Serial attached scsi symbol
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A fourth generation with On the one hand , the terminators typical of parallel SCSI , which avoid signal reflection at the cable ends, are no longer necessary. The SAS standard provides three protocols higher up in the protocol stack to enable device communication:. SAS is not only designed as a connection protocol between the controller and end devices, but also allows a storage domain to be set up from SAS devices with the help of so-called "expanders".
These devices have a similar function to the switches known from the network world. A distinction is made between two types of expander:. Or you can use it for dual porting , which allows the two ports of the hard drive to be connected to different host adapters. This makes it easy to implement redundant architectures.
This pattern makes it easy to keep track of each stack. IDs must be unique within an HA pair. Both numbers blink and the operator display panel fault LED illuminates in about five seconds. IOM B is either on the bottom or on the right depending on your disk shelf model. These instructions use two quad SAS adapter cards in slots 11 and If your SAS cards are in different slots, adjust the port numbers for the slots actually used.
For two stacks of disks, you do not use two ports on each card. However you still need two cards to avoid a single point of failure. Before you begin.
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