Shown in this image are three Ultra320 SCSI hard disk drives that are located in one of our retired servers. SAS hard disk drives are
becoming more widely used than these types of drives nowadays.
A similar retention mechanism is used for 3.5-inch drives â press the maroon latch pull the handle and remove the drive.
This image shows a low-cost (relative to enterprise standards) external storage array. Towards the bottom of the image you can see
redundant array controllers which manage the three shelves of storage above. The shelves are populated with FATA disks which are essentially SATA drives with fibre-channel converters. We use this array for backup purposes hence why (comparatively) low-cost FATA disks were used in this array.
A close-up of the array shelves. Each shelf can contain 14 drives and each 3.5-inch drive is hot-swappable
via a similar latch-and-handle design that is seen on 2.5-inch drives. Three LED’s are also present on each drive indicating the status of
each individual drive.
The back of the three shelves of storage. Each shelf features redundant power supplies and redundant fibre loop connectivity back to the controllers (you can see these loop cables on either side of the power supplies). The power supplies also feature redundant fan pairs (one is installed in front of the other).
The back of the two array controllers. Only one controller is required for operation but the second controller is installed for fault-tolerance. Each controller has two fibre-channel ports each of which connects to a different fibre channel switch (again for redundancy one of these switches can be seen underneath the lower controller). Each controller also has redundant power supplies.
Each server that needs to have access to logical disks in the array needs to have a fibre-channel connection to one or both of the fibre-channel switches (this choice is made depending on the level of fault tolerance required). This video encoding server has a single connection to one switch and is currently running at 2Gb/s.
Next: Managing the cables