[Info-vax] Defrag Fails on a Large Disk

[Stephen Hoffman]

On 2018-02-27 02:30:14 +0000, richard.l.dyson at gmail.com said:

> Hi,
> 
> I have an IA64 rx2660 running OpenVMS v8.1-1H1.  Can't upgrade to 
> anything else, off support.  I have a single spindle disk, 600 GB SAS.  
> Every time I run Defrag (v3.0) I get this error:
> 
> %SYSTEM-W-ACCVIO, access violation, reason mask=!XB, virtual 
> address=!XH, PC=!XH, PS=!XL
> ,,,
> Any suggestions to try?  Or other info needed?

Ditch the DFO defragmentation tool, fix your extent sizes — the 
defaults for that are utterly absurd — tweak any apps or odd cases 
where you have access to that, and use the DFU freeware tool where you 
really need to defrag something, partition your large files on volumes 
away from and your transient and junk and log files, and avoid filling 
your disks close to capacity and toward where fragmentation tends to be 
incurred.  Or migrate to SSDs or to better-grade caching storage 
controllers, and the problem with fragmentation mostly or completely 
vaporizes.   You'll also probably have more "fun" with the RMS internal 
fragmentation that arises, if that's not been looked at in a while.  
Moving from V8.3-1H1 to V8.4-2L1 will get you support, though — if you 
can't swing $50 for a switch, it's probably better to start working on 
(or continuing with) wholesale migration away from OpenVMS (which I'd 
suspect is the long-term goal here).  Oh, and punt this whole mess up 
to the front office to let them know about the trade-offs that are and 
will continue to arise here.  SSL is (or will soon be) another area of 
"fun" when running a version as old as V8.3-1H1, too.




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