Raid 1 to Raid5 (soft) in OVH

only used SoYouStart partition manager once ever so not familiar with it and it looks different from my SoYouStart one so not sure.. but raid levels are set per disk device partition you create and not for whole disks

for my SoYouStart looked like this for raid 1 with a raid 0 fastdisk partition

 

just keep reinstall CentOS 6.6 OS from OVH dashboard changing the default partitioning at install time until you get what you want

 

not sure i understand, SoYouStart partition manager at CentOS 6.x OS reload/reinstall time has partition manager to size and set raid levels prior to install. I assume OVH one also has such

 

you should be able to resize partitions at partition creation time

 

There should be a check box for custom install on reinstalls - at least there is for SoYouStart.

Actually, just discovered SoYouStart has a Manage Template Installations where you can predefine your OS to install as well as it partition setup either as default or new custom. I just recreated my raid 0 partition scheme on a new Installation Template which you select from reinstall list of OSses



selecting my custom raid 0 partition scheme which I created when I created my CentOS 6.6 raid template


the default partition layout

the raid 0 partition layout I created

now when you go to reinstall OS, I just select that custom Installation Template I created

 

FYI, requirement of software raid is / and /boot need to be raid 1 partitions at least everything else can be set to your desired raid levels

 

that looks right for raid 5 with 3x160GB SSD disks

Centmin Mod .07 stable install takes care of /tmp on tmpfs ramdisk while this has changed and improved on Centmin Mod .08 beta where install automatically determines if /tmp is on ram disk tmpfs or on disk according to how much memory you have. Full outline here and actual code in .08 beta on lines 653 to 689 of centmin.sh

Code:

    # only mount /tmp on tmpfs if CentOS system
    # total memory size is greater than 8GB
    # will give /tmp a size equal to 1/2 total memory
    if [[ "$TOTALMEM" -ge '8000000' ]]; then
       rm -rf /tmp
       mkdir -p /tmp
       mount -t tmpfs -o rw,noexec,nosuid tmpfs /tmp
       chmod 1777 /tmp
       echo "tmpfs /tmp tmpfs rw,noexec,nosuid 0 0" >> /etc/fstab
       rm -rf /var/tmp
       ln -s /tmp /var/tmp
    elif [[ "$TOTALMEM" -ge '2000000' || "$TOTALMEM" -lt '8000000' ]]; then
       # set on disk non-tmpfs /tmp to 4GB size
       # if total memory is between 2GB and <8GB
       rm -rf /tmp
       dd if=/dev/zero of=/home/usertmp_donotdelete bs=1024 count=4000000
       echo Y | mkfs.ext4 /home/usertmp_donotdelete
       mkdir -p /tmp
       mount -t ext4 -o rw,noexec,nosuid /home/usertmp_donotdelete /tmp
       chmod 1777 /tmp
       echo "/home/usertmp_donotdelete /tmp ext4 rw,noexec,nosuid 0 0" >> /etc/fstab
       rm -rf /var/tmp
       ln -s /tmp /var/tmp
    elif [[ "$TOTALMEM" -le '2000000' ]]; then
       # set on disk non-tmpfs /tmp to 2GB size
       # if total memory is <2GB
       rm -rf /tmp
       dd if=/dev/zero of=/home/usertmp_donotdelete bs=1024 count=2000000
       echo Y | mkfs.ext4 /home/usertmp_donotdelete
       mkdir -p /tmp
       mount -t ext4 -o rw,noexec,nosuid /home/usertmp_donotdelete /tmp
       chmod 1777 /tmp
       echo "/home/usertmp_donotdelete /tmp ext4 rw,noexec,nosuid 0 0" >> /etc/fstab
       rm -rf /var/tmp
       ln -s /tmp /var/tmp
    fi
fi

As to recommended partition, you have to be careful as Centmin Mod as well as CentOS system itself has a number of directories and files located at root / if you are partitioning using a single root / partition

• /svr-setup where all Centmin Mod source tarballs, rpms for repos, are saved to which over time can grow to 3-5+GB (I should really come up with a way to clean older files in next release)
• /var/log where system and nginx, php-fpm, mariadb mysql logs are located which can grow
• /var/lib/mysql where mariadb mysql data resides

You'll have come up with the optimal partition size and setup for your intended usage loads and requirements though as there isn't a real general partition setup that would work for everyone.

 

raid 1 will take disk space from each of your 3x 160GB,

so 20GB raid 1 partition takes 20GB x3 disks = 60GB and 512MB raid 1 swap = 512MBx3 = 1.5GB

As 160GB formatted capacity is ~146GB, meaning each disk has 146-20-1.5 = 124.5GB of space left. So potentially for raid 5, you have 2x124.5GB = 249GB

 

Well you can take care of /svr-setup by moving the directory to say /home/svr-setup and edit the main DIR_TMP variable in centmin.sh to point to /home/svr-setup as per Install - svr-setup directory | Centmin Mod Community

but /var really depends on how your intended apps and software utilise it and their sizing requirements for logs.

you could make / smaller and set dedicated /var and /svr-setup partitions on EXT4 as raid 5 instead too