![]() SSD technology uses electronic interfaces compatible with traditional block input/output (I/O) hard disk drives. Solid-State Drive (SSD): An SSD is a data storage device that uses integrated circuit assemblies as memory to store data persistently.These are the top end in performance for electromechanical drives. These have extra connections through the top of the SATA connection. SAS is a point-to-point serial protocol that replaces the older based parallel SCSI bus technology (SCSI). Serial Attached SCSI (SAS): SAS is a communication protocol used in Enterprise hard drives and tape drives.Basically it is a hybrid between SATA and SAS. This provides better performance and reliability over SATA. Near Line SAS: Near Line SAS are enterprise SATA drives with a SAS interface, head, media, and rotational speed of traditional enterprise-class SATA drives with the fully capable SAS interface typical for classic SAS drives.Cabled hard drives are not hot swappable. On smaller servers with a controller, they can still be cabled because these systems will not have a backplane. On some systems without a controller, these can be cabled instead to the onboard SATA connections on the motherboard. Serial ATA was designed to replace the older parallel ATA (PATA) standard (often called by the old name IDE), offering several advantages over the older interface: reduced cable size and cost (7 conductors instead of 40), native hot swapping, faster data transfer through higher signaling rates, and more efficient transfer through a I/O queuing protocol. Serial ATA (SATA): SATA drives are base hard drives in Dell PowerEdge servers.Example - plugging a 6Gb/s hard drive into a 3Gb/s backplane will result in the speed being 3Gb/s. In most cases, the higher specification is backwards compatible to the lowest common speed. In order to get the maximum speed the hard drive, backplane, cables, and controller all have to support the set rate. ![]() There is also transfer differences referred to as SATA 1, 2, or 3. In addition, the types cannot be mixed in the same RAID set. There are specific configuration limitations and the specifics should be checked for the type of controller used. There are four main types used in Dell 9th generation servers and up. This article provides information on understanding hard drive types, RAID and RAID Controllers on Dell PowerEdge and Blade Chassis Servers.ĭell PERC (PowerEdge RAID Controller) and other controllers can support a variety of hard drive types. ![]()
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