[Pvfs2-developers] [PATCH] modify twod-stripe's default params and add some documentation

[Kyle Schochenmaier]

Patch is against cvs head, and modifies the default num_groups to be 1
and the group_strip_factor = 1  so twod-stripe's defaults still work
when you use it on a single-server, it will now by default behave the
same as simple-stripe until the user modifies the num_groups and
strip_factor xattrs.

Also added a brief description of the definitions for the dist_params
in twod-stripe.

Tested fully functional on my servers.

Kyle


Index: src/io/description/dist-twod-stripe.c
===================================================================
RCS file: /anoncvs/pvfs2/src/io/description/dist-twod-stripe.c,v
retrieving revision 1.5
diff -r1.5 dist-twod-stripe.c
6a7,15
> /* twod-stripe will take all of the servers in the filesystem and
>  * partition them into num_groups groups.  Data will then be striped to
>  * each group before we move onto the next group.  The strip_factor will
>  * determine how many chunks of strip_size are written to each server
>  * in each group before we transition to the next group.
>  * The striping on the group level is done round-robin in the same
>  * fashion as simple-stripe
>  */
>


Index: include/pvfs2-dist-twod-stripe.h
===================================================================
RCS file: /anoncvs/pvfs2/include/pvfs2-dist-twod-stripe.h,v
retrieving revision 1.4
diff -r1.4 pvfs2-dist-twod-stripe.h
17c17
< #define PVFS_DIST_TWOD_STRIPE_DEFAULT_GROUPS 2
---
> #define PVFS_DIST_TWOD_STRIPE_DEFAULT_GROUPS 1
19c19
< #define PVFS_DIST_TWOD_STRIPE_DEFAULT_FACTOR 256
---
> #define PVFS_DIST_TWOD_STRIPE_DEFAULT_FACTOR 1


-
Kyle Schochenmaier
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