Date: Wed, 21 Dec 2011 14:04:04 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Tom Evans" <tevans.uk@googlemail.com>, "Randy Schultz" <schulra@earlham.edu> Cc: freebsd-performance@freebsd.org, Matthew Tippett <matthew@phoronix.com> Subject: Re: Benchmark (Phoronix): FreeBSD 9.0-RC2 vs. Oracle Linux 6.1Server Message-ID: <25E425F57A7348808EA5E89670F8F337@multiplay.co.uk> References: <4EE1EAFE.3070408@m5p.com><CAJ-FndDniGH8QoT=kUxOQ%2BzdVhWF0Z0NKLU0PGS-Gt=BK6noWw@mail.gmail.com><4EE2AE64.9060802@m5p.com> <4EE88343.2050302@m5p.com><CAFHbX1%2B5PttyZuNnYot8emTn_AWkABdJCvnpo5rcRxVXj0ypJA@mail.gmail.com><4EE933C6.4020209@zedat.fu-berlin.de><CAPjTQNEJDE17TLH-mDrG_-_Qa9R5N3mSeXSYYWtqz_DFidzYQw@mail.gmail.com><20111215024249.GA13557@icarus.home.lan><4EE9A2A0.80607@zedat.fu-berlin.de><CADWvR2hpooV4Sdkzor6oHpXWkLCz0z0UxBB_-nnrnYLeUY5oow@mail.gmail.com><CANY-Wm8DmFxm7xwXfRcyBSu4z6fTOap%2By=Mhx%2BuBP=uJN4g3fw@mail.gmail.com><4EF1121F.9010209@zedat.fu-berlin.de><4EF11B57.7090007@phoronix.com><alpine.BSF.2.00.1112210801590.49042@tdream.lly.earlham.edu> <CAFHbX1J-7AQpC=qGD5K9wpcoz0qK=RksWyyP34H-U2%2BpLosJsw@mail.gmail.com>
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----- Original Message -----
From: "Tom Evans" <tevans.uk@googlemail.com>
> I think that a good SA will at least consider how drives are arranged.
> We don't just slap ZFS on a single disk and expect magic to happen, we
> consider how write heavy a system will be and consider a dedicated
> ZIL, we consider what proportion of files will be re-read and how much
> application memory will be required and adjust ARC and L2ARC
> accordingly. Tuning and foresight are important.
With the additional features and easy of management when using ZFS
vs. UFS I know which one we choose even on single disk machines
with no L2ARC.
Its all very well people saying but if you tune this or tune that it would
be much better, but where is the information on how to do this in
various scenarios?
If we want people to do that the information needs to be easily available
and currently that's not the case, if an admin have a network related issue
they will search for the solution and apply the fix, for db's the same but
that's very time consuming and very error prone.
The idea of some default profiles which take into account the amount
of memory on the machine + user answered questions as to the roll
to create a sensible install default is a great idea.
Regards
Steve
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