Date: Sun, 12 Aug 2018 20:50:47 +0200 From: Marco Steinbach <coco@executive-computing.de> To: freebsd-stable@freebsd.org Subject: Jails on ZFS yielding 100% load on gstat Message-ID: <20180812205047.00002767@executive-computing.de>
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Hi there.
% zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP 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 manage them,
including a websever and a mailserver. The mailserver is using a MySQL
database, otherwise depending on dovecot and postfix. Very low volume,
just a few polls / logins per minute.
I am experiencing very high loads as per gstat:
dT: 1.021s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
4 181 0 0 0.0 169 873 20.1 98.2| ada0
2 111 0 0 0.0 100 540 7.3 90.6| ada1
0 88 0 0 0.0 76 458 1.4 43.3| ada2
0 0 0 0 0.0 0 0 0.0 0.0| ada0p1
3 150 0 0 0.0 150 603 20.2 95.1| ada0p2
1 31 0 0 0.0 20 270 19.2 117.0| ada0p3
0 0 0 0 0.0 0 0 0.0 0.0| gpt/gptboot0
0 0 0 0 0.0 0 0 0.0 0.0| ada1p1
1 85 0 0 0.0 85 341 8.4 68.9| ada1p2
1 25 0 0 0.0 15 200 0.9 75.0| ada1p3
0 0 0 0 0.0 0 0 0.0 0.0| ada2p1
0 62 0 0 0.0 62 251 1.6 9.9| ada2p2
0 26 0 0 0.0 15 208 0.5 42.0| ada2p3
0 0 0 0 0.0 0 0 0.0 0.0| gpt/gptboot1
0 0 0 0 0.0 0 0 0.0 0.0| gpt/gptboot2
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.
Restarting the jails (or even the whole machine at that) ends me up at
exactly the same situation.
I do have lab machines for running load scenarios, so if anyone feels
compelled to lend a hand, please do.
MfG CoCo
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