B-2
SANnet II 200 SCSI Array Installation, Operation, and Service Manual • June 2005
Caution –
The I/O module is hot-serviceable, which means that you can replace it or
change its cables while the array is powered on but the SCSI host buses connected to
the array must be inactive.
B.1
Known Limitations Affecting SANnet II 200
SCSI JBOD Arrays
Limitations affecting the SANnet II 200 SCSI JBOD array are listed below:
■
Daisy-chaining is not supported.
■
SANscape software supports SANnet II 200 SCSI JBOD arrays. However, since
SANnet II 200 SCSI JBOD arrays do not have a RAID controller or RAID
controller firmware to manage the disks, this software support is necessarily limited.
Monitoring functionality that does not require a RAID controller or RAID controller
firmware works in the same way it does for RAID arrays. For details, see
“Monitoring with SANscape” on page B-9.
■
The SANscape CLI supports SANnet II 200 SCSI JBOD arrays. However, since
SANnet II 200 SCSI JBOD arrays do not have a RAID controller or RAID
controller firmware to manage the disks, this CLI support is necessarily limited. For
details, see “Monitoring with the SANscape CLI” on page B-12.
B.2
Connecting a SANnet II 200 JBOD Array
The SCSI specification states that the maximum bus length for Ultra3 SCSI is 12
meters (39.4 feet) for multidrop connections. The SANnet II 200 JBOD arrays use a
multidrop implementation. The ports on each channel are connected to the same
physical SCSI bus.
Taking into account the internal bus length of .5 meters (1.6 feet), and the internal
SCSI bus length of the host, the maximum SCSI bus length for each channel is 12
meters (39.4 feet) when connected to an LVD host adapter.
You must ensure that the length of all cables to any connected nodes, as well as the
internal bus length of .5 meters (1.6 feet) internal to the SANnet II 200 JBOD array
and the internal bus length of the host, is less than 12 meters (39.4 feet) in total. Also
include the jumper cable length of .3 meters (.98 feet) if the JBOD is being used in a
single-bus configuration.
The longest Ultra3 cable qualified by Dot Hill is 10 meters (32.8 feet) in length.
When connected to single-ended host adapters, the longest supported bus length per
channel is 1.5 meters (4.9 feet).
Summary of Contents for SANnet II 200
Page 32: ...3 4 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 64: ...4 32 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 74: ...5 10 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 106: ...7 22 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 130: ...B 20 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 146: ...E 10 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 154: ...F 8 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 160: ...G 6 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 178: ...I 10 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 180: ...J 2 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...
Page 186: ...6 SANnet II 200 SCSI Array Installation Operation and Service Manual June 2005...