Please inform the parameters you use in fstab
when you mount your NFS share.
Something like this:
<server>:/<share>
<mountpoint> nfs rsize=8192, wsize=8192, timeo=14, intr, tcp, bg, rw, bg,
hard, nointr, rsize=32768, wsize=32768, tcp, actimeo=0, vers=3,timeo=600
Emerson
-----Original Message-----
From:
xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Geoff Galitz
Sent: Tuesday, September 14, 2010
11:04 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] IOwaits over
NFS
Hello.
We have a number of Xen 3.4.2. boxes which have constant iowaits at around
10% with spikes up to 100% when accessing data over NFS. We have been
unable to nail down the issue. Any advice?
System info:
release
: 2.6.18-194.3.1.el5xen
version
: #1 SMP Thu May 13 13:49:53 EDT 2010
machine
: x86_64
nr_cpus
: 16
nr_nodes
: 1
cores_per_socket : 4
threads_per_core : 2
cpu_mhz
: 2261
hw_caps
:
bfebfbff:28100800:00000000:00000340:009ce3bd:00000000:00000001:00000000
virt_caps
: hvm
total_memory :
32758
free_memory :
3974
node_to_cpu :
node0:0-15
node_to_memory : node0:3974
xen_major
: 3
xen_minor
: 4
xen_extra
: .2
xen_caps
: xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler : credit
xen_pagesize : 4096
platform_params : virt_start=0xffff800000000000
xen_changeset :
unavailable
cc_compiler :
gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)
cc_compile_by : root
cc_compile_domain : gitco.tld
cc_compile_date : Wed Nov 11 21:16:28
CET 2009
xend_config_format : 4
And lsmod from a VM:
Module
Size Used by
nfsd
284041 17
exportfs
38849 1 nfsd
auth_rpcgss
81889 1 nfsd
ipv6
424737 24
xfrm_nalgo
43333 1 ipv6
crypto_api
42945 1 xfrm_nalgo
i2c_dev
43849 0
i2c_core
56129 1 i2c_dev
nfs
289549 1
lockd
99185 3 nfsd,nfs
fscache
52385 1 nfs
nfs_acl
36673 2 nfsd,nfs
sunrpc
197513 18 nfsd,auth_rpcgss,nfs,lockd,nfs_acl
iptable_filter 36161 1
ip_tables
55329 1 iptable_filter
x_tables
50377 1 ip_tables
dm_mirror
54345 0
dm_multipath
55385 0
scsi_dh
41665 1 dm_multipath
scsi_mod
197337 1 scsi_dh
parport_pc
62313 0
lp
47121 0
parport
73293 2 parport_pc,lp
pcspkr
36289 0
xennet
61129 0 [permanent]
dm_raid45
98897 0
dm_message
36161 1 dm_raid45
dm_region_hash 46401 1
dm_raid45
dm_log
44993 3 dm_mirror,dm_raid45,dm_region_hash
dm_mod
100753 4 dm_mirror,dm_multipath,dm_raid45,dm_log
dm_mem_cache
39617 1 dm_raid45
ext3
168529 1
jbd
94257 1 ext3
uhci_hcd
57561 0
ohci_hcd
56053 0
ehci_hcd
65869 0
xenblk
50729 1
