part-disk: Change default alignment of this to 64K (128 sectors).

[libguestfs.git] / daemon / parted.c

diff --git a/daemon/parted.c b/daemon/parted.c
index dbcae03..0d22948 100644 (file)
--- a/daemon/parted.c
+++ b/daemon/parted.c
@@ -184,15 +184,16 @@ do_part_disk (const char *device, const char *parttype)
     return -1;
   }
 
     return -1;
   }
 

-  /* Align all partitions created this way to 64 sectors, and leave
-   * the last 64 sectors at the end of the disk free.  This wastes
-   * 32K+32K = 64K on 512-byte sector disks.  The rationale is:
+  /* Align all partitions created this way to 128 sectors, and leave
+   * the last 128 sectors at the end of the disk free.  This wastes
+   * 64K+64K = 128K on 512-byte sector disks.  The rationale is:

    *
    * - aligned operations are faster
    *
    * - aligned operations are faster

+   * - absolute minimum recommended alignment is 64K (1M would be better)

    * - GPT requires at least 34 sectors at the end of the disk.
    */
    * - GPT requires at least 34 sectors at the end of the disk.
    */

-  const char *startstr = "64s";
-  const char *endstr = "-64s";
+  const char *startstr = "128s";
+  const char *endstr = "-128s";

 
   RUN_PARTED (return -1,
               device,
 
   RUN_PARTED (return -1,
               device,