Re: Creating raw disk devices for use by IDS 7.3X

Philippe Fornaciari wrote: > Can someone tell me how to create a raw disk device for access by Informix > IDS 7.3x on AIX 4.3.2? > e.g. I would like to create a 32mb rootdbs on a raw disk. > > Best regards. > > Philippe Fornaciari > Summit Technologies International > p.fornaciari@summittechnologies.com Hi Philippe, You just create a logical volume (e.g. with the name rootdbs) without a file system on it, If you want, you may specify "raw" in the type field, but it's rather documentary. Then you dedicate it to user and group informix and set the access rights: chown informix.informix /dev/rootdbs /dev/rrootdbs chmod 664 /dev/rootdbs /dev/rrootdbs At this point /dev/rrootdbs is ready to use, but you should create a symbolic link to it. In Informix you use it by the symbolic link, that gives you more flexibility. Also, it is recommended to use a 4k offset when you create the dbspace or chunk as AIX stores some logical volume information in the first 512 bytes. It should not disturb AIX too much if this information is destroyed, but there have been some rumours that sometimes the restore of the database does not work if there was no offset. So, better be on the secure side. Regards -- Helmut Leininger Bull AG / Vienna Open Systems Support Email: h.leininger@bull.at helmut.leininger@bull.net This opinion is mine and not necessarily that of my employer. No guarantees whatsoever.