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тАО06-20-2003 12:04 PM
тАО06-20-2003 12:04 PM
Vax CI
Is the VAX CI considered a SAN (Storage Area Network) as we now it today? If not can you elaborate the differences?
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тАО06-20-2003 01:01 PM
тАО06-20-2003 01:01 PM
Re: Vax CI
The VAX CI provides access to storage, but only to members of the cluster, whereas, a SAN can offer access to any member of the network.
Depending on the hardware, SAN throughput may be faster.
Generally, all data in the VAX CI can be shared with all nodes of the cluster. The distributed lock manager handles conflicts and prevents corruption. In a SAN, generally data is not shared and is usually accessed by only one system at a time.
HTH
Marty
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тАО06-21-2003 08:56 AM
тАО06-21-2003 08:56 AM
Re: Vax CI
If memory servers me correctly, The star coupler was nothing but a hughe tranformer interconnect. The HSC controllers I worked with back then were the HSC 70 (I think) and they had 4 RA60's attached along with a mirror in which they called it shadowing back then.
Is there any detail documentation that explains the Fiber Channel protocols to the CI. It seems to me unlike in a true SAN today you have all the FC layers from 0 to 4. Fiber Channel Interfaces came out much later after I left the Vax world to the Unix side.
In my opinion, DEC should never sold out. The Vax systems were way ahead of it's time.
BTW, did get a notification that anyone replied to me question. Please be sure to email me at pbbruce@mindspring.com
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тАО06-21-2003 01:55 PM
тАО06-21-2003 01:55 PM
Re: Vax CI
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тАО06-23-2003 06:53 AM
тАО06-23-2003 06:53 AM
Re: Vax CI
A CI Cluster or Hardware cluster can server disks to any and all nodes connected to the Star Coupler, no matter they are in a VMS cluster or not. Pretty much like a SAN.
Like a SAN, we can have redundant Path of each of the disks/controllers/Tape drives etc.
Unlike a SAN, disk resource level zoning cannot be implimented on the Star Coupler (like one can do on a SAN Switch/Director)
Regards,
Vinit Adya
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тАО07-30-2003 02:40 PM
тАО07-30-2003 02:40 PM
Re: Vax CI
There are at least hundreds of sites which have used Host-Based Volume Shadowing to replicate (shadow, mirror) disks between clustered VAX systems at two sites.
Such a VAXcluster setup saved Credit Lyonnais from losing their data during a fire in Paris in 1996. More recently, Commerzbank survived the 9/11 attacks thanks to a VMS disaster-tolerant cluster based on Alphas (see http://h71000.www7.hp.com/openvms/brochures/commerzbank/commerzbank.pdf), although I know of others who also survived who used VAX systems in their DT clusters.
I managed a disaster-tolerant VAXcluster with sites 130 miles apart at E*Trade a few years back.
See my DECUS presentations on "Using OpenVMS Clusters for Disaster Tolerance" at http://www2.openvms.org/kparris/ and http://www.geocities.com/keithparris/ for more information.