How do I use "realtime subvolume" for storing video data?

How do I use "realtime subvolume" for storing video data?

[hank peng]

Hi, folks:
I am using XFS in storing video suvillence data, and today I found
"realtime subvolume" feature on SGI website. I used to make xfs with
default parameters, but I think this feature is maybe very useful to
me.
SGI website said: XFS supports the notion of a "realtime subvolume" -
a separate area of disk space where only file data is stored.  This is
really what I need, since disk space become biger and biger nowerdays,
if some sectors are corrupted, video data is lost which is acceptable
but the whole XFS filesystem down is not acceptable.

I googled some information, but it seems that few people made use of
this feature. I wonder if it is usable in my case and how do I use it?

-- 
The simplest is not all best but the best is surely the simplest!

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Re: How do I use "realtime subvolume" for storing video data?

[Eric Sandeen]

hank peng wrote:
> Hi, folks:
> I am using XFS in storing video suvillence data, and today I found
> "realtime subvolume" feature on SGI website. I used to make xfs with
> default parameters, but I think this feature is maybe very useful to
> me.
> SGI website said: XFS supports the notion of a "realtime subvolume" -
> a separate area of disk space where only file data is stored.  This is
> really what I need, since disk space become biger and biger nowerdays,
> if some sectors are corrupted, video data is lost which is acceptable
> but the whole XFS filesystem down is not acceptable.
> 
> I googled some information, but it seems that few people made use of
> this feature. I wonder if it is usable in my case and how do I use it?

build with CONFIG_XFS_RT=y, and see the mkfs man page for the -r option.

Then mount with -o rtdev=/dev/blah

And test the heck out of it, it doesn't get that much use.

-Eric

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