DD ingress buffering

On remote server it seems to be beneficial to buffer data before dumping it on drive. Especially if underlying FS sync's all. This happens to be the call over NFS.
ServerAstra · Dec 28, 2015 · 41e4050 · 41e4050
1 parent 4d1ae4b
commit 41e4050
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/gnt_ext_backup.py b/gnt_ext_backup.py
@@ -63,7 +63,7 @@ def __init__(self, **kwargs):
         self.lv_backup_extension = 'bak'
         self.backup_folder = './upload/'
         self.backup_extension = 'raw'
-        self.compression = {'egress': '| lz4 -1c |', 'ingress': 'lz4 -dc >'}
+        self.compression = {'egress': '| lz4 -1c |', 'ingress': 'lz4 -dc |'}
         self.debug = 0
         self.instances_names = None
         self.dd_buffer = '128M'
@@ -132,7 +132,8 @@ def perform_backup(self):
                         self.compression['egress'],
                         self.ssh_cmd,
                         "'" + self.compression['ingress'],
-                        self.backup_folder +
+                        "dd bs=" + self.dd_buffer,
+                        "of=" + self.backup_folder +
                         '.'.join(
                             [self.unique_id, drive['lv'], name, primary_node, self.backup_extension]),
                         "'\""