Even without 12Gb/s drives
This is good for dealing with saturation of SAS-X4 links between arrays.
Xyratex is plotting to build a drive array with doubled SAS interface speed using LSI 12Gbit/s SAS gear. SAS – or Serial-Attached SCSI (Small Computer System Interface) – is a way of linking storage media and controllers/servers that is enterprise class but without the complexities of Fibre Channel. First generation SAS runs …
FC can be point-to-point or switched.
SAS can be point-to-point only.
Less complexity, huge difference in capabilities. But in fact, nobody uses FC for point-to-point any more. There's no point [/coat].
Wake me up when someone develops a SAS fabric (SAS over E-Pcie does not count).
FC is already up to at least 16Gb/s now, so it's still ahead of 12Gb/s SAS. That and most HBAs are dual-port, so double that speed.
IB is interesting (when it works!), but there isn't a whole lot of top tier IB storage vendors. Sure, there are bottom-tier vendors that'll sell you an IB NAS, but IB SAN is almost impossible find. Most of it is ZFS based exporting ZVOLs or Linux machines exporting block devices.
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