Specifications

4. Contact your IBM service support representative to install and configure the IBM
ESS.
Attachment considerations
This section lists the attachment considerations for an iSeries host system.
1. The ESS creates LUN serial numbers that are eight characters in the format
0LLLLNNN, where:
LLLL A unique volume number assigned by the ESS when the LUN is
created.
NNN low-order three characters of the ESS unit serial number or unique
three-character value which an IBM SSR can enter using an ESS
service panel menu option
Contact your IBM SSR to perform the following tasks:
a. From the Service Menu, select the Configuration Options Menu option.
b. Select Change / Show Control Switches.
c. Highlight AS/400 LUN Serial Number Suffix.
d. Select Control Switch Value, and press F4 to list the available values.
The default value is the last three digits of the serial number for the ESS.
Notes:
1. You cannot specify a 4.190 GB LUN size for the SCSI fibre-channel protocol
(FCP) attachment.
2. You can specify1-32LUNs for each attachment to an iSeries fibre-channel
adapter.
3. Fibre-channel attached LUNS are identified as the ESS device type on the
iSeries host system.
4. You can place iSeries volumes in the ESS storage arrays according to the
selected host system attachment type.
For a fibre-channel attachment, you must place the volumes in ESS RAID-5
storage arrays that have capacity available. You can spread the volumes across
arrays that are attached to multiple device adapters.
5. You cannot place iSeries volumes in an ESS non-RAID storage array.
6. You cannot share an iSeries volume with more than one fibre-channel system
attachment.
7. The attachment type and the available ESS storage array capacity determine
the number of volumes that you can create.
You can create1-32LUNs for a fibre-channel attachment.
Figure 31 on page 50 shows an example of the display for the hardware service
manager (HSM) auxiliary storage hardware resource detail for the 2766 adapter
card.
Chapter 4. Attaching to an IBM AS/400 or iSeries host 49
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