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Revision as of 09:19, 31 May 2014
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==Creating Large Raid5 Array using 4TB drives==
==Creating Large Raid5 Array using 4TB drives==
{{Note box|due to a limitations in kernel 2.6.18 which is the default kernel of Centos 5 and SME Server 8.0, you can not create Raid5 arrays from drives with a capacity of more than 2TB. This means that the largest size using the standard SME Server 8.0 install is limited to 7.2TB. You can overcome this by growing the array after you create array using the standard SME Server 8.0 install please follow [[Raid:Growing|Howto]]}}
{{Note box|due to a limitations in kernel 2.6.18 which is the default kernel of Centos 5 and SME Server 8.0, you can not create Raid5 arrays from drives with a capacity of more than 2TB. This means that the largest size using the standard SME Server 8.0 install is limited to 7.2TB. For those that have and existing array of 7.2TB and need more space you can growing your existing array please follow [[Raid:Growing|Howto]]}}
In the howto below we will be creating an array using 6x 4TB drives to create a new Raid5 array of 19TB in capacity. Below is the basic hardware details of the computer that were used, these are only a guide.<br>
Large case capable of fitting 12 drives - Gigabyte 3D Aurora<br>
Main board with 6 SATA 3 ports on board - Gigabyte GA-970A-D3<br>
SATA Controller 4 SATA 3 ports on board - Rocket R640L<br>
6x 4TB Hard disk drives - 19TB Array<br>
1x 500MB Hard disk drive - SME Server 8.0 operating system<br>
When new disks are added, existing raid partitions can be grown to use the new disks. After the new disk has been partitioned, the RAID array 1/4/5 may be grown. Assuming that before growing, it contains four drives in Raid5 and therefore an array of 3 drives (3*10G) and 1 spare drive(10G). See this [[Raid#Hard_Drives_.E2.80.93_Raid|HowTo]] for understanding the automatic raid construction of SME Server
When new disks are added, existing raid partitions can be grown to use the new disks. After the new disk has been partitioned, the RAID array 1/4/5 may be grown. Assuming that before growing, it contains four drives in Raid5 and therefore an array of 3 drives (3*10G) and 1 spare drive(10G). See this [[Raid#Hard_Drives_.E2.80.93_Raid|HowTo]] for understanding the automatic raid construction of SME Server
