[Tig] removable storage disks / SATA

[Ramona Howard]

Bob,

> SAS and SATA-II are both 3Gbit links.  But SAS drives have more  
intelligence in the drives which makes them better for multi-threaded server 
use.

We are using multi-threading and SATA without issue :)
Although I am not arguing that SAS is not good.

> The key here is "years past".  The enterprise SCSI drives are of course 
faster now since they spin over twice as fast.  We have all  ncountered old 
SCSI drives since they usually just keep running without fail.

Years past was only a short time ago and we have had our share of 15k SCSI 
drives fail. SATA can now spin at 15K also but that really wasn't the point.  
The point is that reliability takes more than a trip to frys to buy a fast 
and or cheap drive.  Different products can deliver similar results both good 
and bad and if you don't have all the facts you could get burned. The price 
of a product shouldn't always be the only consideration nor should how it is 
traditionally used.

Otherwise a roll of duct tape would be a heck of a lot more, because it can 
hold really expensive things together really well :) Originated from military 
use it sure has been used on things it was not originally intended for and 
guess what, you can buy cheap duct tape and it sucks..............

> That is a key point.  If the storage is written a limited number of times, 
then FLASH storage makes sense as long as it is cost effective.

I think it is moving that direction. 

> Even though current SCSI/FC drives provide a bit-error rate about 10X better 
than typical SATA drives, they are clearly not cost effective for drives used 
only for "transport", as long as a backup copy is available.

typical SATA can be as reliable as IDE, something I would not recommend. The 
whole point,  SATA is not all equal and it's sometimes hard to find the 
difference, but it's there.

Solid State SATA may be something worth looking at as I know many are going 
down this route.

Cheers,
Ramona



-- 
Ramona Howard

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