What! No 726 or 729 drives? Regards, Richard Schuh
> -----Original Message----- > From: The IBM z/VM Operating System > [mailto:ib...@listserv.uark.edu] On Behalf Of Tom Duerbusch > Sent: Monday, June 01, 2009 1:44 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: Z/VM and 3590 tape speed > > '80s.... > > We still have 3 IBM 3420 drives. > > If necessary, I should be able to read paper tape....... > > Tom Duerbusch > THD Consulting > > >>> "Schuh, Richard" <rsc...@visa.com> 6/1/2009 3:25 PM >>> > Bus and tag! I thought that you had progressed beyond the 1980's. > > Actually, we jut got rid of our last B/T devices a couple of > months ago. However, we referred to them as bug and tag - > they, not the cables or interface to the computer, were > problem devices. Their replacements are about the only ESCON > devices we have left. Maybe the vendor will upgrade to Ficon > in about 20 years. > > Regards, > Richard Schuh > > > > > -----Original Message----- > > From: The IBM z/VM Operating System > > [mailto:ib...@listserv.uark.edu] On Behalf Of Tom Duerbusch > > Sent: Monday, June 01, 2009 1:09 PM > > To: IBMVM@LISTSERV.UARK.EDU > > Subject: Re: Z/VM and 3590 tape speed > > > > Actually, it's the opposite. > > > > FICON is the only way to drive an IBM 3590 drive. > > ESCON is way, way too slow. > > > > I have ESCON attached B11 (9 MB/s transfer rate). I get > about 4 MB/s > > when controller hardware compression is used. I get about > 6 MB/s when > > compression is turned off. > > > > They are about twice as fast as my bus and tag 3480 drives. > > > > Tom Duerbusch > > THD Consulting > > > > >>> "Hughes, Jim" <jim.hug...@doit.nh.gov> 6/1/2009 1:55 PM >>> > > I am looking at table 3 on page 10 of the 3590 Introduction and > > Planning Guide. > > > > It mentions two things of interest: > > Device Data Rate(native) and Data Transfer Rate(maximum > > instantaneous). > > > > Device Data Rate for the E11 is 14 MB/Sec. > > Data Transfer Rate depends on the channel. > > > > I guess what I am reading says the tape will move around at > > 14 meg/sec no matter how fast I get the data to the device. > > FICON for tapes is a waste of time. > > > > When would FICON for tapes be a good idea? > > > > > > ____________________ > > Jim Hughes > > 603-271-5586 > > "It is fun to do the impossible." > > > > ==>-----Original Message----- > > ==>From: The IBM z/VM Operating System > > [mailto:ib...@listserv.uark.edu] On ==>Behalf Of Tom Duerbusch > > ==>Sent: Monday, June 01, 2009 2:46 PM > > ==>To: IBMVM@LISTSERV.UARK.EDU > > ==>Subject: Re: Z/VM and 3590 tape speed ==> ==>You're getting > > confused between tape drive speed and channel speed. > > ==> > > ==>The IBM 3590 E and H drives will read/write to the tape > at a rate > > of > > 14 > > ==>MBs. Multiple that rate by your compression rate, if you have > > ==>compression turned on. > > ==> > > ==>The FICON channel, can operate at 200 MB or 270 MBs (on a z/890). > > ==> > > ==>So if you had 2:1 compression, you would see a transfer > of 28 MBs. > > ==>Uncompressed it will be 14 MBs at best. > > ==> > > ==>And that is what you are seeing. > > ==> > > ==>These are data streaming drives. You have to feed the > beast. If > > your ==>source (disk) can't keep up with the tape drive and it's > > compression, you ==>will see much, much lower transfer numbers. > > ==> > > ==>Tom Duerbusch > > ==>THD Consulting > > ==> > > ==>>>> "Hughes, Jim" <jim.hug...@doit.nh.gov> 6/1/2009 1:08 PM >>> > > ==>We have Z/VM 5.4, with 4 3590's attached to the z890 using FICON > > Express ==>with the 2-Gbps feature. The tape controller is the A60. > > ==> > > ==> > > ==> > > ==>I am doing some tape speed tests and my results are not > very good. > > I ==>have a pipeline(look below) that writes 65,500 byte > blocks to the > > 3590. > > ==>I used the cms command TAPE MODESET ( NOCOMP/COMP to turn > > compression ==>off/on. > > ==> > > ==> > > ==> > > ==>I see around 14 MB/sec with compression off and 28 MB/sec with > > ==>compression on. > > ==> > > ==> > > ==> > > ==>The 3590 Planning manual says the 3590's should operate at > > 200MB/sec ==>when using FICON with the 2-Gbps feature. > > ==> > > ==> > > ==> > > ==>There maybe a problem with my pipeline or my expectations. > > ==> > > ==> > > ==> > > ==>Here is the pipeline. Any insight or suggestions are welcome. > > ==> > > ==> > > ==> > > ==>/* */ > > ==> > > ==>arg blkcnt . > > ==> > > ==>if blkcnt = "" then exit 99 > > ==> > > ==> > > ==> > > ==>numeric digits 12 > > ==> > > ==> > > ==> > > ==>"TAPE REW" > > ==> > > ==>"TAPE FSF" > > ==> > > ==>say time() > > ==> > > ==>x = time("E") > > ==> > > ==> > > ==> > > ==>"PIPE literal <------------> | >> tapetest 3590 a" > > ==> > > ==> > > ==> > > ==>"PIPE (endchar ?) ", > > ==> > > ==> "? xrange 00-ff |", /* 256 characters*/ > > ==> > > ==> " dup 256 |", > > ==> > > ==> " specs todclock 1 1-* n |", > > ==> > > ==> " join 256 |", /* 64k */ > > ==> > > ==> " dup * |", > > ==> > > ==> " specs todclock 1 1-* n |", > > ==> > > ==> " fblock 65500 00 |", > > ==> > > ==> " take " blkcnt " |", > > ==> > > ==> " cnt: count lines |", > > ==> > > ==> " tape 181 |", > > ==> > > ==> " specs 1-1 1 |", > > ==> > > ==> " join 4999 |", > > ==> > > ==> " specs todclock 1 |", > > ==> > > ==> " dateconv 1.8 todabs ISODATE timeout |", > > ==> > > ==> " specs recno 1 ", > > ==> > > ==> " substring fs . f 1 of word 2 nw ", > > ==> > > ==> " /5,000 Blocks Interval Check/ nw |", > > ==> > > ==> " console |", > > ==> > > ==> " >> tapetest 3590 a ", > > ==> > > ==> "? cnt: | var xblkcnt | specs / Blocks written =/ 1 w 1 nw |", > > ==> ==> " console" > > ==> > > ==> > > ==> > > ==>____________________ > > ==> > > ==>Jim Hughes > > ==> > > ==>603-271-5586 > > ==> > > ==>"It is fun to do the impossible." > > ==> > > ==> > > >
