Talk:Serial Attached SCSI

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[edit] Q + A

Q: It would be interesting to see even a short list of points about how SAS compares to SATA - what limitations each one has the the other doesn't?

A: As noted in the article, SATA is limited to direct-attached connection of ATA drives only and does not support SAS drives. SAS supports SATA drives (in fact, it uses the same internal narrow cables), a complex topology, a SCSI command set, and for SAS-native drives, a globally unique drive identifier. 70.162.144.181 02:46, 6 October 2006 (UTC) A: Sata does actually support port multipliers but only one level of them and only one initiator and relatively few ports. SAS allows for multiple initiators and networks of expanders. 21:46, 13 April 2008 (UTC)

Q: I'd like to see something about performance of SAS relative to SCSI or SATA or IDE. Probably best as a link out than directly here. Leodirac 23:46, 5 January 2007 (UTC)

Q: It would be nice if SAS Expanders/Fanouts were explained more thoroughly. IE What the devices look like and how they interact with the controller. More of a broad explanation and implementation rather then ultra technical. Diagram, pictures, etc.

Q: The article says that SAS is backward compatible with SATA. What does that mean exactly? A: Sata drives can be connected to a SAS system but not vice-versa. Plugwash (talk) 21:46, 13 April 2008 (UTC)

[edit] SAS vs parallel SCSI

Since parallel SCSI also support hot swap. I've remove the following line

--Sltan 05:48, 23 January 2007 (UTC)

[edit] Cleanup

There are references for this article but they do not follow Wikipedia's guideline for citing sources at WP:CITE. Ceros 04:15, 5 December 2006 (UTC)

[edit] SATA 1 and SATA 2?

In the article about SATA it can be read that SATA II shouldn't be confused with SATA/300. Which is said on www.sata-io.org (the ones who make the standard). So the comparsion between SATA and SAS maybe should be changed. Like NCQ is an "additional capability" as they say, nothing about that it should be in SATA/300. Aqualize 22:55, 5 February 2007 (UTC)

[edit] Photo

A Hershey's kiss for size comparison?


but they "are one of the most popular candies in the world". Yep, never heard of those before :)


Any chance someone could make a new photo and include a ruler in the picture to show the size/scale? One with metric and imperial would be nice :) It would be a little more useful than using a chocolate as the reference object. —Preceding unsigned comment added by 134.7.248.130 (talk) 05:18, 20 November 2007 (UTC)

[edit] is it ok?

List of SAS & SAS RAID controllers - in fact it is a commercial ad with prices, "buy" button etc., not a list. Is it ok in wikipedia.org? —Preceding unsigned comment added by 80.75.94.163 (talk) 12:33, 25 November 2007 (UTC)

[edit] drive identification

"SATA devices are uniquely identified by their port number connected to the Host bus adapter while SAS devices are uniquely identified by their World Wide Name (WWN)." so how are SATA drives within a SAS system identified? Plugwash (talk) 18:18, 12 April 2008 (UTC)

[edit] error in SAS layers diagram?

In the frame definition layer, I think "SPP transport layer" is a typo; it should be "SSP transport layer". At least I can't find a reasonable definition for SPP, whereas SSP is "Serial SCSI Protocol" :-). --klode (talk) 16:20, 20 May 2008 (UTC)

[edit] Usage / deployment?

I'd like to know what the common usage for SAS drives would be (mission-critical servers, mid-range servers, low-demand servers, etc.) I'd also like to see some numbers as to how many are out there, how many will be out there, etc. Will this technology eventually dominate all server applications? ---Ransom (--208.25.0.2 (talk) 15:56, 3 June 2008 (UTC))

Please read WP:FORUM, but the short answer is that SAS already has taken over all of the above. -- KelleyCook (talk) 16:22, 3 June 2008 (UTC)