From mboxrd@z Thu Jan 1 00:00:00 1970 From: Petro Subject: Re: [linux-lvm] Problems and questions with LVM on a large raid system. Message-ID: <20030314002507.GE22003@auctionwatch.com> References: <20030312195217.GC18876@auctionwatch.com> <20030312221320.GA15196@gw.silicide.dk> <20030312234520.GA19335@auctionwatch.com> <3E704492.DF386E61@silicide.dk> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: <3E704492.DF386E61@silicide.dk> Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Date: Thu Mar 13 18:25:02 2003 List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@sistina.com On Thu, Mar 13, 2003 at 09:42:58AM +0100, Jon Bendtsen wrote: > Petro wrote: > [cut] > > The production data we gathered showed the opposite--at least for the > > 3ware cards in our environment (we had about 5-8% more overhead > > running the 3ware cards RAID0 than we did running either raw disk > > (cheap IDE cards) or having the 3ware card pretend to be a jbod. > you mean the cpu was more used ? No, meaning we got better overall performance out of Mysql. Fewer running threads, threads connected and disconnected better etc. > > Unfortunately I'll probably not get a chance to redo these. > a shame, because if you dont need snapshots, LVM is a overhead. It may come to that. > > > > Since I need the disk write rate of all 6 drives, I'm *REALLY* hoping > > > > that it's interleaved. > > > sorry... it is not interleaved. > > > JonB > > > ps: how big a partition do you need stripping for? Do you need the > > > advanced LVM stuff, like resize, snapshot... > > I need slightly over 1T of formatted disk space on each system. > > Which means i really need to find a way to send an through > > an ssh session to a telnet window. > may i suggest > http://www.realweasel.com/intro.html > It's a pci GFX<->serial card. > I dont have one, but i want 3. If you buy one... do tell us how it > works. That won't solve the problem. See, my servers are 55 miles down the road. I ssh to a machine that connects to a private network, on which are a bunch of portmasters and APCs. I then telnet to the Portmaster ports, which hook to cua0. It looks basically like I call he "smart hands" at the Colo and talk them through redoing the RAID volumes. -- "On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage