Specifications

6-6 Sun StorEdge A1000 and A3x00/A3500FC Best Practices Guide • November 2002
■ 3f/00 targe operating conditions have changed
■ 3f/01 microcode has been changed
■ 3f/02 changed operating definition
■ 3f/03 inquiry data has changed
6.2 LUNs Not Seen
There are many possible causes, but the usual scenario is after reconfiguration of the
system:
■ After upgrade of RAID Manager 6, see bug 4118532.
■ After upgrade of Solaris: usually sd.conf is lost causing LUNs above 8 are no
longer seen. This is described in the Sun StorEdge RAID Manager 6.22 Release
Notes.
■ With RAID Manager 6.22, upgrading to Solaris 8 requires patch no. 108553. If you
were running with patch no. 108334, it should be removed first.
■ Removing or adding HBA’s can cause some controllers not to be seen as described
in bug 4295322.
■ The creation of a LUN on the A3500FC in a multi-host environment requires a few
extra steps to ensure that the device is properly built on both hosts. When a LUN
is created with RAID Manager 6, the devices for RAID Manager and Solaris are
properly configured. However, RAID Manager 6 does not configure the devices
on the other host. You must configure the devices on the other host manually. See
bug 4336091 for further details.
■ Problems with adding greater than 8 LUN support can cause some or all the
LUNs not to be seen. FIN I0589-1 describes the proper way to increase the
number of LUNs, especially using the glm HBA (PCI SCSI). Note the
add16lun.sh script delivered on the RAID Manager 6.1.1u1 CD-ROM was
wrong and should not be used. See FIN I0589-1.
■ Having VERITAS Volume Manager 2.x installed and DMP enabled can cause loss
of access to LUNs when a failover occurs. This configuration is not supported
because its puts data at risk.
■ A related issue is loss of communication with the module rdac. rdac cuts off
communication when it can’t access a LUN when there is a good path in
/dev/osa for it. This can happen if LUN creation is terminated prematurely,
either by operator intervention (kill -9 or control-C), by system panic or
power failure. rdac_disks usually corrects this problem or a reconfiguration
reboot.
■ Adding 17 LUNs to a module connected by the FC-PCI HBA, which only
supports 16 LUNs will cause this loss of communication too, see bug 4304898.