Topic
  • 1 reply
  • Latest Post - ‏2013-01-16T14:02:52Z by DaveQ
SystemAdmin
SystemAdmin
9111 Posts

Pinned topic mist size on RAID5

‏2013-01-16T11:08:00Z |
Dear All,
I just purchase IBM x3650 7945 with 600 GB SAS * 3 then I configured those with RAID5 with integrated controller but I'm wondering why the size of those 3 SAS size only can be configured for 1 TB not 1,8 TB any mistake I done while configured the RAID

Thank you and regards,

Muhidin
Updated on 2013-01-16T14:02:52Z at 2013-01-16T14:02:52Z by DaveQ
  • DaveQ
    DaveQ
    132 Posts

    Re: mist size on RAID5

    ‏2013-01-16T14:02:52Z  
    Hi,

    This is due to the way RAID 5 works. RAID 5 is the size of each drive multiplied by the number of drives in the array, minus the capacity of one drive.

    So, if you have 3 x 600GB in a RAID 5, the maximum logical volume size can be 1.2TB.

    The only way you can have 1.8TB with 3 x 600GB drives is if you used RAID 0 (stripe), though that doesn't offer any redundancy.