Volker Armin Hemmann <volkerar...@googlemail.com> wrote:
> Am 17.09.2013 09:20, schrieb Grant:
> > I'm convinced I need 3-disk RAID1 so I can lose 2 drives and keep
> > running. I'd also like to stripe for performance, resulting in
> > RAID10. It sounds like most hardware controllers do not support
> > 6-disk RAID10 so ZFS looks very interesting.
> >
> > Can I operate ZFS RAID without a hardware RAID controller?
> >
> > >From a RAID perspective only, is ZFS a better choice than conventional
> > software RAID?
> >
> > ZFS seems to have many excellent features and I'd like to ease into
> > them slowly (like an old man into a nice warm bath). Does ZFS allow
> > you to set up additional features later (e.g. snapshots, encryption,
> > deduplication, compression) or is some forethought required when first
> > making the filesystem?
> >
> > It looks like there are comprehensive ZFS Gentoo docs
> > (http://wiki.gentoo.org/wiki/ZFS) but can anyone tell me from the real
> > world about how much extra difficulty/complexity is added to
> > installation and ongoing administration when choosing ZFS over ext4?
> >
> > Performance doesn't seem to be one of ZFS's strong points. Is it
> > considered suitable for a high-performance server?
> >
> > http://www.phoronix.com/scan.php?page=news_item&px=MTM1NTA
> >
> > Besides performance, are there any drawbacks to ZFS compared to ext4?
> >
> do yourself three favours:
>
> use ECC ram. Lots of it. 16GB DDR3 1600 ECC ram cost you less than 170€.
> And it is worth it. ZFS showed me just how many silent corruptions can
> happen on a 'stable' system. Errors never seen neither detected thanks
> to using 'standard' ram.
>
> turn off readahead. ZFS' own readahead and the kernel's clash - badly.
> Turn off kernel's readahead for a visible performance boon.
>
> use noop as io-scheduler.
How do you turnoff read ahead?
--
Your life is like a penny. You're going to lose it. The question is:
How do
you spend it?
John Covici
cov...@ccs.covici.com
