mikes@NCoast.ORG (Mike Squires) (11/17/89)
In article <935@puck.UUCP> asp@puck.UUCP (Andy Puchrik) writes: > > Does the Adaptec SCSI controller support both disks and tapes? >How many devices can it support? Ideally, I'd like to have two disks >and one tape driver. What kind of performance do you get with an Archive >Viper with a SCSI interface? > I am using an Adaptec 1540A controller in a Tandy 4000LX with a CDC 340MB primary and a Micropolis 660MB secondary HD, plus a Cipher 150II SCSI tape drive. Disk throughput running "tar" in multiuser mode using the "monitor" program posted to this group some time ago shows peak rates around 120KB/sec to the Micropolis drive. The tape drive is fast enough. This installation uses vanilla SCO XENIX 2.3.2 GT with 4MB DRAM on the 4000LX. Michael L. Squires uucp: {necntc,cwjcc,hoptoad}!ncoast!peng!sir-alan!mikes 752 Chestnut Street ..!{pitt,uunet!convex,uunet}!sir-alan!mikes Meadville, PA 16335 BITNET: mikes%sir-alan@pitt.UUCP (VAX) Voice: 814 337 5528 MIKES AT SIR-ALAN!PITT.UUCP (IBM) Data: 814 337 0348 Internet: sir-alan!mikes@uunet.uu.net login of "ubbs" for BBS sir-alan!mikes@vax.cs.pittsburgh.edu
fyl@ssc.UUCP (Phil Hughes) (11/20/89)
Ok, now, how about 2 disk drives, 1 cartridge tape and 1 9-track tape.
We still have a 286 in the corner with a 9-track drive on it to write
9-track tapes. I would love to get a Pertec to SCSI adapter and a driver
so I could put this sucker on the 386 system.
--
Phil Hughes, SSC, Inc. P.O. Box 55549, Seattle, WA 98155 (206)FOR-UNIX
amc-gw!ssc!fyl or uunet!pilchuck!ssc!fyl or attmail!ssc!fyljim@bahamut.fsc.com (James O'Connor) (11/22/89)
In article <1989Nov17.044859.7911@NCoast.ORG>, mikes@NCoast.ORG (Mike Squires) writes: > In article <935@puck.UUCP> asp@puck.UUCP (Andy Puchrik) writes: > > Does the Adaptec SCSI controller support both disks and tapes? > >How many devices can it support? Ideally, I'd like to have two disks > >and one tape driver. What kind of performance do you get with an Archive > >Viper with a SCSI interface? > > I am using an Adaptec 1540A controller in a Tandy 4000LX with a CDC 340MB > primary and a Micropolis 660MB secondary HD, plus a Cipher 150II SCSI tape > drive. Disk throughput running "tar" in multiuser mode using the "monitor" We're also using SCSI here under SCO Xenix 2.3GT. Here's what we look like: Host Adapter 1: Adaptec 1540 (as sold by Tandy) CDC Wren V 190MB Half-Height drive Quantum Q280 80MB Half-Height drive (as sold by Tandy) Host Adapter 2: Adaptec 1540A (as sold by Tandy) Syquest SQ555 44MB removeable hard drive Archive Viper 150MB Tape drive We went to the split host adapter configuration because of an apparent conflict on the SCSI bus between the CDC and Syquest drive. They both work fine, and perform great, on separate busses, but put them on the same bus, and lock ups start occuring at a rapid pace. This may be due to my particular drives, and is not a blanket statement about all CDC or Syquest drives. The tape performance is great. It streams when using tar (or ctar) about 70% of the time, and almost always streams when it's just skipping over files that it's not writing to the disk (i.e. doing "tar xvf /dev/rct0 file" where "file" is near the end of the tape will be fairly painless cause the tape drive will stream 97% of the time until it finds "file"). We haven't had any trouble with the multi-host-adapter set up, and we have even used a normal WD controller in the same system for a while without trouble. The Adaptec 1540A has an external connector on it, so I'm looking forward to being able to add another drive or two when I need it. ------------- James B. O'Connor Work: jim@tiamat.fsc.com Filtration Sciences -- Play: jim@bahamut.fsc.com A division of Ahlstrom UUCP: uunet!tiamat!jim