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тАО11-26-2004 10:30 AM
тАО11-26-2004 10:30 AM
Simultaneous access from two nodes with VMS 7.3-1 and EVA3000
Hi I want to know if is't possible to share an EVA virtual disk simultaneusly from two machines a DS25 and a ES45 alphaserver systems.
I mean like I do in a cluster configuration.
Somebody have and idea how to handle this task.
We have a system running vms in cluster and our idea is to do the same with the new devices (AS ds25, AS es45 and EVA3000)
thank you.
RP
I mean like I do in a cluster configuration.
Somebody have and idea how to handle this task.
We have a system running vms in cluster and our idea is to do the same with the new devices (AS ds25, AS es45 and EVA3000)
thank you.
RP
rperez
3 REPLIES 3
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тАО11-26-2004 06:59 PM
тАО11-26-2004 06:59 PM
Re: Simultaneous access from two nodes with VMS 7.3-1 and EVA3000
Ralph,
if the virtual disk is to be mounted read/write on at least one node - you MUST use VMScluster software on all nodes that mount it.
When a disk is mounted read/write, OpenVMS makes changes to the volume's structure. Those changes get communicated / are being synchronized with other node's activity by using the distributed lock manager in the VMScluster.
If you don't do that - you can be certain to get corrupted volumes. Some weeks ago I successfully demoed this to a customer when I accidently booted a node from the same system disk with cluster software turned off. (don't ask - it was a long day... and yes, I had a BACKUP - not much work was lost, phewww)
-----
I remember in the early days of dual-ported massbuss disks one of my employer had a 'semi-cluster' (that was VAX/VMS V3.x - VAXclusters were born in V4).
All systems had access to all data disks through multiport disk drives and multiport adapters. Each node had one disk mounted read/write and /NOCACHE - the other nodes mounted that volume readonly. It worked, well, 'most of the time'.
(Our system manager was a pretty clever woman, who wrote jobs so that we users could use this infrastructure to queue print or plot jobs on other nodes - the cluster-wide queue system wasn't born in VAX/VMS V3, either)
if the virtual disk is to be mounted read/write on at least one node - you MUST use VMScluster software on all nodes that mount it.
When a disk is mounted read/write, OpenVMS makes changes to the volume's structure. Those changes get communicated / are being synchronized with other node's activity by using the distributed lock manager in the VMScluster.
If you don't do that - you can be certain to get corrupted volumes. Some weeks ago I successfully demoed this to a customer when I accidently booted a node from the same system disk with cluster software turned off. (don't ask - it was a long day... and yes, I had a BACKUP - not much work was lost, phewww)
-----
I remember in the early days of dual-ported massbuss disks one of my employer had a 'semi-cluster' (that was VAX/VMS V3.x - VAXclusters were born in V4).
All systems had access to all data disks through multiport disk drives and multiport adapters. Each node had one disk mounted read/write and /NOCACHE - the other nodes mounted that volume readonly. It worked, well, 'most of the time'.
(Our system manager was a pretty clever woman, who wrote jobs so that we users could use this infrastructure to queue print or plot jobs on other nodes - the cluster-wide queue system wasn't born in VAX/VMS V3, either)
.
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тАО11-29-2004 08:47 AM
тАО11-29-2004 08:47 AM
Re: Simultaneous access from two nodes with VMS 7.3-1 and EVA3000
If you can't cluster the two systems, there are still some other alternatives available:
You could use DECnet remote file access through the File Access Listener (FAL) process.
You could use DECdfs software. This provides access to the files on a disk across a DECnet connection between nodes. The Software Product Description for DECdfs is at http://h18000.www1.hp.com/info/SP2878/SP2878PF.PDF
You could use DECnet remote file access through the File Access Listener (FAL) process.
You could use DECdfs software. This provides access to the files on a disk across a DECnet connection between nodes. The Software Product Description for DECdfs is at http://h18000.www1.hp.com/info/SP2878/SP2878PF.PDF
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тАО11-29-2004 06:07 PM
тАО11-29-2004 06:07 PM
Re: Simultaneous access from two nodes with VMS 7.3-1 and EVA3000
... or use NFS.
Wim
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