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SAN redundancy question.

Hi guys, we just got a new SAN and my boss has asked me to set it up. BUT issue is, he has asked me to configure two separate arrays of 10TB each that should replicate to each other to provide more redundancy… now am I stupid in thinking that this is pointless on a single SAN because it’s all one device anyway (as in two SANs replicating makes perfect sense) or is this the way to do it. What are the chances of the array becoming corrupted vs. the extra storage space… or is it something else entirely.

Thanks
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liminal
Asked:
liminal
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2 Solutions
 
IanThCommented:
what san is it netapp does that the second head is a snapshot of the primary head. the san world is basically going to go for a virtual san inside a physical san in the future thats basically whart netapp does  
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Handy HolderSaggar makers bottom knockerCommented:
Pretty much a waste of space if you ask me, extra redundancy is provided by replicating to a second SAN node, not to itself. Most top-end and mid-range SAN boxes offer synchronous and asynchronous replication, but generally you can't point them to themselves as it's pointless.
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arnoldCommented:
Depending on what the purpose/use for the space, it might be that you were asked to create a RAID 10 LUN of 10 TB?

Redundancy is based on the least redundant component.

In your case  as you and others pointed out the device is the limiter.
2 or more power supplies eliminates the power issues, unless they are both plugged into the same source handled by a single breaker.
2 Processing unints gives redundancy provided your system has two lines coming it.
multiple disks RAID group provide you disk level redundancy to a point. RAID 1-5 provides tolerance for a single disk failure per LUN /disk group RAID 0 has no tolerance for disk failure.

Will wait to see which SAN you have Netapp, EMC, Hitachi/IBM, Oracle/SUN, HP. Dell equalogic?
FiberChannel or iSCSI?
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rapcoCommented:
20 TB box, that's big.

No benefit, try better get RAID 6 and assing two Hot spares.

I'm curious about the size of thoseHDDs.
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liminalAuthor Commented:
its a HP SAN, the drives are 2TB SAS drives... pricey :)

yeah thats what i wanted too, RAID 6 with one hot spare... but there seems to be no option for it. it automatically creates two arrays. you can make the arrays either RAID 5 or RAID 6... but you cant seem to create one large array and you cant seem to define a hot spare... strange  
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Gerald ConnollyCommented:
What model of HP SAN?
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IanThCommented:
you could make your own with open filer and then create any raid array
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Handy HolderSaggar makers bottom knockerCommented:
Wrong question? They've already got a SAN, just not telling us what it is for some reason.
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liminalAuthor Commented:
no no sorry, its a HP StorageWorks P4500 G2

I just wasn't in the coms room when you asked first time :)

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Paul SolovyovskySenior IT AdvisorCommented:
The Lefthand (P4500) can be configured in RAID1 and RAID5 (3 nodes or more) sot that it's replicated just like raid controllers only across nodes.
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Handy HolderSaggar makers bottom knockerCommented:
The starter SANs come as two nodes anyway, that could explain why they can't make one big array but only two smaller ones (although they can stripe them across two boxes using network RAID 0 if I remember properly).
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QlemoC++ DeveloperCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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