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Hi, I am currently running a 10 Node OCFS2 Cluster (version 1.3.9-0ubuntu1) on Ubuntu Server 8.04 x86_64. Linux n1 2.6.24-24-server #1 SMP Tue Jul 7 19:39:36 UTC 2009 x86_64 GNU/Linux The Cluster is connected to a 1Tera iSCSI Device presented by an IBM 3300 Storage System, running over a 1Gig Network. Mounted on all nodes: /dev/sdc1 on /cfs1 type ocfs2

...l times. But it doesn't help. I still get confused with the output of 'iostat', the manual seems too abstract, or high-level, for me. Let's post the output first: avg-cpu: %user %nice %sys %idle 5.70 0.00 3.15 91.15 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util /dev/sdb1 0.60 4.70 12.60 1.50 105.60 49.60 52.80 24.80 11.01 1.54 10.92 8.65 12.20 I'll ask about the rrqm/s, r/s, rsec/s, avgrq-sz, avgqu-sz, await, svctm and %util in the above output. First que...

...------------------------------------------------------------------- This was sent from one of the techs working the problem: I think I located the problem. Collecting iostat data during the last lockup yielded the following information. Time: 03:20:38 PM Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 0.00 3.09 0.00 24.74 0.00 12.37 0.00 8.00 0.00 0.00 0.00 0.00 sdb 0.00 0.00 85.57 0.00 684.54 0.00 342.27 0.00 8.00 1.03 12.06 12.04 102.99 Time: 03:20:39...

Hi 2 all ! I have problems with concurrent filesystem actions on a ocfs2 filesystem which is mounted by 2 nodes. OS=RH5ES and OCFS2=1.2.6 F.e.: If I have a LV called testlv which is mounted on /mnt on both servers and I do a "dd if=/dev/zero of=/mnt/test.a bs=1024 count=1000000" on server 1 and do at the same time a du -hs /mnt/test.a it takes about 5 seconds for du -hs to execute: 270M

...9612k used, 6996340k free, 112092k buffers Swap: 0k total, 0k used, 0k free, 341304k cached [root at vserver ~]# iostat -d -x sda sdb sdc sdd sde sdf sg sdh Linux 2.6.18-164.6.1.el5xen (vserver.zimmermann.com) 20.11.2009 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 1364,57 0,66 1820,12 0,89 25477,44 12,37 14,00 1,11 0,61 0,41 75,10 sdb 1167,12 0,68 2017,45 0,89 25476,53 12,47 12,63 1,16 0,57 0,39 79,49 sdc 1308,06 0,66 1876,65...

...idea whats going on. Here is a bit of iostat -x output. [root at server ~]# iostat -x Linux 2.6.18-164.9.1.el5 (server.x.us) 01/05/2010 avg-cpu: %user %nice %system %iowait %steal %idle 0.13 0.10 0.03 38.23 0.00 61.51 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.18 0.33 0.04 0.20 27.77 4.22 132.30 3.70 15239.91 2560.21 61.91 sda1 0.00 0.00 0.00 0.00 0.34 0.00 654.72 0.01 12358.84 3704.24 0.19 sda2 0.18 0.00 0.04 0...

...0 592 189844 381732 537944 0 0 0 0 33 69 1 1 98 0 0 0 592 189844 381732 537944 0 0 0 0 24 32 0 0 100 0 0 0 592 190340 381732 537944 0 0 0 0 28 42 0 0 100 0 iostat -x 1 (excerpt) Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 171.00 0.00 124.00 0.00 2368.00 0.00 1184.00 19.10 0.14 1.13 0.02 0.20 sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdc...

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...e server. is there a way to check which process and which file is taking up disk IO? or see what is being written to the disk? i'm very puzzled as the amount of writes is 10 times higher than the reads; and I can't figure out what the writes are for. Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz sda3 2.20 32.94 2.12 17.42 34.54 407.74 17.27 203.87 22.63 avgqu-sz await svctm %util 1.28 65.38 5.10 9.97 Is it normal for the %util to be 9.97% for the above reads/ writes on a U320 drive? or perhaps i have a badly misconfig...

...ing thing is that we are seeing more writes than reads on our Dovecot volume when you would assume that most of the IO should be reads from customers checking their mail. We're seeing reads vs. writes similar to the following: # iostat -d 5 -x Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util dm-4 0.00 0.00 485.80 865.80 3886.40 6926.40 8.00 28.69 19.63 0.70 94.00 drbd0 0.00 0.00 485.80 865.80 3886.40 6926.40 8.00 111.42 94.44 0.74 99.60 We can't figure out why we would be see...

Op 29-01-15 om 00:00 schreef Gordon Messmer: > On 01/28/2015 12:12 PM, Patrick Bervoets wrote: >> >> ARPING 192.168.1.15 from 0.0.0.0 br0 >> Unicast reply from 192.168.1.15 [AC:16:2D:72:67:D4] 0.723ms >> Sent 1 probes (1 broadcast(s)) >> Received 1 response(s) >> >> Thanks anyway > > I'm not sure what you mean by "thanks anyway".

Hi All I have xeon server with 16 Gb Ram and no Swap memory.I am running cassandra server on two node in cluster.When there is high load on server kswapd0 kicks inn and take 100% cpu and make machine very slow and we need to restart out cassandra server.I have latest kernel 2.6.18-238.9.1.el5.Please let me know how can i fix this issue .Its hurting us badly this our production server any

...ppiness with "echo 10 >/proc/sys/vm/swappiness" > _______________________________________________ iostat random sample avg-cpu: %user %nice %system %iowait %steal %idle 3,77 0,00 1,45 0,00 0,00 94,78 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0,00 0,50 0,00 11,00 0,00 136,00 12,36 0,00 0,00 0,00 0,00 sdb 0,00 0,00 0,00 11,50 0,00 148,00 12,87 0,00 0,09 0,09 0,10 sdc 0,00 0,00 0,00...

Hi, I have a problematic CentOS XEN server and hope someone could point me in the right direction to optimize it a bit. The server runs on a Core2Quad 9300, with 8GB RAM (max motherboard can take, 1U chassis) on an Intel motherboard with a 1TB SATA HDD. dom0 is set to 512MB limit with a few small XEM VM's running: root at zaxen01:[~]$ xm list Name ID