CentOS 6.4 Installation On Dell R720

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Hi,

I am planning to install CentOS 6.4 on Dell R720 which has hardware raid card and 6 hard disk slots available.

I have planned with the below set up :-

*2 Hard disks configured in RAID 1 for installing OS
*
*4 Hard disks configured in RAID 10 for data drive.*

Please suggest and recommend if the above approach is correct and let me know if i am missing anything which is crucial to set up a production server. This server will host MySQL DB server.

Regards,

Kaushal

5 thoughts on - CentOS 6.4 Installation On Dell R720

  • What is the HDD size? For a base OS + MySQL server, a 4GB SATA Disk on Module (DoM) may be sufficient.

    Again, hopefully, you have sized these disks for sufficient space for the DB files, presuming you will mount this device on /var/lib/mysql.

    You may want to put /tmp, /var/tmp/, /var/log on separate partitions –
    1G, 1G, 3G, respectively. You can “steal” this kind of space by creating a LV on your RAID10 device and carving it up as above with the rest for your MySQL files.

    HTH,
    — Arun Khan

  • Is there any particular reason why you want to create two RAIDs?
    Creating one 6 Disk RAID-10 would give you better random IOPS which is useful for a DB System. You can still create two independent virtual disks in that case or use independent partitions/LVM volumes to separate OS from Data.

    Regards,
    Dennis

  • On Tue, Oct 8, 2013 at 3:45 PM, Dennis Jacobfeuerborn
    Hi Dennis

    Thanks for the reply and not sure i understand *”You can still create two independent virtual disks in that case”* Please explain.

    Regards,

    Kaushal

  • Hi Kaushal, I’m not that familiar with the Dell RAID tools but I know the PERC
    controllers they use are just rebranded LSI controllers. On an LSI controller you can go into the WebBIOS and define your drive configuration (i.e. create a RAID-10 using drivegroups and spans) and then define virtual disks on top of that. For example you can use 6*1TB
    disks to form a 3TB RAID-10 and then define a 20G virtual disk for the OS and use the remaining space for a data virtual disk.

    Back in the days there was no distinction between a RAID and a virtual disk. The RAID *was* the virtual disk. On modern controllers the definition of the RAID topology and the definition of virtual disks on top of that are usually two independent steps.

    Regards,
    Dennis

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