Date: Tue, 17 May 2016 10:27:57 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: zfs receive stalls whole system Message-ID: <20160517102757.135c1468@fabiankeil.de> In-Reply-To: <0C2233A9-C64A-4773-ABA5-C0BCA0D037F0@ultra-secure.de> References: <0C2233A9-C64A-4773-ABA5-C0BCA0D037F0@ultra-secure.de>
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--Sig_/ZojT=4SLUeXeJZEf2IdOajl Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Rainer Duffner <rainer@ultra-secure.de> wrote: > I have two servers, that were running FreeBSD 10.1-AMD64 for a long time,= one zfs-sending to the other (via zxfer). Both are NFS-servers and MySQL-s= laves, the sender is actively used as NFS-server, the recipient is just a w= arm-standby, in case something serious happens and we don=E2=80=99t want to= wait for a day until the restore is back in place. The MySQL-Slaves are ac= tively used as read-only servers (at the application level, Python=E2=80=99= s SQL-Alchemy does that, apparently). >=20 > They are HP DL380G8 (one CPU, hexacore) with over 128 GB RAM (I think one= has 144, the other has 192). > While they were running 10.1, they used HP P420 RAID-controllers with ind= ividual 12 RAID0 volumes that I pooled into 6-disk RAIDZ2 vdevs. > I use zfsnap to do hourly, daily and weekly snapshots. [...] > Now, when I do a zxfer, sometimes the whole system stalls while the data = is sent over, especially if the delta is large or if something else is read= ing from the disk at the same time (backup agent). >=20 > I had this before, on 10.0 (I believe, we didn=E2=80=99t have this in 9.1= either, IIRC) and it went away in 10.1. Do you use geli for swap device(s)? > It=E2=80=99s very difficult (well, impossible) to debug, because the syst= em totally hangs and doesn=E2=80=99t accept any keypresses. You could try reducing ZFS's deadman timeout to get a panic. On systems with local disks I usually use: vfs.zfs.deadman_enabled: 1 vfs.zfs.deadman_checktime_ms: 5000 vfs.zfs.deadman_synctime_ms: 10000 Fabian --Sig_/ZojT=4SLUeXeJZEf2IdOajl Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlc61g4ACgkQBYqIVf93VJ0shgCaA2wnHQq+AKX3XK7yt5jWKHZ/ rUEAn1IMBjKGvRcA9ZljB/Qy7cY0gLAk =TR3y -----END PGP SIGNATURE----- --Sig_/ZojT=4SLUeXeJZEf2IdOajl--
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