Gathering statistics on disk usage
I am trying to set up mrtg to graph disk usage. I've tried using the output of iostat to provide me with usage in MB/s. The problem with this is that moving data from disk to disk on the system causes the usage to jump to around 30MB/s. Even with mrtg configured to draw the graphs logarithmically they basically blow up and the normal transfers are not really visable. systat -vm gives statistics on disk usage with a percent busy field. This stat would be easier to graph and I would like to use it. My problem is that I can't seem to extract the output of systat properly. I've tried doing systat -vm | tail -n -1 and that doesn't work. I've also tried systat -vm somefile.txt and that doesn't work. There doesn't seem to be a way to get systat to run once and then quit either. Can anyone think of a way to either capture systat's output or recommend a utility that will give me a % busy output? I've tried iostat without success. -- Thanks, Josh Paetzel ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Gathering statistics on disk usage
In the last episode (Oct 15), Josh Paetzel said: I am trying to set up mrtg to graph disk usage. I've tried using the output of iostat to provide me with usage in MB/s. The problem with this is that moving data from disk to disk on the system causes the usage to jump to around 30MB/s. Even with mrtg configured to draw the graphs logarithmically they basically blow up and the normal transfers are not really visable. systat -vm gives statistics on disk usage with a percent busy field. This stat would be easier to graph and I would like to use it. My problem is that I can't seem to extract the output of systat properly. I've tried doing systat -vm | tail -n -1 and that doesn't work. I've also tried systat -vm somefile.txt and that doesn't work. There doesn't seem to be a way to get systat to run once and then quit either. Can anyone think of a way to either capture systat's output or recommend a utility that will give me a % busy output? I've tried iostat without success. If you apply the patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/68840, you will be able to get %busy stats out of iostat. You can also try installing net-snmp and polling the diskIOLA5 value for the disk, but on my system at least, the values don't seem to make sense (I have seen numbers from -2546 to 3000). -- Dan Nelson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Gathering statistics on disk usage
If you apply the patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/68840, you will be able to get %busy stats out of iostat. Thanks for your quick reply. Unfortunately your patch does not apply cleanly to a 4.11-STABLE box. I can supply iostat.c.rej if you want it. I also tried it on a 5.4-RELENG-p7 box and it failed there as well. -- Thanks, Josh Paetzel ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Gathering statistics on disk usage
In the last episode (Oct 15), Josh Paetzel said: If you apply the patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/68840, you will be able to get %busy stats out of iostat. Thanks for your quick reply. Unfortunately your patch does not apply cleanly to a 4.11-STABLE box. I can supply iostat.c.rej if you want it. I also tried it on a 5.4-RELENG-p7 box and it failed there as well. It definitely should have applied cleanly on 5.4. I just tested it. Try downloading the Raw PR link at the bottom of the page; that will remove any html-escaping. The patch won't work on 4.x because the devstat interface got overhauled between 4.x and 5.x. -- Dan Nelson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Gathering statistics on disk usage
It definitely should have applied cleanly on 5.4. I just tested it. Try downloading the Raw PR link at the bottom of the page; that will remove any html-escaping. The patch won't work on 4.x because the devstat interface got overhauled between 4.x and 5.x. All right, I get the point hat for this one. You're right, it works fine on 5.4 for me now. -- Thanks, Josh Paetzel ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
