Hello !
Please allow me to submit to you a question related to a system which
is a NFS v3 client for a Netapp server. The home directories are
NFS attached. The following behaviour occurs sometimes. The system
becomes very slow. The load average is increasing but the most
interesting observation is the increase of the %iowait. After
reboot the system is running well for many days, then the problem
occurs again.
Any idea ?
Thanks a lot !
Claude
kernel: 2.6.23.12-52.fc7 (Fedora 7)
"sar -q" output
07:00:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15
07:10:02 AM 0 443 0.86 0.56 0.36
07:20:01 AM 0 481 0.40 0.47 0.40
07:30:01 AM 0 514 0.77 0.62 0.48
07:40:01 AM 0 558 0.70 0.55 0.47
07:50:01 AM 0 556 0.48 0.56 0.52
08:00:01 AM 1 575 0.60 0.56 0.53
08:10:01 AM 1 585 0.60 0.58 0.54
08:20:01 AM 0 625 0.40 0.75 0.68
08:30:01 AM 1 636 1.15 1.10 0.88
08:40:01 AM 1 774 23.99 9.99 4.21
08:50:01 AM 3 718 7.47 11.15 7.75
09:00:01 AM 6 770 8.85 6.34 6.38
09:10:01 AM 6 824 19.37 15.57 10.67
09:20:01 AM 1 864 16.30 15.40 12.98
09:30:01 AM 4 917 14.73 16.66 15.00
09:40:01 AM 4 1003 34.09 24.82 19.48
09:50:01 AM 3 1050 26.25 26.58 23.02
10:00:02 AM 2 1109 27.68 29.40 26.46
10:10:01 AM 1 1086 22.35 25.97 26.53
Average: 1 489 3.52 3.19 2.68
10:15:58 AM LINUX RESTART
10:20:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15
10:30:01 AM 2 817 1.77 1.74 1.17
10:40:01 AM 0 902 1.35 1.65 1.39
10:50:01 AM 2 937 1.52 2.07 1.74
11:00:01 AM 1 932 1.74 1.56 1.58
11:10:01 AM 2 972 2.17 1.74 1.62
11:20:01 AM 1 1008 1.48 1.63 1.64
11:30:02 AM 1 1018 1.85 2.09 1.90
11:40:01 AM 7 1060 5.00 8.76 6.10
11:50:01 AM 1 1087 6.17 7.47 6.76
12:00:01 PM 2 1095 3.61 4.72 5.60
12:10:01 PM 9 1107 4.66 4.66 5.19
12:20:01 PM 4 1135 3.30 3.79 4.52
12:30:01 PM 5 1215 32.66 16.54 8.98
12:40:01 PM 5 1157 3.99 7.20 8.14
12:50:01 PM 2 1155 8.45 9.40 8.76
"sar -u" output
07:00:01 AM CPU %user %nice %system %iowait %steal
%idle
07:10:02 AM all 3.01 0.01 5.68 1.57 0.00
89.73
07:20:01 AM all 3.55 0.01 6.26 1.72 0.00
88.46
07:30:01 AM all 5.09 0.06 8.11 1.87 0.00
84.87
07:40:01 AM all 5.00 0.00 7.83 1.52 0.00
85.65
07:50:01 AM all 5.67 0.00 8.31 1.70 0.00
84.31
08:00:01 AM all 3.99 0.01 7.76 1.32 0.00
86.92
08:10:01 AM all 4.80 0.01 8.43 2.09 0.00
84.67
08:20:01 AM all 5.19 0.00 10.86 2.13 0.00
81.82
08:30:01 AM all 7.11 0.06 12.08 2.60 0.00
78.14
08:40:01 AM all 9.34 0.00 17.74 5.48 0.00
67.43
08:50:01 AM all 12.71 0.00 31.01 11.59 0.00
44.68
09:00:01 AM all 10.32 0.00 24.47 4.45 0.00
60.76
09:10:01 AM all 11.62 0.00 31.83 15.74 0.00
40.81
09:20:01 AM all 13.45 0.00 32.63 15.31 0.00
38.60
09:30:01 AM all 12.23 0.07 32.96 18.86 0.00
35.88
09:40:01 AM all 11.45 0.00 32.75 25.88 0.00
29.93
09:50:01 AM all 13.34 0.00 33.04 34.10 0.00
19.52
10:00:02 AM all 13.23 0.00 33.28 34.18 0.00
19.30
10:10:01 AM all 13.68 0.00 33.43 28.89 0.00
24.00
Average: all 4.00 0.02 8.18 3.70 0.00
84.09
10:15:58 AM LINUX RESTART
10:20:01 AM CPU %user %nice %system %iowait %steal
%idle
10:30:01 AM all 12.93 0.00 15.33 6.77 0.00
64.98
10:40:01 AM all 13.73 0.00 13.51 5.83 0.00
66.92
10:50:01 AM all 12.13 0.00 17.42 5.04 0.00
65.41
11:00:01 AM all 10.68 0.00 14.59 3.72 0.00
71.01
11:10:01 AM all 11.27 0.00 14.40 4.71 0.00
69.62
11:20:01 AM all 10.97 0.13 14.97 3.76 0.00
70.17
11:30:02 AM all 13.10 0.00 18.71 3.72 0.00
64.47
11:40:01 AM all 15.59 0.00 28.22 12.29 0.00
43.90
11:50:01 AM all 15.07 0.00 31.73 7.00 0.00
46.20
12:00:01 PM all 13.13 0.00 26.36 4.39 0.00
