On Friday, 23 September 2016 11:24:41 AM AEST Peter Ross via luv-main wrote:
For the messages: FreeBSD has a sysctl vfs.zfs.debug. This sysctl approach was ported to Linux, my Google 'research' (e.g. http://askubuntu.com/questions/228386/how-do-you-apply-performance-tuning-se ttings-for-native-zfs) indicates, so you may be able to use it under Linux too.
# modinfo zfs|grep debug parm: zfs_dbgmsg_enable:Enable ZFS debug message log (int) parm: zfs_dbgmsg_maxsize:Maximum ZFS debug log size (int) parm: zfs_flags:Set additional debugging flags (uint) parm: metaslab_debug_load:load all metaslabs when pool is first opened (int) parm: metaslab_debug_unload:prevent metaslabs from being unloaded (int) It seems that there are module parameters for this. # find /sys/module/zfs|grep debug /sys/module/zfs/parameters/metaslab_debug_load /sys/module/zfs/parameters/metaslab_debug_unload But the ones I want can only be set at boot time. The Linux port of ZFS doesn't have all the features of the BSD ports.
BTW: There is a Nagios/Icinga check_zfs plugin.
Thanks for the pointer. I've attached a modified version of that which works with zfsonlinux. I don't think it's a very useful plugin, I tested it on a zpool that has multiple checksum errors and it reports no problems!
I did not know about "mon" before... How does it compare to Nagios/Icinga?
Nagios has a web based interface to manage it that allows acknowledging error conditions. This is a great feature if you have a large team of sysadmins, someone can acknowledge a problem before starting work so no-one else duplicates their effort. For a smaller network this sort of thing isn't necessary and the added complexity of Nagios just gets in the way. Mon is much simpler and has a single config file. The Nagios model is to have a single very complex monitoring system while the mon model tends towards multiple simple installations. Nagios has a nrpe daemon on each monitored server while with Mon you have Mon on each server and a master Mon monitoring them all. I gave a LUV lecture about Mon earlier this year. I could run a hands-on tutorial at the Beginner's SIG if there's interest. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/