Re: Jails on ZFS yielding 100% load on gstat

2018-08-14 Thread Marco Steinbach
On Sun, 12 Aug 2018 20:50:47 +0200 Marco Steinbach wrote: > Hi there. > [...] Thanks for all the answers and suggestions -- one of the MySQL databases contained a defective table, repairing it brought the storage load down to normal levels. I've had defective tables on UFS in the past, and can

Re: Jails on ZFS yielding 100% load on gstat

2018-08-14 Thread Mike Tancsa
On 8/14/2018 5:57 AM, Marco Steinbach wrote: > > All my machines have at least 32GB, I've limited the maximum ARC size > to 4GB, though, since last time I checked ZFS took quite a large piece > of the cake, and didn't give it back, when not limited by setting > vfs.zfs.arc_max in loader.conf :) B

Re: Jails on ZFS yielding 100% load on gstat

2018-08-14 Thread Marco Steinbach
On Mon, 13 Aug 2018 10:56:01 -0400 "Kevin P. Neal" wrote: > On Sun, Aug 12, 2018 at 08:50:47PM +0200, Marco Steinbach wrote: > > Hi there. > > > > % zpool list > > NAMESIZE ALLOC FREE EXPANDSZ FRAGCAP DEDUP HEALTH > > ALTROOT zroot 5.41T 670G 4.75T -13%12% 1.

Re: Jails on ZFS yielding 100% load on gstat

2018-08-14 Thread Marco Steinbach
On Mon, 13 Aug 2018 10:12:26 -0400 Mike Tancsa wrote: > On 8/12/2018 2:50 PM, Marco Steinbach wrote: > > > > These loads lead to the system suffering from very much delayed > > responses to even the basic task of echoing characters entered on > > the console, consequently rendering the services

Re: Jails on ZFS yielding 100% load on gstat

2018-08-14 Thread Marco Steinbach
On Mon, 13 Aug 2018 08:09:00 -0600 Alan Somers wrote: > Jails probably aren't the source of your problem. You need to find > out what process or processes are responsible for all this activity. > Since the write bandwidth is fairly low, you might have a process > that's sync(2)ing or fsync(2)ing

Re: Jails on ZFS yielding 100% load on gstat

2018-08-13 Thread Mike Tancsa
On 8/12/2018 2:50 PM, Marco Steinbach wrote: > > These loads lead to the system suffering from very much delayed > responses to even the basic task of echoing characters entered on the > console, consequently rendering the services offered unusable to the > users because of the delays. Do you ha

Re: Jails on ZFS yielding 100% load on gstat

2018-08-13 Thread Alan Somers
Jails probably aren't the source of your problem. You need to find out what process or processes are responsible for all this activity. Since the write bandwidth is fairly low, you might have a process that's sync(2)ing or fsync(2)ing. too often. "gstat -o" will show if that's the case. You can

Jails on ZFS yielding 100% load on gstat

2018-08-13 Thread Marco Steinbach
Hi there. % zpool list NAMESIZE ALLOC FREE EXPANDSZ FRAGCAP DEDUP HEALTH ALTROOT zroot 5.41T 670G 4.75T -13%12% 1.00x ONLINE - % uname -a FreeBSD XXX 11.1-STABLE FreeBSD 11.1-STABLE #0 r322984 [...] amd64 I'm running multiple jails on ZFS, using ezjail to