From: "Jeff Shervey" Subject: Re: Raid and Mirroring Redo logs-Newbie Date: 1998/02/02 Message-ID: <6b4lae$g7@news.us.landisstaefa.com>#1/1 References: <34d3ce7f.0@news1.ibm.net> X-MimeOLE: Produced By Microsoft MimeOLE V4.71.1712.3 Organization: Landis & Staefa Newsgroups: comp.databases.oracle.server You need to have a mix of RAID-5 and RAID-1 or RAID-0+1... Have redo logs on RAID-1....the intense write nature of redo's is not optimal on RAID-5 where writing data invokes a penalty. Consider moving rollback segments and TEMP tablespace also on RAID-1, same with Archive logs. Leave everything else on RAID-5. Mirroring redo's would be nice to do...RAID-5 array's do fail if more than 1 drive takes a dive. Don't rely too much on RAID....you may never crash because of disk crashes but Oracle can still corrupt some data blocks from time to time, causing a restore. RAID 0+1 is the best all around RAID config...I would consider this bigtime if I knew that 2000 users are able to login at any one time. DKite wrote in message <34d3ce7f.0@news1.ibm.net>... >I am relatively at Oracle. I have 2 questions. > >1. We have an HP with raid 5. My Oracle instructor suggested that redo >logs should be mirrored within Oracle. Is this really needed with raid? > >2. The system will eventually have 2000 users. Most of which will have a >login, but may not being actively working at the one time. Are there any >rules to determine whether to run a multithreaded or 'normal' Oracle >instance? > >Thanks in advance > >-- > > >