[sclug] spare Linux HDD?

[Ian Park]

David Given wrote:
 > Excellent --- I didn't even know they still made MMC cards!

 > Now I should be able to replace my 2GB SD card with a 4GB MMC card,
 > neatly sidestepping the SDHC bug. It's a pity you can't get 8GB MMC
 > cards.

 > Incidentally --- would you mind doing a 'hdparm -t -T' on it, just to
 > get a benchmark?
--
Sure - for the MMC card (sdb), I did a couple of runs, and got:
For cached reads, 246 MB in 2.00 seconds = 122.96 MB/sec and 374 MB in 
2.00 seconds = 186.60 MB/sec
For buffered disk reads, 38 MB in 3.14 seconds = 12.10 MB/sec (both times).

By way of a comparison, I tried the same with the internal flash card, 
and got:

For cached reads, 268 MB in 2.00 seconds = 133.92 MB/sec and 266 MB in 
2.00 seconds = 132.72 MB/sec
For buffered disk reads, 44 MB in 3.15 seconds = 13.97 MB/sec and 56 MB 
in 3.10 seconds = 18.08 MB/sec

No, I can't explain the markedly different speeds for cached reads from 
sdb on the two runs, or for buffered reads from sda on the two runs!

Cheers

Ian
-- 
Ian Park
17 Pyle Hill
Newbury
Berkshire
RG14 7JJ
Tel: +44 (0)1635 821420
GSM: +44 (0)7785 300290
email: ian at chalmers-park.name
--