Comment # 9 on bug 1172566 from heming zhao

this bug had been rootcaused.

in lib/metadata/cache_manip.c
```
int cache_vol_set_params()
{
   ... ...
        if (!meta_size) {
                //heming:
                //the 128GB won't match below 3 if-"else if" branch.
                //so, meta_size is zero, then the meta_size will setup
                //to default value 4MB. it will cause device_mapper report
                //"No space left on device"
                if (pool_lv->size < (128 * ONE_MB_S))
                        meta_size = 16 * ONE_MB_S;


                else if (pool_lv->size < ONE_GB_S)
                        meta_size = 32 * ONE_MB_S;

                else if (pool_lv->size < (128 * ONE_GB_S))
                        meta_size = 64 * ONE_MB_S;


                if (meta_size > (pool_lv->size / 2))
                        meta_size = pool_lv->size / 2;

                if (meta_size < min_meta_size)
                        meta_size = min_meta_size;

                if (meta_size % extent_size)
                        meta_size += extent_size - meta_size % extent_size;
        }
   ... ...
}
```

upstream had been fixed this issue by commit: 
c08704cee7e34a96fdaa453faf900683283e8691

I will provide test rpm package ASAP.