On Fri, Feb 21, 2003 at 04:36:55PM +0100, Andrzej Wolski wrote:
>
> Witam,
>
> w czasie kopiowania pomiedzy dyskami obciazenie sytemu siega 99% i to
> niewazny czy dysk jest glownym systemu czy innym. Czy da sie to jakos
> zoptymalizowac?
>
> n# hdparm -Tt /dev/hdb2
>
> /dev/hdb2:
> Timing buffer-cache reads: 128 MB in 5.03 seconds = 25.45 MB/sec
> Timing buffered disk reads: 64 MB in 67.19 seconds =975.38 kB/sec
$ man hdparm
[...]
-m Get/set sector count for multiple sector I/O on the drive. A
setting of 0 disables this feature. Multiple sector mode (aka
IDE Block Mode), is a feature of most modern IDE hard drives,
permitting the transfer of multiple sectors per I/O interrupt,
rather than the usual one sector per interrupt. When this fea-
ture is enabled, it typically reduces operating system overhead
for disk I/O by 30-50%. On many systems, it also provides
increased data throughput of anywhere from 5% to 50%. Some
[...]
U mnie spadło do 0, chociaż szybciej wcale nie jest...
Marcin
--
Marcin Owsiany <[EMAIL PROTECTED]> http://marcin.owsiany.pl/
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