filesystem: 12h to delete 32GB of data
pathiaki2 at yahoo.com
Thu May 7 02:05:19 UTC 2009
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.
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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