The latency issue might improve with this rfe 6471212 need reserved I/O scheduler slots to improve I/O latency of critical ops
-r Tom Duell writes: > Group, > > We are running a benchmark with 4000 users > simulating a hospital management system > running on Solaris 10 6/06 on USIV+ based > SunFire 6900 with 6540 storage array. > > Are there any tools for measuring internal > ZFS activity to help us understand what is going > on during slowdowns? > > We have 192GB of RAM and while ZFS runs > well most of the time, there are times where > the system time jumps up to 25-40% > as measured by vmstat and iostat. These > times coincide with slowdowns in file access > as measured by a side program that simply > reads a random block in a file... these response > times can exceed 1 second or longer. > > Any pointers greatly appreaciated! > > Tom > > > <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> > <html> > <head> > <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"> > <title></title> > </head> > <body text="#000000" bgcolor="#ffffff"> > <font face="Helvetica, Arial, sans-serif">Group,<br> > <br> > We are running a benchmark with 4000 users<br> > simulating a hospital management system<br> > running on Solaris 10 6/06 on USIV+ based<br> > SunFire 6900 with 6540 storage array.<br> > <br> > Are there any tools for measuring internal<br> > ZFS activity to help us understand what is going <br> > on during slowdowns?<br> > <br> > We have 192GB of RAM and while ZFS runs<br> > well most of the time, there are times where<br> > the system time jumps up to 25-40%<br> > as measured by vmstat and iostat. These<br> > times coincide with slowdowns in file access<br> > as measured by a side program that simply<br> > reads a random block in a file... these response<br> > times can exceed 1 second or longer.<br> > <br> > Any pointers greatly appreaciated!<br> > <br> > Tom<br> > <br> > <br> > </font> > </body> > </html> > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
