AIX AND HANFS FUNCTIONALITY AND ENVIRONMENT
ITEM: RTA000025759
QUESTION:
Here are our questions:
1. Is there a facility in HA-NFS that will allow us to define our own
shell scripts to be executed after HA-NFS has done its recovery so
we can automate restarting our Database Manager, etc. on System B?
If there's nothing standard, how difficult do you think it would
be to write some shell scripts that check the environment (see if the
second LAN adapter is Enabled and A's Volume Group is varied on) and
then kick off our Database-related shell scripts?
2. If I only care that System B can take over for System A and not
vice-versa, do I really need a second LAN adapter in System A?
3. Can you see any other potential problems with using HA-NFS in this
environment? (support, etc.)
4. PMR 81X83090616 says there is a statement in the README file that all
SCSI adapters need to be at a specific rev level or HA-NFS will not
work. The 520s we want to use have been installed for quite a while
and the standard SCSI is probably not at the appropriate level. We
don't have the product so don't have access to the hanfs.README file
so can you give me that info, let me know if it applies to the
standard internal/external SCSI adapter in the 520 as well and
whether we can just place a service call to get the adapters upgraded
to the appropriate level?
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A: 1) There is no supported way to add a command to execute after
recovery on machine B. You could use a cron job to check
the status of the imported volume group with "lsvg vgname" and
also test the second network adapter status. Should not be
to hard.
2) HANFS is only supported on machines that have two network
adapters, so you would need two adapters on both machines.
3) As long as you set HANFS up correctly I do not see any problems
with using it without any NFS mounts.
4) You need SCSI Adapter part# 31G9722 in order to run HANFS. You
can see the part number of your SCSI adapter with "lscfg -v".
You can contact your CE about a service call and the EC regarding
the upgrade of your adapters.
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QUESTION:
Thanks for your very quick response and for the copy of the README.hanfs
file. I really appreciate your help.
Regarding the issue of LAN adapters. We only want the takeover to
go one way (System B takes System A's disks, but NOT vice versa. I
understand why we'd need the second LAN adapter for System B (to mimic
System A's IP address, etc.) but I don't understand why we'd need a
second LAN adapter for System A.
Can you help clarify this?
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A: The second LAN adapter is needed in system A and for initial boot.
Primary HANFS systems boot with the secondary network interface in an e
"up" state and the primary interface in a "detach" state.
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QUESTION:
One last question..for now. The DBMS (Sysbase) can use either the
UNIX(AIX) file system or raw i/o. Based on my understanding of HANFS
it shouldn't matter which approach they use since once the shared
volume group is accessed and online via the backup machine all
the logical volumes should be available to the backup system, right?
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A: You are correct it should not matter whether Sybase uses a raw
logical volume or a journaled logical volume. They are both just
logical volumes that are part of the imported volume group. You
should be able to re-synch the database and start the database
server again after the backup machine recovers and then be on line.
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This item was created from library item Q601194 BQXWR
Additional search words:
AIX ALTERNATE BQXWR ENVIRONMENT FUNCTIONALIT HANFS INDEX IX OCT92 OP
OZNEW QUESTION RISCOSO RISCSYSTEM SOFTWARE SYS
WWQA: ITEM: RTA000025759 ITEM: RTA000025759
Dated: 11/1996 Category: RISCOSO
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