56.12
12:10:01 PM all 14.95 0.00 27.19 6.65 0.00
51.21
12:20:01 PM all 13.02 0.06 25.71 4.03 0.00
57.18
12:30:01 PM all 15.18 0.00 29.02 10.21 0.00
45.58
12:40:01 PM all 14.28 0.00 28.58 9.56 0.00
47.58
12:50:01 PM all 15.22 0.00 34.07 7.90 0.00
42.80
"mount" options:
(rw,rsize=32768,wsize=32768,nfsvers=3,tcp,hard,nointr,timeo=600,addr=102.103.104.105)
from "sysctl -a"
sunrpc.rpc_debug = 0
sunrpc.nfs_debug = 0
sunrpc.nfsd_debug = 0
sunrpc.nlm_debug = 0
sunrpc.udp_slot_table_entries = 16
sunrpc.tcp_slot_table_entries = 16
sunrpc.min_resvport = 665
sunrpc.max_resvport = 1023
fs.nfs.nlm_grace_period = 0
fs.nfs.nlm_timeout = 10
fs.nfs.nlm_udpport = 32769
fs.nfs.nlm_tcpport = 32803
fs.nfs.nsm_use_hostnames = 0
fs.nfs.nsm_local_state = 51
fs.nfs.nfs_callback_tcpport = 0
fs.nfs.idmap_cache_timeout = 600
fs.nfs.nfs_mountpoint_timeout = 500
fs.nfs.nfs_congestion_kb = 91328
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.ip_forward = 0
net.ipv4.ip_default_ttl = 64
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.ip_nonlocal_bind = 0
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_max_orphans = 32768
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.ipfrag_high_thresh = 262144
net.ipv4.ipfrag_low_thresh = 196608
net.ipv4.ip_dynaddr = 0
net.ipv4.ipfrag_time = 30
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_syncookies = 0
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.ip_local_port_range = 32768 61000
net.ipv4.icmp_echo_ignore_all = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.icmp_errors_use_inbound_ifaddr = 0
net.ipv4.route.min_delay = 2
net.ipv4.route.max_delay = 10
net.ipv4.route.gc_thresh = 32768
net.ipv4.route.max_size = 524288
net.ipv4.route.gc_min_interval = 0
net.ipv4.route.gc_min_interval_ms = 500
net.ipv4.route.gc_timeout = 300
net.ipv4.route.gc_interval = 60
net.ipv4.route.redirect_load = 20
net.ipv4.route.redirect_number = 9
net.ipv4.route.redirect_silence = 20480
net.ipv4.route.error_cost = 1000
net.ipv4.route.error_burst = 5000
net.ipv4.route.gc_elasticity = 8
net.ipv4.route.mtu_expires = 600
net.ipv4.route.min_pmtu = 552
net.ipv4.route.min_adv_mss = 256
net.ipv4.route.secret_interval = 600
net.ipv4.igmp_max_memberships = 20
net.ipv4.igmp_max_msf = 10
net.ipv4.inet_peer_threshold = 65664
net.ipv4.inet_peer_minttl = 120
net.ipv4.inet_peer_maxttl = 600
net.ipv4.inet_peer_gc_mintime = 10
net.ipv4.inet_peer_gc_maxtime = 120
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_fack = 1
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_ecn = 0
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_mem = 780288 1040384 1560576
net.ipv4.tcp_wmem = 4096 16384 4194304
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.icmp_ratelimit = 1000
net.ipv4.icmp_ratemask = 6168
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_frto = 0
net.ipv4.tcp_frto_response = 0
net.ipv4.tcp_low_latency = 0
net.ipv4.ipfrag_secret_interval = 600
net.ipv4.ipfrag_max_dist = 64
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_abc = 0
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_base_mss = 512
net.ipv4.tcp_workaround_signed_windows = 0
net.ipv4.tcp_dma_copybreak = 4096
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.cipso_cache_enable = 1
net.ipv4.cipso_cache_bucket_size = 10
net.ipv4.cipso_rbm_optfmt = 0
net.ipv4.cipso_rbm_strictvalid = 1
net.ipv4.tcp_available_congestion_control = cubic reno
net.ipv4.tcp_allowed_congestion_control = cubic reno
