Re: [Avid-L2] OT: Mac Drive Format Optimization

Brian was right, but I couldn't resist testing as I had the perfect
opportunity.

Empty 3GB RAID 0, inside brand new 8-core. Tried 16, 32, 64, and 256k
stripes. Using AJA System Test set to 1080-8-bit, with file sizes
from 512k-8GB

At all file sizes, 32k was the winner or within 1% on read speeds.

Overall, high to low numbers on all tests varied by only about 2%
except for one or two outliers. In general, larger stripes favored
larger files and smaller stripes favored smaller files.

The difference writing files was more significant with the 32k size
trailing at all file sizes by .5% on smallest to about 3% on larger
sizes.

The outlier was the 16k stripe which was significantly inferior for
both 512k and 8GB files. It was competitive at 1 and 4GB. Go
figure. The killer was that it was almost 5% slower reading at the
8GB file size and 2-3% at the 512K size.

Inquiring minds and all. The unanswered question is block size. The
block size in all cases is, of course, 4K, and that may well be the
controlling factor.

Cheers,
tod

On Jun 2, 2010, at 12:27 PM, B Conner, Avid wrote:

> I think you'll find the best setting the the RAID is 32k. YMMV.
>
> Brian Conner
>
> Tod Hopkins wrote:
> > According to what I've read, the "block" size setting for RAID
> > formatting is mislabeled. That sets the RAID stripe interleave size
> > (whose correct name now escapes me) but the file system " block"
> size
> > is still 4K. However, setting the RAID stripe as high as possible
> may
> > be better for large media files for the same reason that increasing
> > block size might be. I'm actually going to run a simple test on an
> > empty RAID pair today. I'll let you know. Also according to what
> > I've read, there is no way to set the block size manually in OSX for
> > HFS+.
> >
> > Cheers,
> > tod
> >
> >
> >
> >
> > On Jun 1, 2010, at 6:52 PM, Rupert Watson wrote:
> >
> >> You can set the block size if you create a RAID set in Disk Util
> >>
> >> Never bothered looking if I was only formatting one disk.
> >>
> >> Rupert Watson
> >>
> >> +44 7787 554 801
> >>
> >> www.root6.com
> >>
> >> From: Avid-L2@yahoogroups.com [mailto:Avid-L2@yahoogroups.com] On
> >> Behalf
> >> Of Tod Hopkins
> >> Sent: 01 June 2010 23:35
> >> To: Avid-L2-yahoogroups.com
> >> Subject: [Avid-L2] OT: Mac Drive Format Optimization
> >>
> >> So HFS+ uses a 4K block. No options. Why not?
> >>
> >> Can anyone tell me why I can't find anything at all about using a
> >> larger block size to optimize for video? Or alternately why this is
> >> just dumb question?
> >>
> >> Sometimes inquiring minds just want to know, and I'm baffled that I
> >> can't find anything that even addresses the idea in any meaningful
> >> way.
> >>
> >> Cheers,
> >> tod
> >>
> >> Tod Hopkins
> >> Hillmann & Carr Inc.
> >> todhopkins@hillmanncarr.com <mailto:todhopkins%40hillmanncarr.com>
> >>
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> >> [Non-text portions of this message have been removed]
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> >>
> >>
> >
> > Tod Hopkins
> > Hillmann & Carr Inc.
> > todhopkins@hillmanncarr.com
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
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>

Tod Hopkins
Hillmann & Carr Inc.
todhopkins@hillmanncarr.com

[Non-text portions of this message have been removed]

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