The outer track / inner track performance ratio is more like 40 percent. Recent example is 78MB/s outer and 44MB/s inner for the new Seagate 750MB drive (see http://www.storagereview.com for benchmark results)
- Luke Msg is shrt cuz m on ma treo -----Original Message----- From: Jim Nasby [mailto:[EMAIL PROTECTED] Sent: Thursday, April 26, 2007 03:53 AM Eastern Standard Time To: Pawel Gruszczynski Cc: pgsql-performance@postgresql.org Subject: Re: [PERFORM] What`s wrong with JFS configuration? On Apr 25, 2007, at 8:51 AM, Pawel Gruszczynski wrote: > where u6 stores Fedora Core 6 operating system, and u0 stores 3 > partitions with ext2, ext3 and jfs filesystem. Keep in mind that drives have a faster data transfer rate at the outer-edge than they do at the inner edge, so if you've got all 3 filesystems sitting on that array at the same time it's not a fair test. I heard numbers on the impact of this a *long* time ago and I think it was in the 10% range, but I could be remembering wrong. You'll need to drop each filesystem and create the next one to get a fair comparison. -- Jim Nasby [EMAIL PROTECTED] EnterpriseDB http://enterprisedb.com 512.569.9461 (cell) ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
