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тАО04-24-2009 06:41 AM
тАО04-24-2009 06:41 AM
I have following doubts about storage controllers and will be thankful if any one there answers the same.
1. In an active passive controller,how passive controller takes over I/O requests when active controller fails? I would like to know the mechanism behind that.
2.How fabric switch identifies the initiator (Server node) and the target (storage node).
3. What is the difference between file level and block level access
Thanks in advance.
Raja
Solved! Go to Solution.
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тАО04-24-2009 06:55 AM
тАО04-24-2009 06:55 AM
Solution2. Fabric Switches do not identify SAN based devices as "targets" and "initiators". Generally speaking... hosts nodes are considered "initiators" and storage devices are considered "targets". The terms are an industry standard designation and have nothing to do with the switch.
3. I am not exactly sure how to convey the difference in words. I am sure there is good way and that someone will probably post it. ;o)
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
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NPP3 (Nutanix Platform Professional)
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тАО04-24-2009 07:11 AM
тАО04-24-2009 07:11 AM
Re: Storage Array Queries
Ans 2. Fabric communicates using wwn numbers from Server HBA Cards and Storage Ports. Go through the SAN.
Go through this link all you questions should be clarified..
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00403562/c00403562.pdf
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тАО04-24-2009 11:24 AM
тАО04-24-2009 11:24 AM
Re: Storage Array Queries
True for an MSA, but on an active/passive EVA both controllers can process I/Os (for different virtual disks).
There is no unique definition of what is an active/passive or an active/active array. For example, an MSA2012 or a Dell/EqualLogic PS-Series is called an active/active array, although the second controller does not present any SCSI LUNs for volumes of the first controller.
But they are called A/A, because it is possible to push down I/Os all existing paths - some that is not possible on an A/P MSA1000 series or EVA-3000/-5000.
In A/P and A/A arrays, both controllers communicate to each other via an interlink. If one controllers assumes that its partner as failed, it takes over management responsibility of the partner's ressources (logical/virtual disks, volumes, storage sets, LUNs - whatever terminology that vendor has invented ;-)
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тАО04-25-2009 05:25 AM
тАО04-25-2009 05:25 AM
Re: Storage Array Queries
Can you tell me what is the difference between file level and block level access.
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тАО04-25-2009 06:40 AM
тАО04-25-2009 06:40 AM
Re: Storage Array Queries
http://searchstorage.techtarget.com/expert/KnowledgebaseAnswer/0,289625,sid5_cid607313,00.html
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
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тАО04-27-2009 07:58 AM
тАО04-27-2009 07:58 AM
Re: Storage Array Queries
File Level - Typically known are NAS. This is where storage is presented to the host as a directory or drive letter and utilize such protocols as CIFS and NFS. Host was no control of the "backend" of the files (the layout). I/O is performed via the LAN (TCP/IP).
Block Level - Storage is presented ot the host as blocks. The host OS then utilizes it volume manangement software to utilize this. This allows flexibility and tuning to maximim performance. I/O is proceessed via an HBA.
Cheers,
Curt
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тАО04-28-2009 01:25 AM
тАО04-28-2009 01:25 AM