Interview questions for emc clariion google docs

Explain Clariion architecture?

The EMC Training CLARiiON storage system is based on a modular architecture. The first building block of the architecture is the Disk Processor Enclosure, or DPE. The DPE houses the storage Processor (s) and the first Fiber Channel Arbitrated Loop (FC-AL) disks. Disk Array Enclosures (DAEs) are interconnected using Link Control Cards (LCCs). When more capacity is required, additional disk array enclosures (DAE or DAE2) containing disk modules can be added. LCC or Link Control Cards are used to connect shelves of disks. In addition, the LCC monitors the FRUs within the shelf and reports status information to the storage processor. The LCC contains bypass circuitry which allows the operation of the loop in the event of port failure.

Newer CLARiiON arrays have two processors per Storage Processor, and do not use a DPE. Instead, it uses an SPE or Storage Processor Enclosure. The SPE does not contain any disk modules, so it must have at least one DAE2 and a maximum of 16 DAE2s. CLARiiON Architecture is based on intelligent Storage Processors that manage physical drives on the back end and service host requests on the front end, or Fiber Channel or iSCSI protocols. CLARiiON Messaging Interface (CMI). Both the front-end connection and the back-end connection to the physical storage is 2Gb Fiber channel.

What are di erent types of Clariion models?

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CX-200,300,300i, 400,500,500i, 600 and 700

CX3-10, 20, 40 and CX3-80

CX4-120, 240, 480 and CX4-960

AX Series FC Series

What are the significant features of Access Logix?

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LUN masking.

Presents a virtual storage system.

Maps CLARiiON LUNs (FLARE LUNs) to host LUNs. Manages the Access Control List.

Initiator Registration Records Manages - Access Logix database entries.

Why Access Logix has to be enabled?

If Access Logix is not enabled, all LUNs are presented to all storage systems.

Any host that connects to the storage system will then have access to all of the LUNs on that storage system. Where multiple hosts attach to the storage system, this will cause problems. Windows LUNs, Access Logix solves these problems by performing LUNs masks present those LUNs only to the server (s) which are authorized to see them. In e ect, it presents a virtual storage system to each host - the host sees the equivalent of a storage system dedicated to it, with only its own LUNs visible to it.

Another task which Access Logix performs is the mapping of CLARiiON LUNs, often called FLARE LUNs or FLUs, to host LUNs. It will be determined which physical addresses, in this case the device numbers, will be used for its LUNs. Note that this feature is configurable by the user through the CLI and the GUI. Access to LUNs is controlled by information stored in the Access Logix database, which is resident in a reserved area of CLARiiON disk - the PSM LUN. The Access Logix software hosts this database.When host agents in the CLARiiON environment start up, they are connected to. This initiator is stored in the Access Logix database.

What is SP Collects?

Spcollect is a Storage Processor based on the Storage Processor and bundles this information for investigation by engineering.

navicli -h {ip} spcollect {eng mode password} - invoke the spcollects

navicli -h {ip} managefiles -list - to monitor the progress

navicli -h {ip} managefiles -retrieve -file {filename} - to transfer spcollect file to management host.

The managefiles command to the Navisphere CLI directory where the command was invoked.

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