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Re: Anyone using XFS in production on > 20TiB volumes?

To: Chris Wedgwood <cw@xxxxxxxx>
Subject: Re: Anyone using XFS in production on > 20TiB volumes?
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Wed, 22 Dec 2010 14:24:23 -0500 (EST)
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20101222185005.GB30073@xxxxxxxxxxxxxxxxxx>
References: <alpine.DEB.2.00.1012221128440.5245@xxxxxxxxxxxxxxxx> <20101222170620.GA29117@xxxxxxxxxxxxxxxxxx> <alpine.DEB.2.00.1012221209150.5245@xxxxxxxxxxxxxxxx> <20101222173209.GA29291@xxxxxxxxxxxxxxxxxx> <alpine.DEB.2.00.1012221234310.5245@xxxxxxxxxxxxxxxx> <20101222185005.GB30073@xxxxxxxxxxxxxxxxxx>
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

On Wed, 22 Dec 2010, Chris Wedgwood wrote:

On Wed, Dec 22, 2010 at 12:35:46PM -0500, Justin Piszcz wrote:

Is this by specifying the sunit/swidth?


Can you elaborate on which paramters you modified?

i set both to match what the hw raid was doing, the lru that is my
brain doesn't have the detail anymore sorry

at a guess it was probably something like 64k chunk, 20 devices wide

the metadata performance difference between wrong and right is quite

Yes and have it set to perform(ance).

be sure you have a bbu, there is a setting for force wc --- i wouldn't
do that

i would have it wc when the battery is good automatically disable it
when it's bad

i was able to buffer ~490MB of writes in the card without trying hard,
that's a lot of pain to get corrupted

Going to be using 19HDD x 3TB Hiatchi 7200RPMs, (18HDD RAID-6 + 1
hot spare).

are those 4k sector drives?  i ask because it's not clear if/how the
raid fw deals with these

Hi, they are 512 byte sector drives.

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