[rhn-users] Using tmpfs

[Charith Perera]

Hi everyone,

I've run into a problem with using a temporary file system for Sybase. This 
may turn out to be a Sybase issue, so if you think that is the case then 
please point it out immediately. In either case any solutions are definitely 
welcome.

I've put a line in /etc/fstab as follows:

tmpfs /dev/sybase_tempdb  tmpfs mode=700,rw,size=3G 0 0

As suggested by this guide : http://www.peppler.org/FAQ/linux.html#q1.19


When we attempt to initialize a sybase device for tempdb the following error 
is returned. When we use an ext3 partition everything goes fine. 

dopen: open '/dev/sybase_tempdb/tempdb.dat', Invalid argument
udactivate: error starting vidtual disk 2


>From the sybase website at 
http://www.sybase.com/detail/printthis/1,6907,20336,00.html I found this:

"Sometimes Sybase Adaptive Server Enterprise reports disk I/O errors when 
current disk analysis shows there are no such errors."

My question to you is, is there a difference from an application's point of 
view if a filesystem is tempfs or ext3? My initial guess was that it should 
be transparent to the application, but now I doubt that or I'm not setting up 
the temporary filesystem properly. I'm about to create files as the same user 
being used by the application.

Thanks

Charith Perera.