docs: Clean up mount options

* Stop specifying logbufs=8; that's the default
* Stop including nodiratime with noatime; the latter implies the former

Nothing wrong with being explicit, I suppose, but may as well keep the
mount options to what we can easily explain: we want noatime because
Swift does not use atime, so we don't want to lose any performance to
tracking atime.

Change-Id: I1e52b4368ad7eb375964eee5132bc50297536355

doc/source/deployment_guide.rst

@@ -2331,7 +2331,7 @@ headroom.
 
 The following example mount options are recommended when using XFS::
 
-    mount -t xfs -o noatime,nodiratime,logbufs=8 -L D1 /srv/node/d1
+    mount -t xfs -o noatime -L D1 /srv/node/d1
 
 We do not recommend running Swift on RAID, but if you are using
 RAID it is also important to make sure that the proper sunit and swidth

doc/source/development_saio.rst

@@ -141,7 +141,7 @@ another device when creating the VM, and follow these instructions:
 
 #. Edit ``/etc/fstab`` and add::
 
-      UUID="<UUID-from-output-above>" /mnt/sdb1 xfs noatime,nodiratime,logbufs=8 0 0
+      UUID="<UUID-from-output-above>" /mnt/sdb1 xfs noatime 0 0
 
 #. Create the Swift data mount point and test that mounting works::
 
@@ -169,7 +169,7 @@ these instructions:
 
 #. Edit `/etc/fstab` and add::
 
-      /srv/swift-disk /mnt/sdb1 xfs loop,noatime,nodiratime,logbufs=8 0 0
+      /srv/swift-disk /mnt/sdb1 xfs loop,noatime 0 0
 
 #. Create the Swift data mount point and test that mounting works::
 
@@ -258,23 +258,23 @@ environment variable.
 
 * To mount the tmp loopback device at ``/tmp``, do the following::
 
-      sudo mount -o loop,noatime,nodiratime /srv/swift-tmp /tmp
+      sudo mount -o loop,noatime /srv/swift-tmp /tmp
       sudo chmod -R 1777 /tmp
 
   * To persist this, edit and add the following to ``/etc/fstab``::
 
-        /srv/swift-tmp /tmp xfs rw,noatime,nodiratime,attr2,inode64,noquota 0 0
+        /srv/swift-tmp /tmp xfs rw,noatime,attr2,inode64,noquota 0 0
 
 * To mount the tmp loopback at an alternate location (for example, ``/mnt/tmp``),
   do the following::
 
       sudo mkdir -p /mnt/tmp
-      sudo mount -o loop,noatime,nodiratime /srv/swift-tmp /mnt/tmp
+      sudo mount -o loop,noatime /srv/swift-tmp /mnt/tmp
       sudo chown ${USER}:${USER} /mnt/tmp
 
   * To persist this, edit and add the following to ``/etc/fstab``::
 
-        /srv/swift-tmp /mnt/tmp xfs rw,noatime,nodiratime,attr2,inode64,noquota 0 0
+        /srv/swift-tmp /mnt/tmp xfs rw,noatime,attr2,inode64,noquota 0 0
 
   * Set your ``TMPDIR`` environment dir so that Swift looks in the right location::
 

doc/source/install/storage-install-obs.rst

@@ -59,8 +59,8 @@ storage nodes, you must prepare the storage devices.
 
    .. code-block:: none
 
-      UUID="<UUID-from-output-above>" /srv/node/sdb xfs noatime,nodiratime,logbufs=8 0 2
+      UUID="<UUID-from-output-above>" /srv/node/sdb xfs noatime 0 2
-      UUID="<UUID-from-output-above>" /srv/node/sdc xfs noatime,nodiratime,logbufs=8 0 2
+      UUID="<UUID-from-output-above>" /srv/node/sdc xfs noatime 0 2
 
 #. Mount the devices:
 

doc/source/install/storage-install-rdo.rst

@@ -58,8 +58,8 @@ storage nodes, you must prepare the storage devices.
 
    .. code-block:: none
 
-      UUID="<UUID-from-output-above>" /srv/node/sdb xfs noatime,nodiratime,logbufs=8 0 2
+      UUID="<UUID-from-output-above>" /srv/node/sdb xfs noatime 0 2
-      UUID="<UUID-from-output-above>" /srv/node/sdc xfs noatime,nodiratime,logbufs=8 0 2
+      UUID="<UUID-from-output-above>" /srv/node/sdc xfs noatime 0 2
 
 #. Mount the devices:
 

doc/source/install/storage-install-ubuntu-debian.rst

@@ -58,8 +58,8 @@ storage nodes, you must prepare the storage devices.
 
    .. code-block:: none
 
-      UUID="<UUID-from-output-above>" /srv/node/sdb xfs noatime,nodiratime,logbufs=8 0 2
+      UUID="<UUID-from-output-above>" /srv/node/sdb xfs noatime 0 2
-      UUID="<UUID-from-output-above>" /srv/node/sdc xfs noatime,nodiratime,logbufs=8 0 2
+      UUID="<UUID-from-output-above>" /srv/node/sdc xfs noatime 0 2
 
 #. Mount the devices:
 

docker/rootfs/etc/swift_build/build_devices

@@ -56,7 +56,7 @@ if [[ $MY_STORAGE_TYPE == "internal_devices" ]] || [[ $MY_STORAGE_TYPE == "exter
     # echo "created storage device /dev/swift-d$i of $DEV_SIZE";
     mkfs.xfs -f -L D$i -i size=512 /dev/$device;
     echo "  created XFS file system on device /dev/$device";
-    mount -t xfs -o noatime,nodiratime,logbufs=8 /dev/$device /srv/node/$device;
+    mount -t xfs -o noatime /dev/$device /srv/node/$device;
     echo "  mounted /dev/$device as /srv/node/$device";
   done
 fi

tools/playbooks/multinode_setup/configure_loopback.yaml

@@ -31,7 +31,7 @@
         state: directory
 
     - name: mount /mnt/sdb1
-      mount: name=/mnt/sdb1 src=/srv/swift-disk fstype=xfs opts="loop,noatime,nodiratime,logbufs=8" dump=0 passno=0 state=mounted
+      mount: name=/mnt/sdb1 src=/srv/swift-disk fstype=xfs opts="loop,noatime" dump=0 passno=0 state=mounted
 
     - name: create sub-partitions
       file:

tools/playbooks/saio_single_node_setup/setup_saio.yaml

@@ -29,7 +29,7 @@
       file: path=/mnt/sdb1 state=directory
 
     - name: mount /mnt/sdb1
-      mount: name=/mnt/sdb1 src=/srv/swift-disk fstype=xfs opts="loop,noatime,nodiratime,logbufs=8" dump=0 passno=0 state=mounted
+      mount: name=/mnt/sdb1 src=/srv/swift-disk fstype=xfs opts="loop,noatime" dump=0 passno=0 state=mounted
 
     - name: create sub-partitions
       file: >