co@etek.chalmers.se (Christer Olsson) (03/15/91)
I've heard some rumours that VMS 4.7 and some Qbus SCSI-controllers
has problems with large SCSI-drives (1 Gb or larger).
Can anyone confirm, deny or explain?
/Christer Olsson
--
Christer Olsson I MedNet I Phone: day: +46+31-853760
Kaggeledsgatan 11 I Medicinaregatan 7b I night: +46+31-843740
S-416 74 Gothenburg I S-400 33 Gothenburg I Email: co@adagio.fy.chalmers.se
Sweden I Sweden I SUNET: MEDNT2::C_OLSSONhardin@mavplus3.rtp.dg.com (Paul Hardin) (03/19/91)
In article <1991Mar15.131300.18910@etek.chalmers.se>, co@etek.chalmers.se (Christer Olsson) writes: |> |> |> I've heard some rumours that VMS 4.7 and some Qbus SCSI-controllers |> has problems with large SCSI-drives (1 Gb or larger). |> |> Can anyone confirm, deny or explain? |> The problem is that data can potentially be lost, with drives of formatted capacity greater than 1.073742 GBytes! There's a front-page article on this in the March 4, 1991 edition of "Digital News". According to the article, it affects all Ultrix releases, and VMS releases up to 5.4. Paul -- Speaking purely for myself... .---------------------------------------------------------------------. |Paul Hardin hardin@dg-rtp.dg.com | |Data General Corp., RTP NC {world}!mcnc!rti!xyzzy!hardin | `---------------------------------------------------------------------'
jesup@cbmvax.commodore.com (Randell Jesup) (03/23/91)
In article <1991Mar18.171629.29960@dg-rtp.dg.com> hardin@mavplus3.rtp.dg.com (Paul Hardin) writes: > The problem is that data can potentially be lost, with drives > of formatted capacity greater than 1.073742 GBytes! Depends on a) how you calculate Gig (if K=1024, M=K*K, G=K*M), then it's 1.0 Gig exactly (blocks 0 - $1fffff), b) logical block size. The 1Gig limit is for 512 byte logical blocks (probably the most common). For 1K logical blocks, it would be 2 Gig, etc. BTW, once I heard this I checked the commodore scsi drivers, and we have the same problem (the biggest drive we had checked was ~9xx Mb). Our drivers (A590/A2091/A3000) do use 10-byte read/writes, but only if the transfer size is > 256 blocks. We're fixing this, of course. At least we're in good company (Dec, both Ultrix and VMS). 1/2 :-) Anyone playing with >1Gig drives should either use >512 byte blocks (under 2.0 FS - don't forget to format the drive using the scsidirect interface for 1K logical blocks) or just not use that area until they get the fix (37.79 or better for A3000's). I wonder how many other people will be bitten by it. Anyone know about Apple, nExt, Sun? -- Randell Jesup, Keeper of AmigaDos, Commodore Engineering. {uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com BIX: rjesup The compiler runs Like a swift-flowing river I wait in silence. (From "The Zen of Programming") ;-)
rbabel@babylon.rmt.sub.org (Ralph Babel) (03/23/91)
In article <20048@cbmvax.commodore.com>, jesup@cbmvax.commodore.com (Randell Jesup) writes: > I wonder how many other people will be bitten by it. > Anyone know about Apple, nExt, Sun? GVP's FaaastROM SCSI driver handles this (all revisions). Ralph