News Group Posts

informix 2gb partitions

From: Bela Lubkin <belal@sco.com>
Subject: Re: raw disks
Date: Fri, 29 Mar 2002 12:45:44 GMT
References: <aEoo8.1487$C_.13466@NewsReader>
<20020328215711.T22877@mammoth.ca.sco.com>
<pSYo8.7373$Vm5.61492@NewsReader> 

Neil Truby wrote:

> Thanks.
> The rdbms in question is Informix, which has an upper limit of
> (slice+offset) of 2Gbytes, so use of the entire disk is not a viable option.

Surely it must support using multiple raw partitions?  If you use
OpenServer's partitions & divisions to their fullest, you can have 28
divisions on a disk == 56GB.  Ok, won't let you use all of a reasonably
big current disk, but you can have 54GB of 2GB raw divisions + one big
Unix filesystem on the rest...

> I remain unclear whether, if I use the *first* partition on a disk, I risk
> over-writing some disk-wide vtoc info that file systems or other partitions
> on the disk may have needed.

Nothing special about the first partition.  Of course you have to use
the right device names -- /dev/rhd?[1-4] (/dev/rdsk/?s[1-4]) are
partitions 1-4, /dev/rhd?0 is _whole disk_... you could be tricked by
the seeming continuity of the names.  If you overwrite "partition 0",
i.e. the whole disk, you do lose all the partitions.

> However, if I'd asked this question on the solaris newsgroup I'd have
> received scores of replies saying it was a problem, which itself leads me to
> suspect that it isn't on SCO.

It's fine.

I recommend using divisions, for maximum flexibility.

>Bela<
 

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