /dev/mapper/datavg-lvol5
brw-rw---- 1 root disk 253, 62 Jun 12 15:40 /dev/mapper/datavg-lvol6
brw-rw---- 1 root disk 253, 63 Jun 12 15:40 /dev/mapper/datavg-lvol7
brw-rw---- 1 root disk 253, 64 Jun 12 15:40 /dev/mapper/datavg-lvol8
brw-rw---- 1 root disk 253, 65 Jun 12 15:40 /dev/mapper/datavg-lvol9
[root@ntpcdb2 ~]#

Re: gfs - /dev/mapper block files ??

MikeL_4 — Thu, 18 Jun 2009 13:35:40 GMT

Thanks

vgchange -a y did it for me....