Re: The XFS real-time subvolume in Linux

[Eric Sandeen <sandeen@xxxxxxx>]

Dubravko Markic wrote:
> Hello,
>       My name is Dubravko Markic and i am working with the XFS 
> filesystem as part of my project. I am using a Linux operating system, 
> or better yet, a SuSe CORE 9 system. I have installed XFS filesystem on 
> one of the partitions on my computer. My XFS filesystem has a default 
> configuration, which means that no real-time subvolume is enabled.
>
> My question to you is: what do i do in order to enable real-time 
> subvolume on my XFS filesystem? 

If it is truly not enabled on your SuSE, then you will need to rebuild xfs 
after changing CONFIG_XFS_RT.  But:

penguin3:~ # zcat /proc/config.gz  | grep XFS_RT
CONFIG_XFS_RT=y
penguin3:~ # uname -a
Linux penguin3 2.6.5-7.193-debug #1 SMP Wed Jul 20 14:39:18 UTC 2005 i686 i686 
i386 GNU/Linux

This is a SLES9SP2 box, but it appears that recent SuSE kernels are RT-enabled.

> Also if i understood correctly under 
> Linux one does not have the GRIO (guranteed rate I/O) option, this is 
> only available under the IRIX operating system, right? Thanks a bunch

That is basically true, yes.  There is a non-free GRIOV2 product in use with 
CXFS, but for your purposes, I think it is safe to say that there is no 
standalone GRIO equivalent on Linux.

-Eric