I want to add another SCSI bus to our heavily overloaded 2100. It's
currently fully stocked with (narrow) disks in the main cabinet and
three more shelves or disks in an HSZ40 connected to the 2100 via a
Fast/Wide KSPSA. It looks to me as though the mail disk (sitting on
a wide shelf in the HSZ40) and the spool disk (a narrow disk driven
by the internal SCSI adapter in the main cabinet) are bottlenecks.
I want to get two new (wide 10K RPM) disks and put them in an external
box connected to a new SCSI adapter. Now for the question part. Since
the 2100 is now obsolete, the "supported hardware" list hasn't been
kept up to date and the latest SCSI adapter that it supports appears
to be the KZPSA, Fast/Wide/Differential (we already have one
connected to the HSZ40). What I'd like to know is whether the KZPDA-AA
(Fast/Wide/Single-Ended) or KZPBA-CA (Ultra/Wide/Single-Ended) SCSI
adapters will work properly in the 2100? (In fact, what I'd *really*
like to do is simply put in a Mylex/BusLogic BT958 Ultra/Wide adapter
but I guess DUX doesn't have a driver for it.) If there are any other
possibilities (e.g. widely available Fast/Wide or Ultra/Wide SCSI
adapters that DUX *does* have a driver for) then I'd like to hear of
those too.
While I'm asking questions: does anyone know if there's any way of
querying disk subsystem statistics in more details than plain iostat?
iostat doesn't even give transfers-per-second figures (for our RZ28
and RZ29 disks in the HSZ40, on SWXCR controllers or on the internal
bus) let alone things like tagged queue depths, break-down of disk
reads/writes by size and such like.
We're running Digital UNIX 4.0D Patch Kit 3 (BL11?) plus security
patches. I'll summarise any responses to the list, as usual.
Thanks,
--Malcolm
--
Malcolm Beattie <mbeattie_at_sable.ox.ac.uk>
Unix Systems Programmer
Oxford University Computing Services
Received on Tue May 18 1999 - 15:55:55 NZST