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| author | Richard W.M. Jones <rjones@redhat.com> | 2012-05-14 17:47:57 +0100 |
|---|---|---|
| committer | Richard W.M. Jones <rjones@redhat.com> | 2012-05-14 17:47:57 +0100 |
| commit | 2fd2c85f6a42575749b9d38bd2f1512ae25db760 (patch) | |
| tree | 8e03a3a9528aa0902783eb2dcfe3ec930b47e13a /daemon | |
| parent | e8ec521dc64208016b0dc8dcb873324819ed734d (diff) | |
| download | libguestfs-2fd2c85f6a42575749b9d38bd2f1512ae25db760.tar.gz libguestfs-2fd2c85f6a42575749b9d38bd2f1512ae25db760.tar.xz libguestfs-2fd2c85f6a42575749b9d38bd2f1512ae25db760.zip | |
doc: Add notes on how GPT works on 4k sector disks.
I used scsi_debug to create a 4k sector virtual disk:
modprobe scsi_debug dev_size_mb=128 sector_size=4096
I then used 'gdisk' to create lots of partitions, and used 'hexdump'
to examine what was written to disk.
Diffstat (limited to 'daemon')
| -rw-r--r-- | daemon/parted.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/daemon/parted.c b/daemon/parted.c index 26100422..1a020f9b 100644 --- a/daemon/parted.c +++ b/daemon/parted.c @@ -199,7 +199,9 @@ do_part_disk (const char *device, const char *parttype) * * - 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. + * + * *=except for 4k sector disks, where only 6 sectors are required */ const char *startstr = "128s"; const char *endstr = "-128s"; |