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authorChristian Hesse <mail@eworm.de>2015-01-02 11:23:44 +0100
committerGerardo Exequiel Pozzi <vmlinuz386@gmail.com>2015-01-02 15:13:36 -0300
commite5a40e2d00dbb6a5b7f35ce69d885323a69469a8 (patch)
treeea09eb4f9fe1d664c76fb5b329f72a6124ab6366
parent1084bb1d6bf23dfd9ce01b446866a125b6ce1f38 (diff)
allow to change dm snapshot chunksize
Copying big amount of data results in bad performance as data is written in chunks of 4kiB (8 * 512 bytes). The default is not changed but can be overwritten. Signed-off-by: Christian Hesse <mail@eworm.de>
-rw-r--r--hooks/archiso3
1 files changed, 2 insertions, 1 deletions
diff --git a/hooks/archiso b/hooks/archiso
index 1bd9419..3ef4eb1 100644
--- a/hooks/archiso
+++ b/hooks/archiso
@@ -31,7 +31,7 @@ _mnt_fs() {
rw_dev=$(losetup --find --show "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")
echo ${rw_dev} >> /run/archiso/used_block_devices
- dmsetup create ${dm_snap_name} --table "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8"
+ dmsetup create ${dm_snap_name} --table "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} ${cow_chunksize}"
_mnt_dev "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" "-w"
echo $(readlink -f /dev/mapper/${dm_snap_name}) >> /run/archiso/used_block_devices
@@ -112,6 +112,7 @@ run_hook() {
fi
[[ -z "${cow_directory}" ]] && cow_directory="persistent_${archisolabel}/${arch}"
+ [[ -z "${cow_chunksize}" ]] && cow_chunksize="8"
# set mount handler for archiso
mount_handler="archiso_mount_handler"