<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><br><br>thks a lot,i test it,and it work!<div><br></div><div>xiao li<br><br><br><div></div><div id="divNeteaseMailCard"></div><br><pre><br>在&nbsp;2012-11-06&nbsp;20:34:55，"Brian&nbsp;Foster"&nbsp;&lt;bfoster@redhat.com&gt;&nbsp;写道：

&gt;On&nbsp;11/05/2012&nbsp;08:38&nbsp;PM,&nbsp;肖力&nbsp;wrote:

&gt;&gt;&nbsp;I&nbsp;have&nbsp;4&nbsp;dell&nbsp;2970&nbsp;server&nbsp;,&nbsp;three&nbsp;server&nbsp;&nbsp;harddisk&nbsp;is&nbsp;146Gx6&nbsp;,one&nbsp;hard

&gt;&gt;&nbsp;disk&nbsp;is&nbsp;72Gx6:

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;each&nbsp;server&nbsp;mount&nbsp;info&nbsp;is

&gt;&gt;&nbsp;//dev/sda4&nbsp;on&nbsp;/exp1&nbsp;type&nbsp;xfs&nbsp;(rw)/

&gt;&gt;&nbsp;//dev/sdb1&nbsp;on&nbsp;/exp2&nbsp;type&nbsp;xfs&nbsp;(rw)/

&gt;&gt;&nbsp;//dev/sdc1&nbsp;on&nbsp;/exp3&nbsp;type&nbsp;xfs&nbsp;(rw)/

&gt;&gt;&nbsp;//dev/sdd1&nbsp;on&nbsp;/exp4&nbsp;type&nbsp;xfs&nbsp;(rw)/

&gt;&gt;&nbsp;//dev/sde1&nbsp;on&nbsp;/exp5&nbsp;type&nbsp;xfs&nbsp;(rw)/

&gt;&gt;&nbsp;//dev/sdf1&nbsp;on&nbsp;/exp6&nbsp;type&nbsp;xfs&nbsp;(rw)/

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;I&nbsp;create&nbsp;a&nbsp;gluster&nbsp;volume&nbsp;&nbsp;have&nbsp;4&nbsp;stripe&nbsp;

&gt;&gt;&nbsp;/gluster&nbsp;volume&nbsp;create&nbsp;test-volume3&nbsp;stripe&nbsp;4&nbsp;transport&nbsp;tcp&nbsp;\/

&gt;&gt;&nbsp;/172.16.20.231:/exp4&nbsp;\/

&gt;&gt;&nbsp;/172.16.20.232:/exp4&nbsp;&nbsp;\/

&gt;&gt;&nbsp;/172.16.20.233:/exp4&nbsp;&nbsp;\/

&gt;&gt;&nbsp;/172.16.20.235:/exp4&nbsp;\/

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;then&nbsp;i&nbsp;mount&nbsp;volume&nbsp;on&nbsp;client&nbsp;172.16.20.230

&gt;&gt;&nbsp;/mount&nbsp;-t&nbsp;glusterfs&nbsp;192.168.106.231:/test-volume3&nbsp;/gfs3/

&gt;&gt;&nbsp;and&nbsp;i&nbsp;dd&nbsp;10G&nbsp;file&nbsp;in&nbsp;gfs3

&gt;&gt;&nbsp;/dd&nbsp;if=/dev/zero&nbsp;of=/gfs3/3&nbsp;bs=1M&nbsp;count=10240/

&gt;&gt;&nbsp;/10240+0&nbsp;records&nbsp;in/

&gt;&gt;&nbsp;/10240+0&nbsp;records&nbsp;out/

&gt;&gt;&nbsp;/10737418240&nbsp;bytes&nbsp;(11&nbsp;GB)&nbsp;copied,&nbsp;119.515&nbsp;s,&nbsp;89.8&nbsp;MB/s/

&gt;&gt;&nbsp;I&nbsp;am&nbsp;very&nbsp;confused&nbsp;about&nbsp;this

&gt;&gt;&nbsp;/[root@node231&nbsp;~]#&nbsp;du&nbsp;-hs&nbsp;/exp4/

&gt;&gt;&nbsp;/10G&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/exp4/

&gt;&gt;&nbsp;/[root@node232&nbsp;~]#&nbsp;du&nbsp;-hs&nbsp;/exp4/

&gt;&gt;&nbsp;/10G&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/exp4/

&gt;&gt;&nbsp;/[root@node233&nbsp;~]#&nbsp;du&nbsp;-hs&nbsp;/exp4/

&gt;&gt;&nbsp;/10G&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/exp4/

&gt;&gt;&nbsp;/[root@node235&nbsp;~]#&nbsp;du&nbsp;-hs&nbsp;/exp4/

&gt;&gt;&nbsp;/10G&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/exp4/

&gt;&gt;&nbsp;i&nbsp;*understand&nbsp;**Stripe&nbsp;4&nbsp;should&nbsp;hold&nbsp;1/4&nbsp;space&nbsp;on&nbsp;each&nbsp;brick,why&nbsp;is&nbsp;10G

&gt;&gt;&nbsp;on&nbsp;each&nbsp;brick?*

&gt;&gt;&nbsp;*can&nbsp;someon&nbsp;e&nbsp;explain&nbsp;it,think&nbsp;you.*

&gt;&gt;&nbsp;

&gt;

&gt;The&nbsp;default&nbsp;stripe&nbsp;data&nbsp;layout&nbsp;conflicts&nbsp;with&nbsp;XFS&nbsp;default&nbsp;speculative

&gt;preallocation&nbsp;behavior.&nbsp;XFS&nbsp;preallocates&nbsp;space&nbsp;beyond&nbsp;the&nbsp;end&nbsp;of&nbsp;files

&gt;and&nbsp;the&nbsp;stripe&nbsp;translator&nbsp;continuously&nbsp;seeks&nbsp;past&nbsp;this&nbsp;space,&nbsp;making&nbsp;it

&gt;permanent.

&gt;

&gt;You&nbsp;can&nbsp;address&nbsp;this&nbsp;by&nbsp;1.)&nbsp;enabling&nbsp;the&nbsp;cluster.stripe-coalesce

&gt;translator&nbsp;option&nbsp;in&nbsp;gluster&nbsp;or&nbsp;2.)&nbsp;setting&nbsp;the&nbsp;allocsize&nbsp;mount&nbsp;option

&gt;(i.e.,&nbsp;allocsize=128k)&nbsp;in&nbsp;XFS.&nbsp;Note&nbsp;that&nbsp;using&nbsp;the&nbsp;latter&nbsp;option&nbsp;will

&gt;increase&nbsp;the&nbsp;likelihood&nbsp;of&nbsp;fragmentation&nbsp;on&nbsp;the&nbsp;backend&nbsp;filesystem.

&gt;

&gt;Brian

&gt;

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;

&gt;&gt;&nbsp;_______________________________________________

&gt;&gt;&nbsp;Gluster-users&nbsp;mailing&nbsp;list

&gt;&gt;&nbsp;Gluster-users@gluster.org

&gt;&gt;&nbsp;http://supercolony.gluster.org/mailman/listinfo/gluster-users

&gt;&gt;&nbsp;

&gt;

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