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тАО10-04-2007 05:39 AM
тАО10-04-2007 05:39 AM
OpenVMS 7.3-2 on Alphaserver DS10
Main objective is to replicate data from one datacenter to another located 2800 cable feet apart without using VMS clustering.
Standalone node at site 1 connected via a short-wave SFP to FC switch with attached MSA1000. FC switch at site 1 connected via a Long-Wave ISL (inter-site link dedicated fiber) to another FC switch at site 2 which has also has an attached MSA1000.
Can the standalone node at site 1 see the drives at site 2 and use volume shadowing to replicate the data? Again, this is a standalone system at site one with no current system at site 2.
Any ideas or opinions would be helpful.
Solved! Go to Solution.
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тАО10-04-2007 06:08 AM
тАО10-04-2007 06:08 AM
Re: Data replication on MSA1000 w/volume shadowing... Possible?
Bill
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тАО10-04-2007 06:11 AM
тАО10-04-2007 06:11 AM
Re: Data replication on MSA1000 w/volume shadowing... Possible?
Verne
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тАО10-04-2007 06:14 AM
тАО10-04-2007 06:14 AM
Re: Data replication on MSA1000 w/volume shadowing... Possible?
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тАО10-04-2007 06:48 AM
тАО10-04-2007 06:48 AM
SolutionDrive level (block-level) replication can also work -- having had repeated bad experiences with this approach over the last twenty-some years, drive-level replication hasn't tended to be my favored solution.
In this case, the storage hardware guys do have good gear, and a write-only controller-level replicated remote storage case is the easiest case. Where these non-cluster cluster schemes tend to tip over with ugliness is usually with shared write access. That's a very hard problem for hardware to deal with.
Host-based volume shadowing (HBVS) also works here.
Getting the replicated server going (and a network link for command, control and cluster communications) would be high on my priority list here. Having that server makes for far easier fail-over, can actively assist with many of the processing tasks, and the secondary server -- if no other task is selected -- can also verify the integrity of the replicated data, and can perform off-line archival processing. (Replicated data isn't a viable defense against application-level and volume-structure-level errors, nor against PBKAC-class ("user") errors.)
But yes, what you have should work -- you have to FC storage controllers here, HBVS can shadow across two FC SAN controllers, and I'd not expect a kilometer of fibre cabling to have any noticeable affect on I/O performance.
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тАО10-04-2007 07:35 AM
тАО10-04-2007 07:35 AM
Re: Data replication on MSA1000 w/volume shadowing... Possible?
see this mirror of the foc
http://pi-net.dyndns.org/docs/rdb/hotstandby/guide/title.htm
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тАО10-05-2007 12:53 AM
тАО10-05-2007 12:53 AM