I have tried. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ volume writebehind type performance/write-behind option aggregate-size 8MB # default is 0bytes option flush-behind off # default is 'off' subvolumes unify0 end-volume ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [@123.25 ~]# dd if=/opt/xxx of=/mnt/xxx 100353+0 records in 100353+0 records out 51380736 bytes (51 MB) copied, 129.343 seconds, 397 kB/s [@123.25 ~]# dd if=/opt/xxx of=/mnt/xxx bs=16M 16+0 records in 16+0 records out 268435456 bytes (268 MB) copied, 23.5073 seconds, 11.4 MB/s [@123.25 ~]# dd if=/opt/xxx of=/mnt/xxx bs=2M 128+0 records in 128+0 records out 268435456 bytes (268 MB) copied, 23.4631 seconds, 11.4 MB/s [@123.25 ~]# dd if=/opt/xxx of=/mnt/xxx bs=1k 123905+0 records in 123905+0 records out 126878720 bytes (127 MB) copied, 54.4253 seconds, 2.3 MB/s [@123.25 ~]# dd if=/opt/xxx of=/mnt/xxx bs=16k 16384+0 records in 16384+0 records out 268435456 bytes (268 MB) copied, 23.6589 seconds, 11.3 MB/s -----Original Message----- From: anand.avati at gmail.com [mailto:anand.avati at gmail.com] On Behalf Of Anand Avati Sent: Saturday, December 06, 2008 2:24 AM To: Kirby Zhou Cc: a s p a s i a; gluster-users at gluster.org Subject: Re: Why so bad performance? Kirby, please try by loading write-behind xlator on the client side. avati 2008/12/5 Kirby Zhou <kirbyzhou at sohu-rd.com>: > OK, They are HP 380 G4 rack server boxes. > P4 Xeon 3.0GHz*2 with Hyper-Thread, 4G RAM. > scsi 72g*5 raid5 for /exports/ns, sata 250G*7*2 raid5 for /exports/disk1 and > /exports/disk2. > All of the 4 boxes are connected with gigabit Ethernet switcher. > 10.10.123.21 and 10.10.123.22 are servers, while 10.10.123.25 and > 10.10.65.64 are clients. >
