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02-22-2004 02:58 PM
02-22-2004 02:58 PM
Solved! Go to Solution.
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02-22-2004 05:43 PM
02-22-2004 05:43 PM
Re: MSA1000 Question
you _can_ cascade another SANswitch 2/8 (with an ISL cable). I have put up a little ASCII drawing as an attachment, because the text area compresses multiple spaces.
You need to give that second switch a different domain:ID which can easily be done from the serial port.
What you cannot do is:
put a second controller into your MSA1000, connect another switch to it, put more servers on the second switch. The reason is because the MSA1000 controllers are in an active/standby role - one controller serves all (up to 32) LUNs and the other is in a waiting state to take over should the first one fail.
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02-22-2004 09:05 PM
02-22-2004 09:05 PM
Re: MSA1000 Question
I don't think my original question was 100% clear I couldn't be sure from the diagram if you are refering to the external HP StorageWorks SAN Switch 2/8-EL 322120-B21 ?
What I am wanting to know is if I have one MSA SAN Switch 2/8 (integrated) 288247-B21 internal to the MSA1000 with 7 servers with single HBA's (no redundancy) and i wish to expand the fabric and add additional hosts if I can add the second MSA SAN Switch 2/8 (integrated) and add more servers and if so do I need the redundant controller (because as you said they are active/passive) and do I need a cable to link them together or do they link together automatically using the port that is internal to the MSA1000??
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02-22-2004 10:03 PM
02-22-2004 10:03 PM
SolutionHonestly, I doubt that it is supported what you want to do - the QuickSpecs explicitly mention that you can connect to another external switch _or_ to another embedded 8-port switch in another MSA1000.
There is no internal connection between the internal switches - they have a straight connection to the controller backplanes. I'm not sure if you aware, but you can also put a simple I/O module (for straight connection to an external switch) or a small hub instead of the embedded switch into that place.
You need the second controller if you want to provide redundant paths to you logical disks. 'passive' does not mean that the second controller does no work at all: it has an up-to-date copy of the active controller's cache and it responds to LUN inquiries. Makes sense, as the Secure Path software must know that there is an alternate way to the disks.
You just cannot do I/Os through the controller unless a failover has taken place - then they change their roles.
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02-22-2004 10:15 PM
02-22-2004 10:15 PM
Re: MSA1000 Question
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02-22-2004 11:41 PM
02-22-2004 11:41 PM
Re: MSA1000 Question
I am not sure I am understanding you correctly, but:
you cannot connect 7 single-path servers to one controller and another 7 single-path servers to the other controller (as I have already written: your servers cannot do I/O through the passive controller - the MSA1000 does not work like the VA71x0). Also, if I recall correctly, you are not allowed to put both controllers in the same fabric.
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02-23-2004 01:57 AM
02-23-2004 01:57 AM
Re: MSA1000 Question
You can cascade the internal switch to another switch. If you need additional storage, you can add another MSA1000 and cascade the 2 internal switches together. If you don't need more storage, you can cascade to an external switch and connect the new server hosts to that, and they can then access the single MSA1000.
Thanks,
Doug

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02-23-2004 01:08 PM
02-23-2004 01:08 PM