thks a lot,i test it,and it work! xiao li ? 2012-11-06 20:34:55?"Brian Foster" <bfoster at redhat.com> ??? >On 11/05/2012 08:38 PM, ?? wrote: >> I have 4 dell 2970 server , three server harddisk is 146Gx6 ,one hard >> disk is 72Gx6: >> >> each server mount info is >> //dev/sda4 on /exp1 type xfs (rw)/ >> //dev/sdb1 on /exp2 type xfs (rw)/ >> //dev/sdc1 on /exp3 type xfs (rw)/ >> //dev/sdd1 on /exp4 type xfs (rw)/ >> //dev/sde1 on /exp5 type xfs (rw)/ >> //dev/sdf1 on /exp6 type xfs (rw)/ >> >> I create a gluster volume have 4 stripe >> /gluster volume create test-volume3 stripe 4 transport tcp \/ >> /172.16.20.231:/exp4 \/ >> /172.16.20.232:/exp4 \/ >> /172.16.20.233:/exp4 \/ >> /172.16.20.235:/exp4 \/ >> >> then i mount volume on client 172.16.20.230 >> /mount -t glusterfs 192.168.106.231:/test-volume3 /gfs3/ >> and i dd 10G file in gfs3 >> /dd if=/dev/zero of=/gfs3/3 bs=1M count=10240/ >> /10240+0 records in/ >> /10240+0 records out/ >> /10737418240 bytes (11 GB) copied, 119.515 s, 89.8 MB/s/ >> I am very confused about this >> /[root at node231 ~]# du -hs /exp4/ >> /10G /exp4/ >> /[root at node232 ~]# du -hs /exp4/ >> /10G /exp4/ >> /[root at node233 ~]# du -hs /exp4/ >> /10G /exp4/ >> /[root at node235 ~]# du -hs /exp4/ >> /10G /exp4/ >> i *understand **Stripe 4 should hold 1/4 space on each brick,why is 10G >> on each brick?* >> *can someon e explain it,think you.* >> > >The default stripe data layout conflicts with XFS default speculative >preallocation behavior. XFS preallocates space beyond the end of files >and the stripe translator continuously seeks past this space, making it >permanent. > >You can address this by 1.) enabling the cluster.stripe-coalesce >translator option in gluster or 2.) setting the allocsize mount option >(i.e., allocsize=128k) in XFS. Note that using the latter option will >increase the likelihood of fragmentation on the backend filesystem. > >Brian > >> >> >> >> >> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org >> http://supercolony.gluster.org/mailman/listinfo/gluster-users >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20121107/5cc35435/attachment.html>
