SCSI vs SATA? Is SCSI "actually" better?

Posted by earlz on Server Fault See other posts from Server Fault or by earlz
Published on 2009-12-30T21:06:42Z Indexed on 2010/06/12 1:03 UTC
Read the original article Hit count: 308

Filed under:

sata

|

sas

|

comparison

|

scsi

Well, I was talking with a guy about servers the other day. I was a bit shocked whenever I asked him if there was any significant difference between SCSI and SATA and why he always uses SCSI. (note, I'm not sure if by SCSI he meant SAS)

He told me that SCSI is always faster and that the drives are always more reliable.. I mean, this seems like a bold statement.

He told me something about how SCSI will always be faster than SATA because the OS sends the SCSI (controller?) a request to get a file and it will build the file inside of the SCSI controller, instead of searching all over the disk.. which I do not understand how that would work, so I figure it is BS.

SAS and SATA currently have equivalent data rate speeds..

Is there any true backing for his reasoning that SCSI is always faster and more reliable than SATA?

© Server Fault or respective owner

Related posts about sata

SATA vs SATA-II

as seen on Super User - Search for 'Super User'
Hi all, I'm looking to replace my hard disk, which is a Seagate Barracuda 7200.11 ST3500320AS 500GB. My friend told me to get a SATA HDD, not a SATA-II. What is the difference between the two? And is my old HDD a SATA or SATA-II? The new HDD I'm looking at is a Seagate 7200.12 ST3500418AS, which… >>> More
Desktop SATA drives in SATA <-> FC array

as seen on Server Fault - Search for 'Server Fault'
Let's assume you've got a box like one of these with space for 24 SATA disks. What are the best bits of advice for deploying this? For instance, should you be greedy and go for the 1.5 or 2tb disks or are they just not reliable enough to be used in an array like this and you should stick with 640gb… >>> More
SATA-II motherboard and drives but only connected at SATA-I

as seen on Super User - Search for 'Super User'
I have an Abit AB9 QuadGT motherboard which has a SATA-II controller. Connected to it I have a Kingston SSDNow V Series 64GB as boot drive and a Seagate Barracuda 7200.10 as a data drive. I also have 2 x Optiarc AD-7170S DVD burners attached by SATA. Both SSD and HDD are SATA-II and the optical… >>> More
SATA 300 mobo and drives but only connected at SATA 150

as seen on Super User - Search for 'Super User'
I have an Abit AB9 QuadGT motherboard which supports SATA 300 drives Connected to it I have a Kingston SSDNow V Series 64GB as boot drive and a Seagate Barracuda 7200.10 as a data drive. I also have 2 x Optiarc AD-7170S DVD burners attached by SATA Both SSD and HDD are SATA 300 and the optical… >>> More
MacBook Pro Late 2009 SATA Resets, Slowness

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
My MacBook Pro runs slower the longer it's on. I am getting kernel warnings. The resets correlate with AC power connects and disconnects. I don't know if the warnings do. (How do I tell?) Are these bus CRC errors? Or something else? Can this damage the drive or corrupt data? What is it seeing… >>> More

Related posts about sas

Scheduling of SAS generated codes in SAS DI studio to IBM TWS

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi Guys, I`m sure some you might have used both SAS DI studio and IBM TWS. Has anone managed to run codes generated in SAS DI studio in TWS scheduler , What are the kind of issues you have faced? And it would be great if you could suggest possible solutions >>> More
Tutoriel SAS : Lire des classeurs Excel 2007 avec SAS 9.1, par Stéphane Colas

as seen on Developper.com - Search for 'Developper.com'
Bonjour, Retrouvez ci-dessous notre dernier tutoriel SAS : Lire des classeurs Excel 2007 avec SAS 9.1, par Stéphane COLAS. N'hésitez pas à donner votre point de vue Bonne lecture ... >>> More
Livre SAS : Économétrie théorie et application sous SAS, par V. Delsart, A. Rys et N. Vaneecloo

as seen on Developper.com - Search for 'Developper.com'
Bonjour, J'ai eu le plaisir de lire pour vous Econométrie théorie et application sous SAS, de Virginie Delsart, Arnaud Rys et Nicolas Vaneecloo. N'hésitez pas à régair ou poser des questions si vous souhaitez davantage d'informations Bonne lecture... >>> More
SAS unifie la vision des risques pour les banques avec SAS Risk Management for Banking

as seen on Developper.com - Search for 'Developper.com'
SAS unifie la vision des risques pour les banques Avec SAS Risk Management for Banking SAS lance SAS Risk Management for Banking, une solution intégrée dédiée à la gestion des risques dans le secteur de la banque. Cette solution exploite les fonctionnalités de la plate-forme SAS Business Analytics… >>> More
SAS Expanders vs Direct Attached (SAS)?

as seen on Server Fault - Search for 'Server Fault'
I have a storage unit with 2 backplanes. One backplane holds 24 disks, one backplane holds 12 disks. Each backplane is independently connected to a SFF-8087 port (4 channel/12Gbit) to the raid card. Here is where my question really comes in. Can or how easily can a backplane be overloaded? … >>> More