Date: Thu, 14 Nov 2019 09:34:36 -0500 From: mike tancsa <mike@sentex.net> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: speeding up zfs snapshot listing Message-ID: <cee1b74f-26e2-541e-d275-501c219624ca@sentex.net>
index | next in thread | raw e-mail
We have a backup server that has a fair amount of zfs snapshots-- currently at 30,000+... To list them all takes about 20 seconds after caching, but can take upto a minute after boot up, or if the metadata has been evicted from ARC. Are there any tunings that can be done to to speed up the listing or at least make sure the metadata gets cached as best as possible ? We have a nagios check 4 times a day to make sure backups are running and fresh that sometimes times out. We will probably end up close to 50 to 60k worth of snapshots soon. The 20 seconds to list, seems to be all CPU bound. Looking at gstat zfs list -t snapshot is not hitting the disk. So not sure if anything can be done tuning wise ? ---Mikehelp
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?cee1b74f-26e2-541e-d275-501c219624ca>