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| Netra Blade X3-2B (formerly Sun Netra X6270 M3 Server Module)
Because of the unique architecture of blade servers, there are a number of important things to keep in mind when configuring your disk sub-system. These include both drive type selection (SAS, SSD) and location of these drives in the blades. Disks that are internal on most blades are connected by a single port and run at a maximum speed of 3Gbs.
Disks located in storage modules are connected with two ports and run at a maximum speed of 6Gbs. Dual port drives provide additional fault tolerance that keep a drive online if the primary port fails. Currently SAS drives support two ports. SATA and SATA SSD drives are single ported.
In consideration of the differences between blades and drive types, you should take the following into account when configuring your system:
Virtual drives must be composed of drives using the same interface only (for example: SAS only).
Virtual drives must be contained in a single failure domain. The internal Netra Blade X3-2B disks are considered to be a single-failure domain (single-port connections only). One or more Sun Netra 6000 Storage Modules are also considered a single-failure domain. Any virtual drive created on the blade is limited to 4 drives, including the hot-spare drives. The number of virtual drives on Sun Netra 6000 Storage Modules can be up to eight or more drives, depending on the number of Sun Netra 6000 Storage Modules accessible to the blade.
Use dedicated hot-spares only. Do not use global hot-spares unless they cannot be accessed by another failure domain.
Dedicated hot-spares must only include drive groups that reside in the same failure domain. Using this method, you can create a “virtual” global hot-spare for any domain.
SATA/SATA-SSD drives are not supported in Sun Netra 6000 Storage Modules. The chassis Zone Manager does not allow you to zone the drives.
Only SAS drives are supported in Netra blades; however, if used in the blade, the SAS drives do not run at full speed and cannot utilize the second port.