filesetup: add native fallocate

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 6e53cff81fec4cf4f4b5533a2c9cd6ccdb2793c7..cf46349233f095bf5c786e4fed3bad5dc12ec8a3 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1049,6 +1049,10 @@ I/O type
                **none**
                        Do not pre-allocate space.
 
+               **native**
+                       Use a platform's native pre-allocation call but fall back to
+                       **none** behavior if it fails/is not implemented.
+
                **posix**
                        Pre-allocate via :manpage:`posix_fallocate(3)`.
 
@@ -1063,8 +1067,9 @@ I/O type
                        Backward-compatible alias for **posix**.
 
        May not be available on all supported platforms. **keep** is only available
-       on Linux. If using ZFS on Solaris this must be set to **none** because ZFS
-       doesn't support it. Default: **posix**.
+       on Linux. If using ZFS on Solaris this cannot be set to **posix**
+       because ZFS doesn't support pre-allocation. Default: **native** if any
+       pre-allocation methods are available, **none** if not.
 
 .. option:: fadvise_hint=str