Devspace of type file(F) and raw(R) together

I have a database with data devspaces located in a filesystem (F).
I want to migrate to devspaces of the type raw (R).
My Question: Can I use both types of devspaces in one database together?
Thanks for any help.
Bernhard

> For very modern filesystems (ZFS, VxFS > 4) this may be true but the FS check for e. g. ext3 and UFS still check the inode integrity compared to/in the superblocks, in practice checking an ext3 even with one big file can take hours. On Linux this will be done every 180 days after rebooting if not switched off before. This can increase a downtime unexpectedly if you don't know that you need to switch it off.
I stand corrected on this - thanks for pointing out this. Really might become naughty on the half-yearly reboot.weekend,...
> > Concerning the faster extension... we format RAW devices too  - so where do you expect to save time here?
>
> Just for curiosity: since when are RAW devices formatted? I can build a 4 TB database in about 10 minutes where 9,5 minutes are used to format the log area; using a filesystem this is a several-10-hour task with high load on the SAN, even if formatted sequentially. I never saw in the last 12+ years that RAW devices are really "fomatted" as the log area is
>
> Two weeks ago I added 400 GB to a database using a script, it didn't take a minute until the space was available so I don't know...
Hmm... Ok, I just spend half an hour wading through what is called our Volume-Management code...
Really looks like as if we just performa few wrtie I/Os into the RAW devs (something like, start - middle - end of the whole device area) and write the header page.
You could have the same behaviour for Filesystem-Data-Vols by switching off formatting via the DB parameter.
Why this is just done for Data-Volumes? Phew.. no idea actually.
> > The reason why we changed the recommendation is simply that the benefits don't equal out the potential problems that can occur due to things like double allocation, handling mistakes etc.
>
> Sapinst (up to 7.0 SR3) still has "raw device" as default selected. One has to explicitly choose filesystem, I don't know, however, for later installations.
>
> I still think that RAW devices are a better choice for big installations, nobody can accidentially to an rm -rf I agree though that the handling is different and that one has to take special care.
Well... ahem... the installation media barely represent current recommendations.
No parameters, no recent patches, no nothing.
Basically they represent a defined and working starting setup from where you can move on (<-- MY personal opinion! Not to be mistaken as official! ).
Seen that way I totally agree with Oracles decision to kick out RAW device support and I wouldn't recommend to move to them either. (but also not to convert a working RAW dev-installation to filesystem  - the effect is simply not worth the conversion effort).
Hey, Markus - thanks for pointing my misbelieves here!
regards,
Lars

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