MC/SG - Mixed OS - Migration path

[Co van Berkel]

Hi,
We have two L2000 servers in a MC/SG cluster.
They run on HP-UX 11.0 and MC/SG (A.11.12).
Also the extern storage is on a SC10 disk-cabinet.

We want to migrate to two rp4440-8 servers with HP-UX 11.11 (11i v1).

Is it possible to add these new servers into the current cluster so migration wil be easy?
Are there more pitfalls I have to think of?

CvB

[melvyn burnard]

Yes it can be done, with careful planning.

Two things to think about first:
A) you have SC10 SCSI discs, so you would need to have connectivity between the new nodes added using Y cables (if they exist any more).
B) A 2 node cluster must have a cluster lock mechanism, and I suspect you are using cluster lock disc rather than Quorum Server. This will complicate it a bit

Next, SG 11.12 is not supported on HP-UX 11.11, so you would need to upgrade the existing cluster nodes to 11.14, and patch PHSS_31015.

Then you connect the two new nodes into the network, insuring all networking is set and tested, including checking host/ip lookups all work correctly.

You then install SG 11.14 and patch on both new nodes, set up the security files on all 4 nodes (.rhosts or cmclnodelist)then use cmquerycl to build a new ascii file, e.g. cmquerycl -v -C /etc/cmcluster/newascii -n nodea -n nodeb -n nodec -n noded
and compare this to your exisiting cluster ascii file.

If you have the full disc connectivity set up, you can then use the ascii file to reapply the binary by adding a node into the running cluster, as documented in:
http://docs.hp.com/hpux/pdf/B3936-90065.pdf

If not, then you will have to halt the runing cluster, delete the old binary with cmdeleteconf, and then re-apply a new binary without the cluster lock info, or preferably set up a quorum server outside the cluster using the free QS software. I say this because if you do not have either QS or a cluster lock disc, when you come to remove the two older nodes, then you will be back to a 2 node cluster which must have some form of cluster lock.

Just an overview, and make sure you always have a fall back plan with backups put away.

[Co van Berkel]

Hi Melvyn,
You say "Install MC/SG 11.14 + PHSS_31015 on the new servers?
Is MC/SG 11.14 + PHSS_31015 supported on HP-UX 11.11 (11i v1)?

CvB

[Co van Berkel]

Hi Melvyn,

Yep, we have two SCSI cables with inline terminators waiting for use:
- â A5669A - 5M VHDCI to VHDCI SCSI LVD I/Lâ (INLINE TERMINATOR)
These cables where used for a third node in a other two node-cluster with two SC10's.

There is a lock-disk defined in cmclconf.ascii:
- FIRST_CLUSTER_LOCK_VG /dev/vg01
- FIRST_CLUSTER_LOCK_PV /dev/dsk/c4t9d

[melvyn burnard]

yes it is.
11.14 is the last release to be supported on HP-UX 11.00, but it is also suported for 11i

[Co van Berkel]

Hi,
a. Are there any know issues with upgrading MC/SG 11.12 to 11.14 + PHSS_13051?
b. How can I find out what extra patches are needed when installing MC/SG 11.14?
c. Can I use SAM when installing the nieuw version of MC/SG + patche(es) on both nodes or only on the fist node and than ??????

CvB.

[Co van Berkel]

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