[CALUG] Fwd: November 13 Meeting Announcement - ZFS Overview

Keith keith at keithf4.com
Sat Nov 16 19:05:06 EST 2013

My apologies Randal, I forgot to forward along Eric's answers to your
questions to the list.
The presentation's slides are available on the CALUG website.

---------- Forwarded message ----------
From: Eric Sproul <esproul at omniti.com>
Date: Thu, Nov 7, 2013 at 1:41 PM
Subject: Re: [CALUG] November 13 Meeting Announcement - ZFS Overview
To: Keith <keith at keithf4.com>

I'll answer the questions as best I can and let you forward them back
to the list.

On Thu, Nov 7, 2013 at 12:13 PM, Keith <keith at keithf4.com> wrote:
> ---------- Forwarded message ----------
> From: Randal T. Rioux <randy at procyonlabs.com>
> Date: Wed, Nov 6, 2013 at 12:08 AM
> Subject: Re: [CALUG] November 13 Meeting Announcement - ZFS Overview
> To: calug at unknownlamer.org

> One thing that attracted me is the snapshot capability, and that I can
> set gzip-7 at the filesystem level (avg 1.18x compression right now!)
> and transfer are actually *faster* with compression on :-)

This is true, because most file servers have CPU cycles to spare, and
trading extra CPU for reduced IOPS is almost always a win.  I'd note
that with mostly uncompressable data (1.18x would qualify), the
default compression algorithm (lzjb) will likely be even faster than
gzip, especially at level 7.  The more recent addition of lz4 should
be faster still, especially on uncompressable data.

I'll be covering compression options in the talk.

> One quick one now if you don't mind before the talk: what is the best
> way to schedule a snapshot regimen for 1, 3, 7 and 30 days including
> destroying old ones? I see scripts and stuff on the Web, but they all
> look different and seem to over complicate things.

"Best way" invites lots of opinions, so I'll simply say that snapshots
may be created at will and destroyed without respect to sequence.  So
you can take snapshots at some minimum interval, then later on make a
decision about which ones to keep or delete.

> Tangent: can you tell us more about OmniOS (online info is scarce) and
> whether Circonus is purely commercial (appears so)?

OmniOS is a distribution of illumos (http://illumos.org) which is an
open-source fork of the former OpenSolaris codebase.  It is a
minimalist distribution aimed at traditional enterprise server
deployments.  The mission statement is here:
http://omnios.omniti.com/wiki.php/OmniOSJeOS and contains a link to
Theo's LISA'12 talk, "OmniOS Motivation and Design".

Circonus is indeed a commercial product, but the metrics collection
engine that it uses is the open-source Reconnoiter project:

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