Date: Mon, 07 Oct 2019 18:42:39 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 241083] zfs: zpool import seems to probe all snapshots Message-ID: <bug-241083-3630-Q1DAEsNyqz@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-241083-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-241083-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241083 --- Comment #21 from Martin Birgmeier <d8zNeCFG@aon.at> --- Here are two sets of results: [0]# ll /lib/libzfs.so.3* -r--r--r-- 1 root wheel 310944 Oct 6 09:10 /lib/libzfs.so.3 -r--r--r-- 1 root wheel 310944 Dec 30 2018 /lib/libzfs.so.3.ORIG [0]# sysctl vfs.zfs.vol.recursive vfs.zfs.vol.recursive: 0 [0]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.05s user 1.00s system 9% cpu 11.424 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.06s user 0.79s system 77% cpu 1.106 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.79s system 83% cpu 0.972 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.78s system 108% cpu 0.741 total [1]# sysctl vfs.zfs.vol.recursive=1 vfs.zfs.vol.recursive: 0 -> 1 [0]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.98s system 135% cpu 0.747 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.95s system 220% cpu 0.440 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.93s system 249% cpu 0.380 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.05s user 0.92s system 249% cpu 0.387 total [1]# sysctl vfs.zfs.vol.recursive=0 vfs.zfs.vol.recursive: 1 -> 0 [0]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.83s system 147% cpu 0.581 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.80s system 240% cpu 0.343 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.79s system 103% cpu 0.785 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.79s system 234% cpu 0.342 total [1]# One more observation: If there is medium to high disk load, such imports take much longer. For example, doing a 'tar cf /dev/null /z/backup/rsync' (with that directory holding a lot of stuff) in parallel, I get (the pool will give a read rate of between 50..200 MB/s, and the machine has 16 GB main memory): [0]# sysctl vfs.zfs.vol.recursive=0 vfs.zfs.vol.recursive: 1 -> 0 [0]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.85s system 12% cpu 6.924 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.81s system 16% cpu 5.110 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.78s system 21% cpu 3.753 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.85s system 11% cpu 7.981 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.02s user 0.81s system 15% cpu 5.366 total [1]# sysctl vfs.zfs.vol.recursive=1 vfs.zfs.vol.recursive: 0 -> 1 [0]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.98s system 9% cpu 10.749 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.97s system 12% cpu 7.945 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.94s system 28% cpu 3.382 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.04s user 0.95s system 8% cpu 11.164 total [1]# sysctl vfs.zfs.vol.recursive=0 vfs.zfs.vol.recursive: 1 -> 0 [0]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.81s system 8% cpu 10.134 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.01s user 0.81s system 11% cpu 7.034 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.80s system 9% cpu 8.948 total [1]# time zpool import nonexistent_pool cannot import 'nonexistent_pool': no such pool available zpool import nonexistent_pool 0.03s user 0.78s system 15% cpu 5.380 total [1]# diff =(strings /lib/libzfs.so.3.ORIG) =(strings /lib/libzfs.so.3) 870a871 > vfs.zfs.vol.recursive 1230a1232 > ZFS::ZVOL 1586a1589 > sysctlbyname 1989d1991 < sysctlbyname 2125,2126d2126 < fff. < ffff. 2128,2130d2127 < l$(I < \$0H < ffffff. 2131a2129,2132 > ffff. > fffff. > fffff. > s0A9 2987a2989 > Lc5= [1]# -- Martin -- You are receiving this mail because: You are the assignee for the bug.
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