Re: asm on san
Date: Mon, 15 Dec 2008 12:49:42 -0800
> On Dec 12, 3:07 pm, DA Morgan <damor..._at_psoug.org> wrote:
>> It is more than just when it is in degraded mode. RAID5 has substantial >> negative impacts on performance all of the time the system is not idle. >> >> James Morle, at UKOUG, pointed out that a similar issue exists with the >> new Solid State drives too making them problematic for small writes. >> >> If you shackle a system with RAID5 today, and later need the horsepower, >> you will find it almost impossible, from a practical standpoint, to get >> off RAID5. Better to say NO! now than later. >> >> If they can't afford the disk ... the data isn't that important. >> >> This is not to say backups couldn't be sitting on RAID5. But operational >> datafiles? redo log files? No way.
> Lots of posturing here ... wonder if anyone has ever posted that RAID
> 5 is fine and running on Apple storage hardware is what everyone is
> going to ...
> Doesn't smell good from certain contributors to this thread ...
Someone did. That someone also posted the metrics in a White Paper. Someone else, as I clearly recall, argued that the numbers were wrong. Are you planning on falling on one side of the fence or on the fence posts with this one?
-- Daniel A. Morgan Oracle Ace Director & Instructor University of Washington damorgan_at_x.washington.edu (replace x with u to respond) Puget Sound Oracle Users Group www.psoug.orgReceived on Mon Dec 15 2008 - 14:49:42 CST