Zane, > On Feb 20, 2018, at 7:58 PM, [email protected] wrote: > > Date: Tue, 20 Feb 2018 19:58:31 -0800 > From: Zane Healy <[email protected] <mailto:[email protected]>> > To: Mark Pizzolato <[email protected] <mailto:[email protected]>> > Cc: simh <[email protected] <mailto:[email protected]>> > Subject: Re: [Simh] VAX Tape Emulation? > Message-ID: <[email protected] > <mailto:[email protected]>> > Content-Type: text/plain; charset=utf-8 > > >> On Feb 20, 2018, at 1:58 PM, Mark Pizzolato <[email protected] >> <mailto:[email protected]>> wrote: >> >> I would actually attribute the 'improved' behavior to the fact that tape I/O >> to TQ >> and XQ devices is asynchronous in the latest code. >> >> I would seriously consider Mr Baker's suggestion of backing up to simh >> disks. Not to save sets, but to merely using VMS backup to perform >> BACKUP/Image to RQ units attached to disk container files. Thus allowing >> any recovery you might need to have random access to the original file >> system without having to dig through a save set sequentially. >> >> An industrious fellow might also want to manage the RQ media setup and >> change activities automatically from the AXP system with a program that does >> a TCP connect to a simh Remote Console. >> >> - Mark > > Based on the documentation, the TQ device appears to be limited to 2000GB. > As a result I’ve been using the TS device. > > Realistically, once I get these “tapes” created, I’ll be migrating part of > the data from physical disks on the Alpha, to disks on SIMH/VAX. I’ve > already done some experimentation with that. Unfortunately I have ODS-5 > data, and some software requires an Alpha.
> ... > End Result, I think I’m going to have to resort to the disk solution. > > Zane You should be able to write an ODS-5 backup save set to an ODS-2 disk image on your SIMH VAX. It may help you decide whether the cluster I/O or the virtual tape drive is the culprit crashing your VAX. Make the VAX disk large enough. Cluster mount it. Do the backup entirely from the Alpha using MSCP I/O. One thing I've never tried is to restore ODS-5 files to an ODS-2 disk. Does BACKUP give you some options to at least deal with renaming non-ODS-2 file names? Larry Baker US Geological Survey 650-329-5608 [email protected]
_______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
