On Mon, 8 Dec 2008, Redeeman wrote:
On Fri, 2008-12-05 at 18:52 -0500, Justin Piszcz wrote:
On Sat, 6 Dec 2008, Redeeman wrote:
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?
It times out after 1-2 minutes. I have been dealing with this for a very long
time, another 'symptom' is short smart tests taking forever when the disk is in
a soon-to-be failing state.
Do you know if this is actually caused by the disk's error recovery
timing out in 1-2 minutes, or the linux raid system?
I am not sure, that is a good question. I am not sure how long the drive
itself will spend 'searching' or trying to repair/read a bad sector with
TLER off vs. when the kernel will drop the disk for not responding.
Justin.
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