On Thu, Jun 15, 2000 at 07:46:03PM +0100, Paul Jakma wrote:
> > You have an extra column's worth of data to write - the parity info.
> for which you have an extra disk. so forget that argument.
> > That's 50% more data for a 3-column RAID5 than for a mirror.
> no, the 3disk RAID5 has double the read throughput of a 2 disk RAID1.
Yeah, I'll go along with this. A good (*) raid5 card with plenty of
writeback battery-backed cache (**) is better (***) than anything else.
Benchmark, benchmark, benchmark! :-)
(*) One that doesn't bother doing any reads when it's writing to a
(**) ...and that has enough cache to minimise the effects of /having/
to write smaller fragments.
(***) Except perhaps in degraded and rebuild modes. And for certain
highly specialised applications, like ... um ... sorry, I can't
think of any. :-(
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!