Simon,
You should definitely set it to high on the command line to increase the
speed of reconstruction. That is provided that your system is not being used
very heavily. If there are lots of other disk traffic and you set it to high
it will probably slows down the other activities.
I did not know that filerview sets it to the inverse so that's good to know.
Derek
-----Original Message-----
From: Simon Ferrett [mailto:simon@musicmatch.com]
Sent: Friday, September 10, 2004 10:25 AM
To: toasters(a)mathworks.com
Subject: RE: Raid reconstruct speed & simultaneous reconstructs
Interesting you mention the raid.reconstruct.perf_impact setting - I was a
little confused about its real meaning...
I thought (as you mentioned) that setting it to 'high' would increase the
reconstruct speed. I then used the filerview web interface to go in and
change the raid reconstruct speed to 'high' and it actually set this value
to 'low' - the web tool seems to set it to the inverse of what you'd expect.
(setting 'low' on the web interface sets this option to 'high' etc.)
So I was a little curious as to if the setting had a different meaning than
the one you (and I) initially thought it meant. (eg: perhaps it's meaning
impact on reconstruct speed rather than system performance, so 'low' means
the least affect on reconstruct speed and therefore the most impact on
system performance) I left it at 'low' since I figured the web interface
probably knew the meaning of the option a little more than I did...
Simon.
-----Original Message-----
From: Hill, Aaron [mailto:aaron.hill@cba.com.au]
Sent: Friday, September 10, 2004 1:53 AM
To: Simon Ferrett; toasters(a)mathworks.com
Subject: RE: New Simplified Monitoring Tool
Simon,
I don't know if you can directly increase the no. of simultaneous
reconstructs. However, you may be able to improve the speed marginally by
using the raid.reconstruct.perf_impact option and setting to high. However,
if your cpu's are already maxxed it probably won't make a lick of
difference.
---
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