Date: Sat, 14 Nov 2009 20:29:59 -0600
From: CyberLeo Kitsana cyber...@cyberleo.net
Subject: [FreeBSD Questions] Filesystem image as root
To: FreeBSD Questions freebsd-questions@freebsd.org
Cc: CyberLeo cyber...@cyberleo.net
Message-ID: 4aff67a7.6040...@cyberleo.net
Content-Type: text/plain; charset=ISO-8859-1
I have been thinking and experimenting for weeks, but I
cannot figure
this out.
I have an Intel SS4200 NAS that I wish to use as a ZFS NAS
with FreeBSD 8.0.
The device has 4 SATA bays, and I don't want to use one for
a UFS root disk.
I don't want to use up hundreds of megabytes of RAM
preloading an
mfsroot that can never shrink.
The single IDE connector is accessible via the legacy ISA
ports, and is
thus limited to PIO modes (about 1.6MB/sec max, even with
an actual hard
drive instead of a CF card).
You are off by an order of magnitude (base 2 or 10):
Pio mode 0 is ~3.3 MB/s
Pio mode 4 is ~16.7 MB/s
http://www.pcguide.com/ref/hdd/if/ide/modesPIO-c.html
You can probably set PIO mode 4 for with:
# atacontrol mode ad0 PIO4
I am currently using ~ 159MB on my root partition,
At 16.7MB/s that is a 10 second load time; and as you said, frequently used
files will be cached. (I have a CF card that has 15MB/s symmetric read/write.
Don't know how special it is.)
With a CF card there should be no seek delay of ~ 10 ms (for reads anyway,
deleting blocks probably takes 10ms).
Regards,
James Phillips
SNIPPED pivot_root attempt I can't help with.
My summary: maybe you are trying too hard :)
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