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 at …
Even without 12Gb/s drives
This is good for dealing with saturation of SAS-X4 links between arrays.
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).
Here's a wakeup call
Hewlett-Packard have been OEMing the LSI technology shown here for a few years now.
Re: Here's a wakeup call
Half the industry OEM LSI's3Gb/s and 6Gb/s - 12Gb/s is very new.
The 12G chipset was only released a few months ago so I think you are misunderstanding what the discussion is about.
Re: What complexity?
Umm - google "sas switch". A whole range of switches and switched sas fabrics are available.
SAS is OK for simple systems, but it's no competitor to FC for large, enterprise computer centres. It simply lacks the connectivity, flexibility and switching capability.
Re: FC competitor?
Agreed. If there is any competitor that FC should look out for, it's Infiniband, not SAS.
Re: FC competitor?
or plain old Ethernet. as it's standard it tends to be cheaper, and currently you can easily and cheaply use 40gbe.
Not to mention distance
I have FC running between buildings. SAS won't match that anytime soon.
That said, 12GB/s is _still_ useful connecting array controllers to JBODS.
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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