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Re: file streams allocator behavior

To: Richard Scobie <r.scobie@xxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: file streams allocator behavior
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Sat, 25 Oct 2014 16:26:54 -0500
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <544BF26F.6000708@xxxxxxxxxxxx>
References: <544BF26F.6000708@xxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.7.0
On 10/25/2014 01:56 PM, Richard Scobie wrote:
> Stan Hoeppner said:
>> How can I disable or change the filestreams behavior so all files go
>> into the one AG for the single directory test?
> Hi Stan,
> Instead of mounting with -o filestreams, would using the chattr flag
> instead help?
> See
> http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch06s16.html

That won't help.  That turns it on (if it's not enabled by default these
days).  I need to turn off the behavior I'm seeing, whether it's due to
the filestreams allocator or default inode64.  Then again it may not be
possible to turn it off...

Anyone have other ideas on how to accomplish my goal?  Parallel writes
to a single AG on the outer platter edge vs the same to all AGs across
the entire platter?  I'm simply trying to demonstrate the differences in
aggregate bandwidth due to the extra seek latency of all AGs case.


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