Re: Informix on AIX using logical volume

In article <4hkee3$6cf@news.asiaonline.net>, joelee@asiaonline.net (Lee Yam Fong) writes: |> hi, |> |> our company provides backup service for a client runnig Informix-online v6(?) |> on RS/6000 950 with AIX v3.2. we have little knowledge on AIX and none on |> Informix. here is the question: |> |> with every physical disk, the client create a volume group and then partition |> the volume group into logical volumes of certain sizes. some of these logical |> volumes will be used as raw disks for storing informix database. |> |> because the disks size of our machine are different from their disks and |> our total disk space is less than theirs, to save space, we want to group |> all our disks into a large volume group and then partition it into logical |> volumes efficently. for each informix volume , we will create a logical |> vulume with exactly the same size and name as that on the client machine. |> When restoring database from informix-format backup tapes, will there be |> any problem? we were told by the client that informix bypass AIX's logical |> volume manager and access the disk directly . Therefore, the approach will |> not work once the disk gemotry is changed. |> |> I don't believe informix is that stupid and inflexible. if this is true, |> we will be in big trouble. please advise me on this. |> |> Thanks |> |> Joe Lee This is incorrect. I run AIX here and duplicate by database on five different machines none of which have the same disk architecture. All that is necessary, as you surmised, is that the target machine (the one you will restore to) has LV's of the same size and name as the source machine. Informix is ignorant of the physical implementation of where the LV's are (as it should be). The tbtape -r will check this right at the beginning of the restore process. Just remember to change the ownership of the LV's in /dev to informix.informix before the restore. -- ---------------------------------------------------------------------------- Mike Reetz reetz@ucar.edu 3450 Mitchell Ln BIS Computing System and Network Manager (303)497-8881 FL1 UCAR - University Corporation For Atmospheric Research Boulder, CO 80301