EMC AX100 Release Notes - Page 27

Technical notes Disk module insertion and removal When inserting or removing more than one disk module from a storage system, you must pause between each removal or insertion to allow the storage system to recover. Before inserting or removing the next disk module you should make sure that: Š A newly inserted disk module's amber light is off and its blue light has returned to a normal state: on or blinking due to I/O in progress. Š On a disk module removal, the blue lights for the other disk modules return to a normal state: on or blinking due to I/O in progress. Š The storage system appears to have resumed normal operation. Database disk module replacement You should replace disk module 0, 1 or 2 only when the storage system is fully operational. The disk modules in these slots are FLARE OE database disk modules. Each database disk module contains an image of the storage-system configuration and current operating status. FLARE OE software ensures that the newly inserted disk module has the correct database information copied to it when it is installed while the storage system is running. If you insert a disk module into one of these slots when the storage system is powered off, the correct FLARE OE database information is not written to the replaced database disk module. As a result, storage-system configuration problems may occur when the storage system is powered up or if another database disk module fails. If you install a FLARE OE database disk module and you find that existing virtual disks are not enabled, contact your EMC customer service representative. Software image disk module replacement The FLARE software image is stored on disk modules 0 and 2 for the AX100SC and AX100SCi and disk modules 0, 1, 2 and 3 for the AX100 and AX100i. Disk modules 0 and 2 mirror the software for the AX100SC and AX100SCi SP and for the AX100 and AX100i SP A. Disk modules 1 and 3 mirror the software for the AX100 and AX100i SP B. You should never remove and/or replace both disk modules in one of the mirrors at the same time. If you do, no software exists to support that SP, and the SP becomes nonfunctional. Navisphere Integrator management of non-AX100 CLARiiON storage systems on the same subnet as AX100-series storage systems If you install an AX100-series storage system on the same network as other CLARiiON storage systems that you manage with Navisphere Integrator, you must upgrade to Navisphere Integrator version 6.16 or higher. EMC AX100-Series Integrated Management Software Release Notes 27