</td></tr></tbody></table>
-Install each dependency that isn't installed on your host. For Debian/Ubuntu
+Install each dependency that is not installed on your host. For Debian/Ubuntu
distributions, execute the following::
sudo apt-get install gcc python-dev python-pip python-virtualenv libxml2-dev libxslt-dev doxygen graphviz ant ditaa
wget http://rpmfind.net/linux/centos/7/os/x86_64/Packages/python-sphinx-1.1.3-11.el7.noarch.rpm
sudo yum install python-sphinx-1.1.3-11.el7.noarch.rpm
-Ceph documentation makes extensive use of `ditaa`_, which isn't presently built
+Ceph documentation makes extensive use of `ditaa`_, which is not presently built
for CentOS/RHEL7. You must install ``ditaa`` if you are making changes to
``ditaa`` diagrams so that you can verify that they render properly before you
commit new or modified ``ditaa`` diagrams. You may retrieve compatible required
drive, but SSDs often exhibit access times that are at least 100x faster than a
hard disk drive.
-SSDs do not have moving mechanical parts so they aren't necessarily subject to
+SSDs do not have moving mechanical parts so they are not necessarily subject to
the same types of limitations as hard disk drives. SSDs do have significant
limitations though. When evaluating SSDs, it is important to consider the
performance of sequential reads and writes. An SSD that has 400MB/s sequential
</td><td><h3>Step 2: Storage Cluster</h3>
-Once you've completed your preflight checklist, you should be able to begin
+Once you have completed your preflight checklist, you should be able to begin
deploying a Ceph Storage Cluster.
.. toctree::