> We found, that the main-databases were
> already excluded from virus-scanning, but the security-database was
> not. After adding a further exclusion for the security-database we saw
> a sharp drop in "create file failed" errors.

As a guess, this could mean the remaining problems might be related to
access to temporary files or lock files.

we anticipated this and have already excluded temp-directories where we saw temporary gradle and firebird files. Our assumption is, that we simply have too much stress on the RAID on a hardware level regardless of virus-scan etc.

Kind regards,
Jonathan