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Every new file goes into a new ag

To: <linux-xfs@xxxxxxxxxxx>
Subject: Every new file goes into a new ag
From: "Bub Thomas" <thomas.bub@xxxxxxxxxxx>
Date: Wed, 11 May 2005 16:46:33 +0200
Cc: "Braehler Uwe" <uwe.braehler@xxxxxxxxxxx>, "Lindenkreuz Morris" <morris.lindenkreuz@xxxxxxxxxxx>, "Waldschmidt Stefan" <stefan.waldschmidt@xxxxxxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
Thread-index: AcVWODmDQvoNCIe4T0y/OrhOzLCmAQ==
Thread-topic: Every new file goes into a new ag
Hi there,
I just got XFS running under RedHat EL 3.0.
Since I need high bandwidth for media playout, where in our case each
and every frame of a film image sequence is a new file, I need file
sequences being physically close to each other.
I'm struggling with the fact that consecutive files on a new filesystem
don't get consecutive inode numbers. It seems that every new file ends
up in a new ag.
Thus the read performance for consecutive files is very poor 
I tried it with two different kernels which are
2.4.21-27.0.2.EL.sgi9.i386 and 2.4.21-15.0.4.EL.sgi3.i38. with both the
effect is the same.
My filesystem is located on a JBOD array on 14 FC-2 disks with less then
2 TByte and the kernel config CONFIG_LBD not set.
The volume on the JBOD I use is made with LVM.
Any help welcome.
Thomas Bub

_____________________________________
Thomas Bub
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Phone:  +49-(0)-6150-104-147
Fax:    +49-(0)-6150-104-656
E-Mail: Thomas.Bub@xxxxxxxxxxx




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