rbabel@babylon.rmt.sub.org (Ralph Babel) (03/25/91)
In article <1991Mar25.174202.14540@mintaka.lcs.mit.edu>, vho@gnu.ai.mit.edu (Viet Ho) writes: > OK, I just got my ICD and here's what I got with diskperfa: Remember that ICD's caching algorithm uses deferred writes! Just imagine a system crash right before CMD_UPDATE ... Ralph
vho@gnu.ai.mit.edu (Viet Ho) (03/26/91)
OK, I just got my ICD and here's what I got with diskperfa: DiskPerfa on ICD Advantage 2000 SCSI controller CPU: 68000 @ 7.14 Mhz Quantum 105s 19ms HD, 1 interleave, 74MB partition freshly formatted Create Files: 46 files/sec. Directory Scan: 103 entries/sec. Delete Files: 84 files/sec. Seek/Read Test: 139 seek/sec. Read/Write Speed Test: (bytes/sec.) Buffer: 512 Read: 69,830 Write: 61,768 Buffer: 4k Read: 247,305 Write: 173,605 Buffer: 8k Read: 260,839 Write: 203,527 Buffer: 32k Read: 468,114 Write: 371,835 Buffer: 64k Read: 577,409 Write: 410,884 Buffer: 256k Read: 647,269 Write: 437,636 Hey, I'd like to see the specs on the TrumpCard Pro w/ and w/out 68030 on the Quantum! I was gonna get that instead of the ICD... -Viet From: vho@gnu.ai.mit.edu (Viet Ho) Newsgroups: comp.sys.amiga.marketplace Subject: TrumpCard 4 sale References: Sender: Followup-To: Distribution: world Organization: The Internet Keywords: I have a Trumpcard A2000 SCSI controller (not TrumpPro) for sale. IT comes with cables and installation software but not hardcard mountings. I'm asking for $75.
ben@epmooch.UUCP (Rev. Ben A. Mesander) (03/26/91)
>In article <07027.AA07027@babylon.rmt.sub.org> rbabel@babylon.rmt.sub.org (Ralph Babel) writes: >In article <1991Mar25.174202.14540@mintaka.lcs.mit.edu>, >vho@gnu.ai.mit.edu (Viet Ho) writes: > >> OK, I just got my ICD and here's what I got with diskperfa: > >Remember that ICD's caching algorithm uses deferred writes! >Just imagine a system crash right before CMD_UPDATE ... Yeah, that's the case with UNIX, too though. It should be fine as long as you don't go snapping your Amiga on and off like a toaster or something. Let's just say I haven't had much problem with deferred writes on my Sun-3 >Ralph -- | ben@epmooch.UUCP (Ben Mesander) | "Cash is more important than | | ben%servalan.UUCP@uokmax.ecn.uoknor.edu | your mother." - Al Shugart, | | !chinet!uokmax!servalan!epmooch!ben | CEO, Seagate Technologies |
rbabel@babylon.rmt.sub.org (Ralph Babel) (03/27/91)
In article <ben.5492@epmooch.UUCP>, ben@epmooch.UUCP (Rev. Ben A. Mesander) writes: >> Remember that ICD's caching algorithm uses deferred writes! >> Just imagine a system crash right before CMD_UPDATE ... > > Yeah, that's the case with UNIX, too though. It should be fine as long as > you don't go snapping your Amiga on and off like a toaster or something. > Let's just say I haven't had much problem with deferred writes on my Sun-3 True. But on a Sun, an illegal pointer (for example) would cause a kernel function to return EFAULT. Maybe you'll get a coredump if Really Bad Things happen. But a KERNEL PANIC or a complete system lockup is much less likely to occur on a UNIX machine than a GURU (or a crash) on an Amiga. I don't see any problems with deferred writes on a system with full MMU protection and separation between kernel and user space, but I wouldn't recommend it for an Amiga. Ralph