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What is a Serial Attached SCSI expander?

April 26, 2017attached expander SCSI serial

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What is a Serial Attached SCSI expander?

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Expanders are the key to Serial Attached SCSI’s remarkable scalability. Each of these low-cost switches enables up to 128 point-to-point connections to be made off a single HBA/enclosure, and a total of 16,384 SAS devices can be aggregated while preserving performance and reliability. By contrast, Parallel SCSI imposes a limit of fifteen devices per SCSI chain and severely limits total cable length.