User`s guide

RA8000/ESA12000 HSG80 Solution Software V8.5 for Sun Solaris
Page 42 387372-005 AA–RFBPE–TE
• JBOD virtual disks—maximum of one member. JBOD’s may now be
expanded to two disks if concatenated sets are used.
• Striped virtual disks—maximum of 24 members
• Mirrored virtual disks—maximum of 6 members
• Striped mirrored virtual disks—maximum of 48 members
• Parity virtual disks—maximum of 14 members
Maximum Number of Active Connections Limited
The controller maintains a table of host port connections that can contain up to
64 named connections. Only 8 of those connections can be active (that is, “on
line”) at any time, however. Client shows only those connections that the
controller recognizes as “on line”.
Avoiding Problem Situations
In certain situations and under specific conditions, you may experience unusual
behavior with the software. This section presents information to help you avoid
such situations and to recover from them if they occur.
Enable Read-ahead Cache Before Enabling Write-back Cache
The controller requires that read-ahead cache mode is enabled before you can
enable write-back cache mode.
Incomplete Scans Cause Connection Loss
For proper display of subsystem status, Client performs a “scan” to collect
information about your storage subsystems. The program displays scan progress
screens while the process occurs. In some, rare situations, you may experience
incomplete scans or scans that appear to hang. In these cases, the likely cause is
that Client has lost its connection with the virtual disk it was using for
communication with your subsystem.
This problem may show up with either local SCSI or network connections.
To remedy this situation, you must first restart both of your controllers, followed
by restarting Client and Agent. If the system still does not operate properly, you
must reboot your host system. If your host is running Windows NT
®
, you must
ensure that the special device driver, HSZDISK.SYS, is installed and running
properly after it is booted.