HansF wrote:
> On Sun, 05 Nov 2006 18:51:18 -0800, Charles Hooper wrote:
>
>> 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
>
> You will note that Mladen referred to "8GB flash disk like Ritek
> CFR8G-80X-G". That unit uses the CompactFlash specification ... the
> larger of the 'digital camera' removable cards. Fits in the universal
> card adapter that connects to the USB bus on my PC. I suspect you can get
> a variant of the adapter that fits in a PCI slot.
>
> He's absolutely correct - it's a solid state disk device. Admittedly not
> quite like the SCSI or IDE SSDs from M-Systems or SolidData, which are the
> more common interpretation of 'SSD' and still generally run in the $10K
> range last time I checked (about 2 months ago).
>
>
> And, theoretically the USB spec takes one up to very fast transfer rates.
> As long as one has USB 2, single device and no conflicts on the bus.
>
> And, under Linux the USB disk mounts as /dev/sda[0-9], so one could even
> use it as a raw device.
>
>
> I've found with the flash drives is that write speed tends to be a bit on
> the low side, even compared to read speed.
From my experience USB 2 is slow than GigE which I would interpret as
meaning that writing to the cache on a NetApp or EMC is going to be very
substantially faster. I don't know of too many people whose hardware
writes directly to disk anymore.
--
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org
Received on Mon Nov 06 2006 - 12:15:25 CST
