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List:       evms-devel
Subject:    Re: [Evms-devel] Re: BBR & RAID
From:       Kevin Corry <kevcorry () us ! ibm ! com>
Date:       2004-02-25 15:07:43
Message-ID: 200402250907.43043.kevcorry () us ! ibm ! com
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On Wednesday 25 February 2004 1:25 am, Jan Vittrup Hansen wrote:
> Thank you for your response!
>
>  I admire the documentation work done, and have indeed already read the
> pieces you referred me to. However, I am still clueless to these
> question.
>
>  A) Is it is enough to add a BBR segment to have the BBR functionality

Yes.

>  B) or should I also add a "feature object"

No. And creation of BBR feature objects will be removed in the next release.

>  C) and should I on top of that run "badbloks"?

Either way, but hopefully unnecessary. The "badblocks" tools is specific to 
ext2/3 filesystems, and is a one-time check. If that tool reports badblocks, 
you can feed the output to mkfs.ext2 so the filesystem knows to simply avoid 
those blocks. In contrast, the EVMS BBR plugins are constantly monitoring for 
bad-blocks, and will create new remappings on the fly if necessary.

>  My worry is that the GUI does not warn me of what I have done is
> stupid, and end up with three layers badblock relocation logic working
> against each other.

It would be very tough to add such warnings to the UIs. Each plugin in EVMS is 
an independent module, and the UIs have no knowledge of their capabilities, 
nor which combination of plugins are useful or counter-productive. What we 
really need to do is add some documentation on example setups that are 
beneficial for particular environments.

>  Btw; my ext3 format + badblocks is now running on 36hours+. Does
> anybody know how long I should expect it to take in this scenario?

The running time is obviously going to depend on the size of the volume, but 
I'd venture to say something is wrong with that particular run (unless you've 
plugged a 2TB array into a 486). I'd restart without the badblock check.

-- 
Kevin Corry
kevcorry@us.ibm.com
http://evms.sourceforge.net/


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