MC/serviceGuard

[PAYSANT]

Please,

I'm not an expert of MC/serviceGuard and I want to know if

When you have a cluster with two node, the filesystem is shared (without lockmanager).
In this case, the two nodes are be able to read and write on the same filesystem (like other Cluster (TRU64 V5.1)

Thank you in advance

[MARTINACHE]

Hi,

Without MC/Lock Manager, you can't activate a vg in read/write for 2 nodes at the same time.

The only way is NFS.

I think that it's possible in read only but I nerver did it.

Regards,

Patrice.

[melvyn burnard]

The answer is NO.
The VG's are activated on one node at a time in exclusive mode (vgchange -a e), this prevents the other node(s) from activating the VG in read/write mode.
What you ARE able to do is activate the VG in READ-ONLY mode.

Take a look at the Managing MC/ServiceGuard manual at:
http://www.docs.hp.com

[James R. Ferguson]

Hi:

MC/ServiceGuard and ServiceGurard OPS Edition are two separate products. ServiceGuard OPS was known as MC/LockManager until release A.11.08.

"OPS" = Oracle Parallel Servers. OPS maintains a single database image that is accessed by servers in parallel, thereby gaining added processing power without the need to administer separate databases.

A good overview of this product can be found here:

http://docs.hp.com/hpux/onlinedocs/B5158-90031/B5158-90031.html

With MC/ServiceGuard, access to a filesystem (or database) is controlled by a cluster lock (file). Only one node at a time can have control of the data.

For the MC/ServiceGuard product, see this:

http://docs.hp.com/hpux/onlinedocs/B6264-90002/B6264-90002.html

...JRF...