Check the archives for the last couple of weeks, I posted some benchmarks from a client's RAID10 4-disk array.
Baron On Fri, Mar 6, 2009 at 8:21 PM, <dbrb2002-...@yahoo.com> wrote: > Thanks Baron... > > Also, curious question.. as you might have used what is called GOOD hw > configurarion with RAID 5/10 .. so whats the typical IO (rnd rw) that you > archive/expect on high trafficked sites ? > > --- On Wed, 3/4/09, Baron Schwartz <ba...@xaprb.com> wrote: > > From: Baron Schwartz <ba...@xaprb.com> > Subject: Re: MySQL Log and Data directories > To: dbrb2002-...@yahoo.com > Cc: mysql@lists.mysql.com > Date: Wednesday, March 4, 2009, 11:40 AM > > On Wed, Mar 4, 2009 at 1:22 PM, <dbrb2002-...@yahoo.com> wrote: >> On a high read/write load.. is it good to split log (binlogs, innodb txn >> logs) and data (all tables, innodb tablespace) in different partitions ? >> >> Anybody had any experience ? >> >> For example; out of 25 disks array with 142GB 10000rpm... I would like to >> keep few disks to logs and rest to data .. is it advised or better to keep >> everything in spool so that all spindles can be efficiently managed... >> >> Thanks in advance > > There are exceptions to everything I'm about to write, but: > > Under high read loads, there is no benefit. Under high write loads, > there might be. With this many disks, yes. With fewer disks, the > relatively trivial sequential log writes will not actually degrade > performance much, and the non-trivial performance impact of stealing > disks away and dedicating them to the logging workload will make a lot > of difference. > > The real answer is always -- run a benchmark and see. Does the > improvement offset things like any kind of penalty the OS imposes on > you (e.g. LVM can't take a snapshot across multiple volumes)? > > > -- > Baron Schwartz, Director of Consulting, Percona Inc. > Our Blog: http://www.mysqlperformanceblog.com/ > Our Services: http://www.percona.com/services.html > -- Baron Schwartz, Director of Consulting, Percona Inc. Our Blog: http://www.mysqlperformanceblog.com/ Our Services: http://www.percona.com/services.html -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
