Greg A. Woods wrote...
> [ On Friday, April 2, 1999 at 23:23:57 (-0700), Kenneth D. Merry wrote: ]
> > Subject: Re: kern/7300: 'chio ielem' does not work well
> >
> > sa0 at ahc0 bus 0 target 4 lun 0
> > sa0: <EXABYTE EXB-8500-85Qanx0 0415> Removable Sequential Access SCSI-2 device 
> > sa0: 4.032MB/s transfers (4.032MHz, offset 11)
> > ch0 at ahc0 bus 0 target 3 lun 0
> > ch0: <EXABYTE EXB-10i 2.6> Removable Changer SCSI-2 device 
> > ch0: 3.300MB/s transfers
> > ch0: 10 slots, 1 drive, 1 picker, 0 portals
> > 
> > And it takes about 88 seconds to do a 'chio ielem':
> > 
> > # /usr/bin/time chio ielem
> >        87.91 real         0.00 user         0.00 sys
> 
> Indeed the EXB-10e (which may actually be a 10h according to some
> release notes I read the other day) takes only about 80 seconds do to an
> element initialize once it's already done one.  However from its initial
> state, either after power up, or after a bus reset, it seems to take at
> least 120 seconds.

Well, mine takes about the same amount of time when it is and isn't
initialized:

# chio status
picker 0: <EXCEPT>
slot 0: <ACCESS,EXCEPT>
slot 1: <ACCESS,EXCEPT>
slot 2: <ACCESS,EXCEPT>
slot 3: <ACCESS,EXCEPT>
slot 4: <ACCESS,EXCEPT>
slot 5: <ACCESS,EXCEPT>
slot 6: <ACCESS,EXCEPT>
slot 7: <ACCESS,EXCEPT>
slot 8: <ACCESS,EXCEPT>
slot 9: <ACCESS,EXCEPT>
drive 0: <ACCESS,EXCEPT>
# /usr/bin/time chio ielem
       87.90 real         0.00 user         0.00 sys
# chio status
picker 0: 
slot 0: <ACCESS>
slot 1: <ACCESS>
slot 2: <ACCESS>
slot 3: <ACCESS>
slot 4: <ACCESS,FULL>
slot 5: <ACCESS,FULL>
slot 6: <ACCESS>
slot 7: <ACCESS,FULL>
slot 8: <ACCESS>
slot 9: <ACCESS>
drive 0: <ACCESS>
# /usr/bin/time chio ielem
       88.03 real         0.00 user         0.00 sys

And, for another data point, I tried out an Ampex DST-712 today:

ch0 at ahc0 bus 0 target 4 lun 0
ch0: <AMPEX DST712-1A 0309> Removable Changer SCSI-2 device 
ch0: 3.300MB/s transfers
ch0: 74 slots, 1 drive, 1 picker, 2 portals
sa0 at ahc0 bus 0 target 5 lun 0
sa0: <AMPEX DST-20DBU > Removable Sequential Access SCSI-2 device 
sa0: 20.000MB/s transfers (10.000MHz, offset 8, 16bit)

'chio ielem' takes about 74 seconds, or 1 second for each tape.

I've also got a Qualstar 4210 w/ 1 AIT drive in another machine:

<SONY SDX-300C 0400>               at scbus1 target 5 lun 0 (pass4,sa0)
<QUALSTAR TLS-4210 1.30>           at scbus1 target 6 lun 0 (pass5,ch0)

It takes almost no time to do a 'chio ielem':

# /usr/bin/time chio ielem
        0.24 real         0.00 user         0.00 sys

It does an inventory on startup, and has sensors on the door, so I suppose
it knows pretty well where all the tapes are.

The Ampex also does an inventory on startup, and doesn't really need the
initialize element status.

> Obviously it isn't actually loading each tape as I feared it might.
> Unfortunately I'm not normally anywhere within visual range of it, so
> I've not actually watched what it does when it initializes.

Ken
-- 
Kenneth Merry
ken@plutotech.com