tunefs parameters for swallow / eagle on DCC?

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1 total messages Started by Jef Poskanzer Sat, 18 Nov 1989 05:40

#184

Author: Jef Poskanzer
Date: Sat, 18 Nov 1989 05:40

29 lines
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We have a Balance-8 with two Swallow drives and three Eagle drives
running off the DCC.  The filesystems have never been tuned, so last
night during some scheduled downtime I did a little playing around with
tunefs and write/read timings.  Here's the data I took for the Swallows:

KB/s	rotdel	0	1	2	3	4	5	6
maxcont
1		394	469	466	458	464	560	560
2		395	459	465	457	460	448	453
3		406	450	391	393	433	414	421
4		393	125	151	157	361	410	404

8		386	404	399	401	409	394	398

32767		376	467	474	467	468	575	585

I didn't get as much data for the Eagles, but what I did get has the
same shape as the above.  It looks like I need to explore higher
rotdelays, which surprises me, and higher maxcontigs, which doesn't
surprise me.

Has anyone out there already done a thorough tune-up for Swallows
or Eagles?  I'd be interested in hearing what parameters you settled
on.
---
Jef

      Jef Poskanzer  jef@well.sf.ca.us  {ucbvax, apple, hplabs}!well!jef
         "It's the end of the world as we know it, and I feel fine."

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