Ik begin hoe langer hoe meer te denken dat dit een groot drama-moederbord is:
Over de EZ-Backup (Silicon Image controller) performance:
Uit:
http://www.howtofixcomputers.com/bb/ftopic206270.html
"But the product briefing addresses the performance level of the SIl4723,
without the "intuitions" of the Wizard.
http://www.siliconimage.c...%20Prod%20Brief_FINAL.pdf
On page 2 it says:
"Max. performance greater than 110MBps (RAID 0)"
So the hardware processor inside the SIL4723, seems to be limiting
the striped performance level.
Raid 0 is striping, and if you had two ordinary drives, the
drives could sustain about 60MB/sec each. Two drives should
be giving 120MB/sec. The hardware processor inside the SIL4723
is limiting the performance level to 110MB/sec, which is
roughly what you'd get from a PCI bus mounted controller.
Basically, all it means in practical terms, is the Ezbackup
will not be giving any big advantage when bursting to the
caches on the disk drives. The burst and sustained transfer
rates will be about the same.
Since the above Product Briefing does not address performance
in RAID 1, it is hard to guess how that performance might
be limited. The drive itself would limit sustained performance
to 60MB/sec, while bursts to the cache on the hard disk
controller could be faster than that, but presumably the
hardware processor has its part to play in the performance
level as well.
The "3 Gb" speed of a SATA drive only gets used when bursting
small amounts of data to the hard drive cache memory. Once
the quantity of data is large enough, the drive performance
is limited by the media (head) rate, which for many cheap
drives is going to be in the 60MB/sec range. In such a situation,
there is precious little difference between a 150MB/sec max
and a 300MB/sec max cable transfer rate, if the poor disk drive
heads cannot go faster than 60MB/sec. When transferring a 1GB
file from one drive to another, you get the 60MB/sec figure,
and not something closer to the max cable rate. And even the
old ribbon cable transfer method could do 60MB/sec without
working up a sweat."
Ik heb die EZ-Backup eens geinstalleerd en gedraaid op 2 WD740GD Raptors in RAID0 maar je kan op je array niet eens de striping instellen!