IBM TotalStorage Enterprise Storage Server (ESS) Supported devices ESS Specialist

The ESS provides integrated caching and support for redundant arrays of independent disks (RAID) for the disk drive modules (DDMs). The DDMs are attached through a serial storage architecture (SSA) interface.

The ESS provides the following features:

When displaying a volume ID for ESS volumes, MDM displays a four-digit hexadecimal number in the format LLVV, where LL represents the LSS ID and VV represents the volume number. Any volume ID displayed in this format uniquely identifies a volume within a particular ESS.

Because of the ESS architecture, count-key data (CKD) volumes will therefore have volume ids in MDM that begin with a leading 0, whereas fixed block (FB) volumes will have ids beginning with 1. Another way of saying this is that CKD volumes belong to LSSs whose LSS ids begin with 0, whereas FB volumes belong to LSSs whose ids begin with 1.

You must correlate ESS volume ids as displayed in MDM to those displayed in the ESS Specialist and ESS CLI. Specialist generally displays the volume id as a three digit number that is identical to the last three digits of the MDM volume id. Specialist also generally appends additional information such the ESS serial number. MDM displays the serial number as part of the Device ID column.

To convert between MDM and Specialist formats, it is necessary to match the three-digit ESS volume id to the rightmost three digits of the MDM volume id. The leftmost MDM digit, which is always 0 or 1, should be used to differentiate between CKD and FB volumes.

Note:Note: In some cases the ESS Specialist displays the volume id in decimal rather than hexadecimal format. Correlating this with MDM will involve conversion between decimal and hexadecimal, as MDM uses hexadecimal format consistently for ESS volume ids.

inally, the ESS CLI displays volume ids in a long format that contains the same four-digit hexadecimal identifier used by MDM. Correlating this to MDM format is straightforward.

The following are examples of the same volume ID in each of the formats described above:

MDM
Volume ID  Device ID
---------  ---------
160A       2105.22331
ESS Specialist
Volume
------
60A-22331
ESS CLI
ESS.22331.160A.60a22331

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