hi ,
i want to ask about the parameters used in mout command
i have two mount point want to ask about them :
/dev/sdf1 /ca1 ext4 noatime,barrier=0,data=writeback,commit=100 0 2
=================================================
1.1.1.2:/share/MD0_DATA/videocache /vi nfs rw,soft,intr,bg,nolock,rsize=8192,wsize=8192,udp 0 0
=======================
i mean does the mount command parameters may cacue slow performance if wasnt configured well ???


regards

Yes it may cause performance issues if miss configured, for more details about mount see the manual.
Regards

In first mounting ,

data=writeback , specify journaling method . In writeback only metadata gets stored in journal so definitely this will improve performance.

commit=100 , specify data and metadata get synced in every 100 second instead of every 5 sec, so again this is performance boost .


In 2nd mounting .

UDP protocol is in use for NFS data transfer and socket buffer size has been set to
rsize=8192 (Memory for read )
wsize=8192 (Memory allocated for write ). By default udp socket size allocated as per settings in /proc/sys/net/core/rmem_default and /proc/sys/net/core/wmem_default


Thanks

hi ,
great info ,
but how to measure my performance if my configured values are in the right valuse ??!!
i mean if i have 1 tera hardsik mount ast ext4 with the mount info as :
/dev/sdf1 /ca1 ext4 noatime,barrier=0,data=writeback,commit=100 0 2



is it good ??
my problem is ,
with the mounting above , i have some slow , i dont know if it is from mounting or not .
im using squid with centos server .

not sure if squid or mount issue !!!

wish to help me how to measure mount performance .

regarcds

You can use dd command

dd if=/dev/zero bs=1M count=1 of=/ca1

You you can see how much taken to write 1Mb data to /dev/sdf1

You can also use iozone tool for performance evalution.

Thanks