Re: Squid & Advfs disks

>
> > what is the best way to have the best performances ? :
> >
> > 1: 6 separates disks in UFS .
> >
> > 2: 6 seperates disk in differents advfs domains .
> >
> > 3: the 6 disks in 1 advfs domain with 6 filesets
> >
> > 4: the 6 disks in 1 advfs domain with 1 fileset ????
>
>
> You will definitely want to use advfs, as it is an extent-based filesystem
> like VxFS, which will solve the fragmentation issues that you typically see on
> a UFS filesystem. I suspect that as per your options with advfs, it probably
> depends on how OSF/1..err. Digital UNIX...err.. Tru64nix buffers the domains
> vs. filesets.

I would warn strongly _against_ AdvFS on news or cache servers.

It's a "stable, reliable[1] and flexible" filesystem not a "fast" filesystem.
Sure, it's great, you can grow it, shrink it, turn the computer off and see
it come up with out a fsck, all of that, but it just doesn't perform for news
or caches.

The best options under Tru64 Unix would be:

  1) 6 separate disks in UFS (best for performance and failure modes)

  2) Bind disks together with logical volume management tools and make one UFS
     disk (if you want to feel you're using some Tru64 unix tools to justify
     the money you spent on it...)

David.

[1] theoretically at least. once you've had the kernel crashes every time
    it gets a little corrupt you get bored of it... msfsck ["mega stable" fsck]
    doesn't particularly help either, then you have to go and manually delete
    the inodes. ugh.

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David Luyer
Senior Network Engineer
Pacific Internet (Aust) Pty Ltd
Phone:  +61 3 9674 7525
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