| Title: | Ask the Storage Architecture Group |
| Notice: | Check out our web page at http://www-starch.shr.dec.com |
| Moderator: | SSAG::TERZA N |
| Created: | Wed Oct 15 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 6756 |
| Total number of notes: | 25276 |
A customer has concerns about a proposed DSSI QUAD-HOST.
He has two existing VAX4705A that are dual hosted.
He plans on purchasing two VAX4600A and some HSD10/BA356.
The concern is over the DSSI performance. Should he purchase
a KFQSA for each of the four systems and place two HSD10/BA356
off that DSSI bus or take the two additional HSD10/BA356
and spread them out on two of the existing internal buses.
Example I:
VAX4600A VAX4705A VAX4600A VAX4705A
Internal Internal
Bus 0 HSD10-J t HSD10-J t
Bus 1 t +-----------+ +-------HSD10--HSD10--HSD10---+ +--------+ t
BA356 BA356 BA356
KFDDB KFDDB KFDDB KFDDB
Bus 2 t +-----------+ +-------HSD10--HSD10--HSD10---+ +--------+ t
BA356 BA356 BA356
Bus 3 t +-----------+ +-------HSD10--HSD10----------+ +--------+ t
BA356 BA356
EXAMPLE II:
VAX4600A VAX4705A VAX4600A VAX4705A
Internal Internal
Bus 0 HSD10-J t HSD10-J t
Bus 1 t +-----------+ +-------HSD10--HSD10----------+ +--------+ t
BA356 BA356
Bus 2 t +-----------+ +-------HSD10--HSD10----------+ +--------+ t
BA356 BA356
KFDDB KFDDB KFDDB KFDDB
Bus 3 t +-----------+ +-------HSD10--HSD10----------+ +--------+ t
BA356 BA356
KFQSA KFQSA KFQSA KFQSA
Bus 4 t +-----------+ +-------HSD10--HSD10----------+ +--------+ t
BA356 BA356
Ed Burkhalter
CSC Atlanta
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 6370.1 | not supported | PROXY::J_EVANS | Mon Feb 03 1997 11:18 | 7 | |
Ed,
The first concern is support. The VAX4000-7xx has only been qual'd as a
tri-host. Quad-host DSSI isn't supported in this configuration. Page
3.46 of the Nov '96 SOC mentions three system DSSI cluster.
jim
| |||||