Attaching To Multiple Rs/6000 Or Pseries Hosts Without The Hacmp Host System; Considerations For Attaching To Multiple Rs/6000 Or Pseries Hosts Without The Hacmp Host System; Saving Data On The Storage Unit When Attaching Multiple Rs/6000 Or Pseries Host Systems To The Storage Unit - IBM TotalStorage DS6000 Attachment Manual

For a list of open systems hosts, operating systems, adapters and switches that
IBM supports, see the Interoperability Matrix at
http://www.ibm.com/servers/storage/disk/ds6000/interop.html.
Attaching to multiple RS/6000 or pSeries hosts without the HACMP
host system
This section provides the instructions to attach one or two storage units to multiple
host systems without the High Availability Cluster Multi-Processing (HACMP
clustering solution.
Considerations for attaching to multiple RS/6000 or pSeries hosts
without the HACMP host system
This topic provides considerations for attaching to multiple RS/6000 or pSeries
hosts without the HACMP host system.
Install HACMP to define and access a unique journaled file system (JFS) file stored
on a single storage unit from any attached host system.
When attaching multiple host systems to a storage unit, consider the following:
v Multiple host systems cannot access the same volume group or the same
v Without HACMP, some system failure management features such as failover are
v You must vary on and mount the volume groups and journaled file systems every
v The storage unit does not allow ownership of volume groups to move from one
v When you use this procedure, you can define between 2 - 4 multiple host
Saving data on the storage unit when attaching multiple RS/6000 or
pSeries host systems to the storage unit
You can save data on the storage unit when attaching multiple RS/6000 or pSeries
host systems to the storage unit.
Perform the following steps to preserve the data that is stored on a storage unit that
was previously installed and connected to a host system. This procedure does not
erase the data on the storage unit, but it removes the volume groups from the host
system:
1. Type umount to unmount all file systems from all host systems connected to the
2. Type fsck on each of the file systems on the storage unit to verify the file
3. Type varyoffvg to vary off all the storage unit volume groups from all of the
4. Type exportvg to remove all of the storage unit volume groups from all the host
5. Type rmdev -ld hdiskx to delete all physical volumes (hdisks) on each host
journaled file system simultaneously.
not available. Therefore, a failure on the storage unit or any one of the connected
host systems will most likely affect the availability of the other connected devices.
time you start the system.
system to another.
systems.
storage unit.
system integrity.
host systems connected to the storage unit.
systems connected to the storage unit.
system that is associated with the storage unit.
Chapter 9. Attaching to an IBM RS/6000 or IBM eServer pSeries host
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