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тАО04-21-2004 06:39 PM
тАО04-21-2004 06:39 PM
Re: general question on volume shadowing
excuse me for being a sceptical one ;-)
Have you had practical experience with this? If I recall correctly the capability to do a failover between MSCP served fibre paths and local paths isn't that old (V7.3?).
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тАО04-21-2004 06:46 PM
тАО04-21-2004 06:46 PM
Re: general question on volume shadowing
Yes, we started doing this when we moved form HSZ40's to HSG80's.
Our (I guess famed by now) cluster works this way since last juny.
Jan
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тАО04-21-2004 06:48 PM
тАО04-21-2004 06:48 PM
Re: general question on volume shadowing
Jan
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тАО04-21-2004 11:30 PM
тАО04-21-2004 11:30 PM
Re: general question on volume shadowing
It was the second cluster implementation for the software vendor and the customer had even less experience. The hardware was already ordered, but it was still an interesting project.
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тАО04-22-2004 04:45 AM
тАО04-22-2004 04:45 AM
Re: general question on volume shadowing
References:
7.2-2 New Features Manual: http://h71000.www7.hp.com/doc/722final/6650/6650pro.html
7.3-1 New Features Manual: http://h71000.www7.hp.com/doc/731FINAL/6657/6657PRO.HTML
"Multipath failover to an MSCP-served path for disks is implemented in SCSI and Fibre Channel configurations."
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тАО04-22-2004 07:46 AM
тАО04-22-2004 07:46 AM
Re: general question on volume shadowing
I know I read SOMETHING on this kind of stuff in the new shadowing manual that came with 7.2-2, but since we never used it, I never went deep into the details.
7.2-2 only introduced fiber channel storage, and I got them confused.
Sorry for the misinformation.
Jan
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тАО04-22-2004 09:21 AM
тАО04-22-2004 09:21 AM
Re: general question on volume shadowing
From the 7.2-2 release notes:
"Disaster-tolerant support for host-based volume shadowing in an OpenVMS Cluster configuration using shared Fibre Channel storage
- This support gives system managers greater control for managing failover.
- This feature is included in OpenVMS Version 7.3 and is also provided in Volume Shadowing update kits for OpenVMS Alpha Version 7.2-1H1 and for OpenVMS Alpha Version 7.2-1.
- The support provided in this release is identical to that provided in OpenVMS Version 7.3."
In retrospect, failover with these commands ended up being so complicated, messy, and error-prone that I ended up recommending that folks simply avoid connecting up their inter-site Fibre Channel link (thus forcing the use of only an MSCP-served path to remote disks, and obviating any failover issues) until they could get to 7.3-1.
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