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From: abstine@sun.soe.clarkson.edu (Arthur Stine)
Newsgroups: comp.sys.dec,comp.arch
Subject: Re: DECstation 3100 info.
Message-ID: <2051@sun.soe.clarkson.edu>
Date: 24 Jan 89 14:46:11 GMT
References: <420@laic.UUCP>
Sender: abstine@sun.soe.clarkson.edu
Lines: 48

From article <420@laic.UUCP>, by darin@nova.laic.uucp (Darin Johnson):
> In article <986@isieng.UUCP> seenu@isieng.UUCP (Seenu Banda) writes:
>>In article <414@laic.UUCP>, darin@nova.laic.uucp (Darin Johnson) writes:
>>
>>> have one for the 3100.  They also include a small disk hidden in the box
>>                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>> that can be used to boot the machine, with NFS used for everything else
>>
>>This is really interesting. This is the first time I heard about a hidden
>>disk in the 3100. Does anybody know more about this disk? How small (or
>>big) is it? 10MB? 
> 
The new 3100's have various SCSI disk options. The small (3.5") internal
disk options are: RZ22 52MB paging disk, RZ23 104MB primary storage disk, and
the RZ55 332MB (5.25") disk. This is in addition to the RX23 1.44MB floppies,
the new RRD40 optical drive, and the TK50Z tape. The RZ22 is intended as
a page/swap area only and not for primary storage.

As far as performance:

Drive		RZ22		RD53		RZ23	RD54		RZ55
------		-----		----		----    ---- 		----
Capacity	52M		71M		104M	159M		332M
Ave. Access	33		38		33	38		24
Xfer rate MB/s	1.25		.625		1.25	.625		1.25
form factor	3.5"		5.25"		3.5"	5.25"		5.25"
full/half hgt   half		full		half	full		full 
price		++		$4,274		$2,400	$4,590		++

++ the RZ22 and RZ55 are only available imbedded in the systems and not as
add-on options.

RZ55 is a DECstation 3100 has a transfer rate of 4MB/s using Sync SCSI.

RZ22 is available on VAXstation-3100 only, RZ23 is available on VAXstation
3100 as a primary storage disk and on the DECstation-3100 as a paging disk.
The RZ55 fits into an expansion box on the two 3100 stations at a price
of $6500


Now, since both the DECstation 3100 and VAXstation 3100 use standard SCSI,
your best bet is to probably get 3rd party fast SCSI drives (fast meaning
less than 20ms access times). Not only are they faster, but they are probably
cheaper too.

Art Stine
Sr Network Engineer
Clarkson U