[Info-vax] RAID vs. MOUNT/BIND

[Wilm Boerhout]

Phillip Helbig---undress to reply mentioned  on 18-11-2010 9:29:
> In article<4ce3ed4c$0$17369$c3e8da3$b280bf18 at news.astraweb.com>, JF
> Mezei<jfmezei.spamnot at vaxination.ca>  writes:
>
>> Phillip Helbig---undress to reply wrote:
>>
>>>       $ MOUNT/BIND=TEST3013 DSA3011/SHADOW=($1$DUA402:,$1$DUA403:),
>>>       DSA3012/SHADOW=($1$DUA404:,$1$DUA405:) TEST3011,TEST3012 TEST3013
>>
>> I was warned against mount/bind, but I used it to create a large enough
>> disk based on DSSI drives to emulate a single larger SCSI disk I had on
>> the Microvax II. I went ahead anyways. Whay could possibly go wrong ?
>>
>> LD driver went wrong, and when creating on large file, instead of
>> writing to the blocks on the right physical disk, it overwrote data on
>> the first physical disk of the set. I lost a lot of data and time
>> because of this.
>>
>> While LDdriver has since been fixed, I am rather weary of MIUNT/BIND
>> because I suspect there may be more utilities that were written without
>> any thought about multi volume disks.
>>
>> If you go ahead with it, make sure you get the latest LDdriver, not the
>> one that comes with VMS.
>
> Naïve question here: what is LDDRIVER and why would I need it?
>

LDDRIVER (maintained by www.digiater.nl) gives you the feature of using 
disk containers in VMS. Basically, you create a larg(ish) file and then 
$MOUNT the file as a VMS disk device (LDAn:).

In the context of this thread, one can quickly configure a (large) 
number of small disks to verify a hypothesis.

/Wilm

-- 
                       |
Wilm Boerhout         |
Zwolle,               |   'These are the times that try men's souls'
The Netherlands       |   (Thomas Paine, The Crisis)