filesystem: 12h to delete 32GB of data

[Paul Patterson]

Sorry.  This statement is incorrect.

If you aren't using ZFS, or even a GEOM volume with mirror/RAID5/softup/etc, you cannot make the statement that hardware RAID is faster.  I learned that 3 years ago.

It takes about 30 minutes to mirror 1.5TB on ZFS.  Try that on hardware RAID.

I did the same with 80 GB SATA drives a couple of years ago.  Gmirror killed hardware mirror by 50%

When your processor on your hardware RAID card is junk and you have a kickass processor and good chunk of memory on your main system and decent controller that isn't getting maxed, the "hardware RAID is always faster" paradigm walked out the door a few years ago.

This does not go for EMC, IBM, Hitachi high-end storage arrays where you write to TBs of RAM Cache.

P.




________________________________
From: Wojciech Puchar <wojtek at wojtek.tensor.gdynia.pl>
To: Gary Gatten <Ggatten at waddell.com>
Cc: freebsd-questions at freebsd.org; Benjamin Krueger <benjamin at seattlefenix.net>; Olivier Mueller <om-lists-bsd at omx.ch>; freebsd-performance at freebsd.org; Bill Moran <wmoran at potentialtech.com>
Sent: Wednesday, May 6, 2009 2:31:16 PM
Subject: RE: filesystem: 12h to delete 32GB of data

> It could just be me, but I swear Hardware RAID has been faster for many
> many years, especially with RAID5 arrays - or anything that requires

maybe with RAID5, but using RAID5 today (huge disk sizes, little sense to save on disk space) instead of RAID1/10 doesn't make much sense, as RAID5 is slow on writes by design
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