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Operating Systems Solaris Network writes contantly spiking in throughput Post 302378060 by achenle on Sunday 6th of December 2009 09:05:35 PM
Old 12-06-2009
The writes from CIFS are probably synchronous to ensure reliable data transfer all the way from the client to disk platters. If so, what you're seeing is a feature of ZFS. Read the "ZFS Evil Tuning Guide" and pay particular attention to the ARC and ZIL sections. You can try disabling your ZIL and see if your jumpiness disappears.

FWIW, unless you have a need to have deterministic performance at all times, I wouldn't worry too much about what you're seeing. Especially if the jumpiness in IO throughput disappears if you test with the ZIL disabled.

In my opinion, ZFS has a weakness in its ability to guarantee deterministic performance. Similar to what you're seeing, in my experience ZFS tends to be very episodic in the way it writes data to disk. Most of the time it's pretty fast, but every few seconds I've noted that when it is under a continuous write load, ZFS tends to grind to a short halt.
 

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ZFSLOADER(8)						    BSD System Manager's Manual 					      ZFSLOADER(8)

NAME
zfsloader -- kernel bootstrapping final stage DESCRIPTION
zfsloader is an extended variant of loader(8) with added support for booting from ZFS. This document describes only differences from loader(8). ZFS FEATURES
zfsloader supports the following format for specifying ZFS filesystems which can be used wherever loader(8) refers to a device specification: zfs:pool/filesystem: where pool/filesystem is a ZFS filesystem name as described in zfs(8). If /etc/fstab does not have an entry for the root filesystem and vfs.root.mountfrom is not set, but currdev refers to a ZFS filesystem, then zfsloader will instruct kernel to use that filesystem as the root filesystem. ZFS COMMAND EXTENSIONS
lsdev [-v] Lists ZFS pools in addition to disks and partitions. Adding -v shows more ZFS pool details in a format that resembles zpool status output. lszfs filesystem A ZFS extended command that can be used to explore the ZFS filesystem hierarchy in a pool. Lists the immediate children of the filesystem. The filesystem hierarchy is rooted at a filesystem with the same name as the pool. FILES
/boot/zfsloader zfsloader itself. EXAMPLES
Set the default device used for loading a kernel from a ZFS filesystem: set currdev=zfs:tank/ROOT/knowngood: SEE ALSO
gptzfsboot(8), loader(8), zfs(8), zfsboot(8), zfsloader(8), zpool(8) HISTORY
The zfsloader first appeared in FreeBSD 7.3. AUTHORS
This manual page was written by Andriy Gapon <avg@FreeBSD.org>. BSD
September 15, 2014 BSD
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