Re: is there any way to increase disk performance ?
Tim Judd wrote: Yavuz wrote: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? So in one second, the disk hits 100% utilization, weather it's reading or writing data to disk. You said above that I rarely see -- so even though, as a server, you're running slow spindles, you are doing pretty good. I've no real experience with a site that's (for example) been slashdotted, to test what is tolerable, and what's not. But as I currently guess, an OVERALL average between 25% to 33% is about as much as I would ever tax a server for CONSISTENT averages. So if you're seeing it rarely, such as when somebody hits webmail and takes 1 second of constant disk read to serve the content, I'd be happy there... I don't think you have a problem, when you put your concern into the broader scope of 1 minute, 1 hour, 1 day or 1 week. It'll be very difficult to never see 100% in 1 second no matter how powerful the machine is. Make sure you understand that gstat's %busy column does not tell you how close to capacity your disk is, it tells you what % of time it is handling I/O. Since modern drives can have many commands queued at any given time, those are not the same thing. To understand whether your disk is overloaded, look at the ms/r and ms/w times. Kris ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
I increased values of vfs.read_max and MAXPHYS. I observe the disk's performance. New these values help disk performance clearly. Thanks. Yavuz wrote: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? sysctl vfs.read_max=32 can help read performance ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
Ok. I increased vfs.read_max while I was looking into this case in google, I see a value of MAXPHYS in my kernel, there is a value called MAXPHYS=(128*1024) as default. What should I set this value ? Yavuz wrote: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? sysctl vfs.read_max=32 can help read performance ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
while I was looking into this case in google, I see a value of MAXPHYS in my kernel, there is a value called MAXPHYS=(128*1024) as default. What should I set this value ? i use 1024*1024 Yavuz wrote: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? sysctl vfs.read_max=32 can help read performance ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
Yavuz wrote: Ok. I increased vfs.read_max while I was looking into this case in google, I see a value of MAXPHYS in my kernel, there is a value called MAXPHYS=(128*1024) as default. What should I set this value ? Neither vfs.read_max nor MAXPHYS will help a mail server (or any other server dealing with small files). signature.asc Description: OpenPGP digital signature
is there any way to increase disk performance ?
I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
In response to Yavuz mas...@ihlas.net.tr: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? 7200 RPM is a slow disk. You may be hardware bound. Have a look at gstat and see how long read and write requests are taking. If you have questions, post actual gstat output to the list, not your interpretation of it. Make sure your partitions are mounted noatime (see the man page for mount_ffs) Also, make sure they are configured with softupdates turned on (see the man page for tunefs) If you're not using Maildir for your mail storage, then switch. mboxes get really slow when they get large. Provide more details about your problem if you want more specific answers. -- Bill Moran http://www.potentialtech.com http://people.collaborativefusion.com/~wmoran/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
Yavuz wrote: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? sysctl vfs.read_max=32 can help read performance ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? i don't understand your problem. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: is there any way to increase disk performance ?
Yavuz wrote: I have freebsd7 (amd64 bit) and sata2 disk 7200 rpm. it's running mail server which has services like pop3,imap,smtp and webmail on this machine. When I type systat 1 -vmstat on command line, even I rarely see that disk usage hits 100%. I have no problem as ram and cpu. they is enough. is there any way to increase disk performance without causing any problem ? So in one second, the disk hits 100% utilization, weather it's reading or writing data to disk. You said above that I rarely see -- so even though, as a server, you're running slow spindles, you are doing pretty good. I've no real experience with a site that's (for example) been slashdotted, to test what is tolerable, and what's not. But as I currently guess, an OVERALL average between 25% to 33% is about as much as I would ever tax a server for CONSISTENT averages. So if you're seeing it rarely, such as when somebody hits webmail and takes 1 second of constant disk read to serve the content, I'd be happy there... I don't think you have a problem, when you put your concern into the broader scope of 1 minute, 1 hour, 1 day or 1 week. It'll be very difficult to never see 100% in 1 second no matter how powerful the machine is. HTH --Tim ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