net.ipv4.tcp_max_ssthresh = 0
net.ipv4.neigh.default.mcast_solicit = 3
net.ipv4.neigh.default.ucast_solicit = 3
net.ipv4.neigh.default.app_solicit = 0
net.ipv4.neigh.default.retrans_time = 99
net.ipv4.neigh.default.base_reachable_time = 30
net.ipv4.neigh.default.delay_first_probe_time = 5
net.ipv4.neigh.default.gc_stale_time = 60
net.ipv4.neigh.default.unres_qlen = 3
net.ipv4.neigh.default.proxy_qlen = 64
net.ipv4.neigh.default.anycast_delay = 99
net.ipv4.neigh.default.proxy_delay = 79
net.ipv4.neigh.default.locktime = 99
net.ipv4.neigh.default.gc_interval = 30
net.ipv4.neigh.default.gc_thresh1 = 128
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh3 = 1024
net.ipv4.neigh.default.retrans_time_ms = 1000
net.ipv4.neigh.default.base_reachable_time_ms = 30000
net.ipv4.neigh.eth0.mcast_solicit = 3
net.ipv4.neigh.eth0.ucast_solicit = 3
net.ipv4.neigh.eth0.app_solicit = 0
net.ipv4.neigh.eth0.retrans_time = 99
net.ipv4.neigh.eth0.base_reachable_time = 30
net.ipv4.neigh.eth0.delay_first_probe_time = 5
net.ipv4.neigh.eth0.gc_stale_time = 60
net.ipv4.neigh.eth0.unres_qlen = 3
net.ipv4.neigh.eth0.proxy_qlen = 64
net.ipv4.neigh.eth0.anycast_delay = 99
net.ipv4.neigh.eth0.proxy_delay = 79
net.ipv4.neigh.eth0.locktime = 99
net.ipv4.neigh.eth0.retrans_time_ms = 1000
net.ipv4.neigh.eth0.base_reachable_time_ms = 30000
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.all.accept_redirects = 1
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.shared_media = 1
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.all.medium_id = 0
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.all.tag = 0
net.ipv4.conf.all.arp_filter = 0
net.ipv4.conf.all.arp_announce = 0
net.ipv4.conf.all.arp_ignore = 0
net.ipv4.conf.all.arp_accept = 0
net.ipv4.conf.all.disable_xfrm = 0
net.ipv4.conf.all.disable_policy = 0
net.ipv4.conf.all.force_igmp_version = 0
net.ipv4.conf.all.promote_secondaries = 0
net.ipv4.conf.default.forwarding = 0
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.default.accept_redirects = 1
net.ipv4.conf.default.secure_redirects = 1
net.ipv4.conf.default.shared_media = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.default.medium_id = 0
net.ipv4.conf.default.bootp_relay = 0
net.ipv4.conf.default.log_martians = 0
net.ipv4.conf.default.tag = 0
net.ipv4.conf.default.arp_filter = 0
net.ipv4.conf.default.arp_announce = 0
net.ipv4.conf.default.arp_ignore = 0
net.ipv4.conf.default.arp_accept = 0
net.ipv4.conf.default.disable_xfrm = 0
net.ipv4.conf.default.disable_policy = 0
net.ipv4.conf.default.force_igmp_version = 0
net.ipv4.conf.default.promote_secondaries = 0
net.ipv4.conf.eth0.forwarding = 0
net.ipv4.conf.eth0.mc_forwarding = 0
net.ipv4.conf.eth0.accept_redirects = 1
net.ipv4.conf.eth0.secure_redirects = 1
net.ipv4.conf.eth0.shared_media = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.eth0.send_redirects = 1
net.ipv4.conf.eth0.accept_source_route = 0
net.ipv4.conf.eth0.proxy_arp = 0
net.ipv4.conf.eth0.medium_id = 0
net.ipv4.conf.eth0.bootp_relay = 0
net.ipv4.conf.eth0.log_martians = 0
net.ipv4.conf.eth0.tag = 0
net.ipv4.conf.eth0.arp_filter = 0
net.ipv4.conf.eth0.arp_announce = 0
net.ipv4.conf.eth0.arp_ignore = 0
net.ipv4.conf.eth0.arp_accept = 0
net.ipv4.conf.eth0.disable_xfrm = 0
net.ipv4.conf.eth0.disable_policy = 0
net.ipv4.conf.eth0.force_igmp_version = 0
net.ipv4.conf.eth0.promote_secondaries = 0
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