Sparcstorage Multipack Units - Sun Microsystems Ultra Enterprise 450 Produkthinweise

SPARCstorage MultiPack Units

A compatibility issue exists between the Ultra Enterprise 450 server's embedded or
expansion PCI SCSI host bus adapters (HBAs) and some older Fast/Wide SCSI
SPARCstorage™ MultiPack (SMP) units that may contain UltraSCSI (Fast-20)
capable drives. The HBAs available on Ultra Enterprise 450 servers default to use
UltraSCSI operation when UltraSCSI devices are present. However, some
SPARCstorage MultiPack units (both 6- and 12-drive versions) do not support
UltraSCSI operation. Attempting to use such a configuration can lead to reduced
SCSI bus performance and potential system panic.
Workaround: Prior to using this configuration, disable the UltraSCSI mode for each
controller instance to which a SMP is attached. Refer to the pci(4), glm(7D), and
isp(7D) man pages for details.
Note – An alternative workaround method involving a global SCSI option change
through /etc/system would result in loss of UltraSCSI mode on internal system
disk backplanes.
This issue does not exist with six-drive SPARCstorage MultiPack 2 systems, which
are UltraSCSI capable.
Ultra Enterprise 450 Server Product Notes 1-7