) (08/19/89)
I am posting this for a friend and will on vacation for the next week so
i can't respond.
I just added a SCSI (miniscribe 8051S ) to my 2090A, and after running
diskperf, it is about 3 times SLOWER than my ST225 connected on
the same interface. In fact it is as slow as the first partition
that uses the OFS (Old File System).
What are the parameters that can be changed to make it faster ?
Interleave is now at 0 (none) and bufmemtype is 4 (fast ram). I
tried increasing buffers to 60, but no improvement.
When I PREPed the drive, it said the number of cylinders was 964
yet the 8051S tech manual gives 739 cylinders ? why ?
Shoul I match the mountlist to the drive number for number ?
Another thing, formatting takes a looong time, 30 minutes for the
40 meg, is this normal ?
Following is my mountlist, but first what I did this morning after
I got POed and killed the power at 23:30 last night. I again tried
to prep the thing, and it seems that if the menu selection of SCSI
or ST-506 are used then 17 sectors are AUTOMATICLY assumed, the
only way to make it accept 28 sectors (like the Miniscribe has)
is to use the user defined option in the menu (option 0). Then
I formatted it again and it came out bigger (2.6 Mb for the 50
cylinders vs 2.0 Mb before) Oh yes it is formatted with the FFS
system. I again ran diskperf and the thing must be filled with
molasses because it topped out at around 45Kb for a read with 32K
buffers.
To further confuse things, my buddy has the same drive (bought at
the same time), but hooked up to a Supra controller on his 1000
and IT is slow too. He tried OFS and the results were worse 15Kb
with 32K buffers and about the same as mine with the FFS. Are we
living trough the Mac SCSI slowdown that affected the Seagate drives
not too long ago? And how are drives slowed down?
AAAAAAAAAARRRRRRRRRRGGGGGGGGG!!!!!!
RES0: Device = hddisk.device <------ THIS IS FOR THE ST225
Unit = 1
Flags = 0
Surfaces = 4
BlocksPerTrack = 17
Reserved = 0
Interleave = 0
LowCyl = 0 ; HighCyl = 1
Buffers = 1
BufMemType = 4
#
RES2: Device = hddisk.device <------ THIS IS FOR THE SCSI
Unit = 3
Flags = 0
Surfaces = 4
BlocksPerTrack = 28
Reserved = 0
Interleave = 0
LowCyl = 0 ; HighCyl = 1
Buffers = 1
BufMemType = 4
#
------------------------------------------------------------------------
NEWCON:, PIPE:, RAD:... CUT OUT FROM HERE
------------------------------------------------------------------------
DI0:
Device = hddisk.device <------ THIS IS FOR MY ST225 (20M)
FileSystem = l:FastFileSystem
Unit = 1
Flags = 0
Surfaces = 4
BlocksPerTrack = 17
Reserved = 2
Interleave = 0
LowCyl = 33 ; HighCyl = 612
Buffers = 30
GlobVec = -1
BufMemType = 4
Mount = 1
DosType = 0x444F5301
StackSize = 4000
#
Dh2: <------ THIS ENTRY IS FOR THE NEW
Device = hddisk.device SCSI DRIVE (Miniscribe 8051S)
FileSystem = l:FastFileSystem
Unit = 3
Flags = 0
Surfaces = 4
BlocksPerTrack = 28
Reserved = 2
Interleave = 1
LowCyl = 2 ; HighCyl = 50 <------ THIS IS ONLY TO CUT DOWN
Buffers = 30 FORMATTING TIME
GlobVec = -1
BufMemType = 4
Mount = 1
DosType = 0x444F5301
StackSize = 4000
#
My freind called Supra to ask them about this speed issue, the person
there told him the drive was fine and that they were using the same
drive and getting 250Kb transfer rates. However, he said that the
drive was running a "new" version of the SCSI protocol and the
interface would need to be upgraded (soft + hard {ROM?}), has anyone
heard about "new" protocol being used by SCSI drives/controllers?
Jean
Mark Kaye | | |
Box 172, Munster Hamlet | 613-838-3580 | kaye@fscore.dec.com |
Ontario, Canada K0A 3P0 | | DEC fscore::kaye or kaye @kao |