Date: Thu, 26 May 2016 12:48:22 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: zfs receive stalls whole system Message-ID: <20160526124822.374b2dea@fabiankeil.de> In-Reply-To: <20160517123627.699e2aa5@fabiankeil.de> References: <0C2233A9-C64A-4773-ABA5-C0BCA0D037F0@ultra-secure.de> <20160517102757.135c1468@fabiankeil.de> <c090ab7bbff2fffe2a49284f9be70183@ultra-secure.de> <20160517123627.699e2aa5@fabiankeil.de>
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[-- Attachment #1 --] Fabian Keil <freebsd-listen@fabiankeil.de> wrote: > rainer@ultra-secure.de wrote: > > > Am 2016-05-17 10:27, schrieb Fabian Keil: > > > 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-slaves, the sender is actively used as NFS-server, the > > >> recipient is just a warm-standby, in case something serious happens > > >> and we don’t want to wait for a day until the restore is back in > > >> place. The MySQL-Slaves are actively used as read-only servers (at the > > >> application level, Python’s SQL-Alchemy does that, apparently). > > >> > > >> 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 > > >> individual 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 reading from the disk at the same time (backup agent). > > >> > > >> I had this before, on 10.0 (I believe, we didn’t have this in 9.1 > > >> either, IIRC) and it went away in 10.1. > > > > > > Do you use geli for swap device(s)? > > > > > > Yes, I do. > > /dev/mirror/swap.eli none swap sw 0 0 > > > > Bad idea? > > It can cause deadlocks and poor performance when paging. > > This was recently fixed in ElectroBSD and I intend to submit > the patch in a couple of days after a bit more stress testing. Done: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209759 Fabian [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAldG1HcACgkQBYqIVf93VJ0TDgCeKKfOKu3Say8K0QDsWuAPmhPA s3AAoJPlCDWMXyVZJOBsOQulUU94U+hS =f3f2 -----END PGP SIGNATURE-----
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