InfoScale™ 9.0 Cluster Server Bundled Agents Reference Guide - Solaris

Support for loopback file system

The Mount agent provides loopback file system support. You can manage the loopback file system as a Mount resource. You can use this loopback support to mount a file system in the global zone and share it in non-global zones. For loopback support, configure the FSType attribute to use a value of lofs.

Figure: Sample service group for the zone root on shared storage with a loopback file system when VCS manages the loopback file system as a Mount resource

The following is a sample configuration where you use the Mount resource to manage the lofs file system:

group loopbacksg (
SystemList = { sysA = 0, sysB = 1 }
ContainerInfo@sysA = { Name = zone1, Type = Zone, Enabled = 1 }
ContainerInfo@sysB = { Name = zone1, Type = Zone, Enabled = 1 }
)
Mount lofs_mnt_global_to_local (
MountPoint = "/export/home/zone1/root/lofs_mnt"
BlockDevice = "/mnt1/m1"
FSType = lofs
)
Zone z1 (
)
Mount base_mnt (
MountPoint = "/mnt1"
BlockDevice = "/dev/vx/dsk/tdg/tvol1"
FSType = vxfs
FsckOpt = "-y"
)
lofs_mnt_global_to_local requires z1
lofs_mnt_global_to_local requires base_mnt

In the following sample configuration, the local zone (zone1) runs only on system 1 (sys1) and it does not exist in system 2 (sys2). The mount resource comes online inside the zone. On system 1, the "/export/home/zone1/root/mnt" mount point exists inside the zone. On system 1, the "/export/home" mount point is mounted on "/export/home/zone1/root/mnt" inside the zone. On system 2, the "/export/home" mount point is mounted on "/mnt" in the global zone.

group mountgrp (
         SystemList = { sys1 = 0, sys2 = 1 }
         ContainerInfo @sys1 = { Name = zone1, Type = Zone, Enabled = 1 }
         ContainerInfo @sys2 = { Name = zone1, Type = Zone, Enabled = 2 }
         Administrators = { z_mountres_sys1, z_zoneres_sys1 }
         )
 
 
         Mount loopback (
                 MountPoint @sys1 = "/export/home/zone1/root/mnt"
                 MountPoint @sys2 = "/mnt"
                 BlockDevice = "/export/home"
                 FSType = lofs
                 FsckOpt = "-n"
                 )
 
         Zone zoneres (
                 )
 
         loopback requires zoneres

In the following sample configuration, there are two mount resources. The first mount resource (mountres) mounts the actual shared volume "/dev/vx/dsk/vdg/nfs_vol" on "/lockinfo". Next, "/lockinfo" is loop-backed on "/export/home/zone1/root/mnt" inside the zone on system 1. On system 2, the "/dev/vx/dsk/vdg/nfs_vol" volume is mounted on "/lockinfo" and then "/lockinfo" is loop-backed and mounted on "/mnt" in the global zone. In the following example, localization has been done for the mount resource.:

group mountgrp (
         SystemList = { sys1 = 0, sys2 = 1 }
         ContainerInfo @sys1 = { Name = zone1, Type = Zone, Enabled = 1 }
         ContainerInfo @sys2 = { Name = zone1, Type = Zone, Enabled = 2 }
         Administrators = { z_mountres_sys1, z_zoneres_sys1 }
         )
 
         DiskGroup dgres (
                 DiskGroup = vdg
                 )
 
         Mount loopback (
                 MountPoint @sys1 = "/export/home/zone1/root/mnt"
                 MountPoint @sys2 = "/mnt"
                 BlockDevice = "/lockinfo"
                 FSType = lofs
                 FsckOpt = "-n"
                 )
 
         Mount mountres (
                 MountPoint = "/lockinfo"
                 BlockDevice = "/dev/vx/dsk/vdg/nfs_vol"
                 FSType = vxfs
                 FsckOpt = "-y"
                 )
 
         Zone zoneres (
                 )
 
         loopback requires mountres
         loopback requires zoneres
         mountres requires dgres