Asias He 32d5a81b73 ami: Improve scylla raid setup
Use all the disks except the one for rootfs for RAID0 which stores
scylla data. If only one disk is available warn the user since currently
our AMI's rootfs is not XFS.

[fedora@ip-172-31-39-189 ~]$ cat WARN.TXT
WARN: Scylla is not using XFS to store data. Performance will suffer.

Tested on AWS with 1 disk, 2 disks, 7 disk case.

(cherry picked from commit 49d6cba471)
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#Scylla

##Building Scylla

In addition to required packages by Seastar, the following packages are required by Scylla.

Submodules

Scylla uses submodules, so make sure you pull the submodules first by doing:

git submodule init
git submodule update --recursive

Building scylla on Fedora

Installing required packages:

sudo yum install yaml-cpp-devel lz4-devel zlib-devel snappy-devel jsoncpp-devel thrift-devel antlr3-tool antlr3-C++-devel libasan libubsan

Building Fedora RPM

As a pre-requisite, you need to install Mock on your machine:

# Install mock:
sudo yum install mock

# Add user to the "mock" group:
usermod -a -G mock $USER && newgrp mock

Then, to build an RPM, run:

./dist/redhat/build_rpm.sh

The built RPM is stored in /var/lib/mock/<configuration>/result directory. For example, on Fedora 21 mock reports the following:

INFO: Done(scylla-server-0.00-1.fc21.src.rpm) Config(default) 20 minutes 7 seconds
INFO: Results and/or logs in: /var/lib/mock/fedora-21-x86_64/result

Building Fedora-based Docker image

Build a Docker image with:

cd dist/docker
docker build -t <image-name> .

Run the image with:

docker run -i -t <image name>
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