Re: Competition for OraPerf

Charles Hooper wrote:
> Is flash (drive) memory synonymous with SSD? Flash drive memory,
> riding in a USB2 slot is not fast, especially when compared with a RAID
> controller with 256MB or more cache memory that is connected to a PCI
> Express bus. Compare the burst and throughput of a 6, 8, 10, 12, or
> more drive RAID 10 array with the performance of one of these 8GB flash
> drive:
> http://www.pcmall.com/pcmall/shop/detail~dpno~7036586.asp
>
> >From that website:
> "Speed: Read 8M bit/sec, Write 6.4M bit/sec (Max)"
> Read speed on this 8MB flah drive is 1MB per second maximum, and write
> speed is 0.8MB per second maximum. Flash drives are also prone to
> corruption.
>
> I am hoping that flash drives and SSD are not one in the same. My bet
> is that SSD plugs into an internal PCI slot and is essentially battery
> backed RAM. While fast, it would still be constrained to the maximum
> speed of the PCI bus, which is likely shared with several other
> devices, possibly the hard drive RAID controller. If this is the case,
> the addition of the SSD device could slow the maximum throughput of the
> hard drive RAID controller as it must now compete on the PCI bus with
> the SSD. This of course leads to the question, could adding an SSD
> device slow performance? Some servers with PCI buses actually have two
> independent PCI buses, so maybe this is not a concern.
>
> Charles Hooper
> PC Support Specialist
> K&M Machine-Fabricating, Inc.

Correction: The line reading "Read speed on this 8MB flah drive is 1MB per second maximum"

Should appear as: "Read speed on this 8GB flash drive is 1MB per second maximum"

Charles Hooper
PC Support Specialist
K&M Machine-Fabricating, Inc. Received on Sun Nov 05 2006 - 20:51:18 CST