Re: time limited error recovery and md raid

[Redeeman <redeeman@metanurb.dk>]

On Fri, 2008-12-05 at 16:01 -0500, Justin Piszcz wrote:
> 
> On Fri, 5 Dec 2008, Redeeman wrote:
> 
> > Hello..
> >
> > Im going to be building a software raid6 setup with probably 8 disks,
> > and i've been looking at the wd gp disks, which comes in both standard
> > and raid edition, with the raid edition being much more expensive.
> >
> > I have searched around, and found that it is indeed possible to activate
> > tler on the "normal" disks, however, the setting has a parameter, more
> > specifically, how many seconds it should be limited to. Default is 7.
> >
> > So i was wondering, what should that be set to, to be optimal for linux
> > md raid? i havent been able to find any information about this.
> >
> >
> > Thanks.
> >
> >
> > mvh.
> > Kasper Sandberg
> >
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> >
> 
> The exact time is a good question.

About this, shouldnt it be possible to find the exact time which the
linux raid system waits until it auto kicks out the drive?


> 
> Something I have noticed is when TLER is off, the drives hang up when they 
> hit a bad sector and when TLER is on, the drives is kicked out of the 
> array immediately when it reports a bad sector.

On further thought, might this not suggest that the linux raid system
waits indefinetly for I/O error, before kicking out?

If that is indeed the case, then if the use of the raid isnt
time-critical, then maybe its a good thing to have tler enabled, just in
case the disk is able to fix stuff?

> 
> Justin.
> 
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