RE: RE: Raw partition Vs File System
Hi Bill, No luck contacting Bert. My guess is that he did not have a very big SGA, so there was plenty of his 2G of RAM available for filesystem caching. For example, if Oracle had 128M for the shared pool and 128M for its buffer cache (as at the end of his previous article in the series), that leaves about 1.7G for filesystem caching. So file system based tests would get the benefit of 1.7G of cache, whereas raw tests would only get the benefit of 128M of cache. To construct a fair test, it would be necessary to give Oracle 1.7G of db_block_buffers. In the article Bert says that he doubled db_block_buffers, but unless going from about 600M to about 1.2G, then it was not a level playing field. Unfortunately, he does not give those numbers. @ Regards, @ Steve Adams @ http://www.ixora.com.au/ - For DBAs @ http://www.christianity.net.au/ - For all -Original Message- Sent: Tuesday, 20 November 2001 21:07 To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Hi Steve, Did you manage to contact Bert? Would you be willing to let us know what you think was wrong with the test anyway? Many thanks - Bill. Hi All, Does anyone have an email address for Bert? I looked for his email address when I first read that article a week ago, but did not find one. I think I know what was wrong with his test, but it is hard to be sure because he left out a lot of the details. @ Regards, @ Steve Adams @ http://www.ixora.com.au/ - For DBAs @ http://www.christianity.net.au/ - For all -Original Message- Sent: Friday, 9 November 2001 21:20 To: Multiple recipients of list ORACLE-L Did anyone read Bert Scalzo's article in Pipeline Newsletter this month (http://www.revealnet.com/newsletter-v2/linux2.html)? He was benchmarking various filesystems under Linux (EXT2, EXT3, Reiser, IBM JFS and RAW). I was suprised (and so was he) to see worst performance on RAW devices. I presume this is a Linux-specific issue: can anyone suggest why RAW is so poor on Linux (or want to contest the results?!) Thanks - Bill. At 01:29 09/11/01 -0800, you wrote: If you're using a volume manager (veritias, or disk suite), then raw is pretty much just as easy as file systems. You could always do this incrementally - for example, high io stuff (typically redo, temp, possibly rollback) on raw, and all the rest of file systems etc. hth connor --- Vasu Ramasamy [EMAIL PROTECTED] wrote: Hello Gurus, I am trying to install Oracle Server in the environment as given below. I am in the processes of laying out Physical Database layout. I would like to know the pros and cons of going with Raw partition. The environment : Solaris 2.6 Oracle 8.1.7 Size of database - 60GB No. of tables - 3000 (approx.) Max size of few tables - 3 GB to 5 GB. Thanks for your help. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Vasu Ramasamy INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue __ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Intasys Billing Technologies Ltd. www.intasysbilling.com 74 Commercial Street, Commercial Quay, Leith, Edinburgh EH6 6LX tel (0)131 625 8200 fax (0)131 625 8201 email [EMAIL PROTECTED] -- Please see the official ORACLE-L FAQ: http://www.orafaq.com --
RE: RE: Raw partition Vs File System
Bill, There is a chance that Linux is using direct io (most Unixes have some variant of this) and that -- at least for some I/O -- that the OS buffer cache is bypassed. Food for thought. Ross -Original Message- Sent: Tuesday, November 20, 2001 6:05 AM To: Multiple recipients of list ORACLE-L Hi Steve, Did you manage to contact Bert? Would you be willing to let us know what you think was wrong with the test anyway? Many thanks - Bill. Hi All, Does anyone have an email address for Bert? I looked for his email address when I first read that article a week ago, but did not find one. I think I know what was wrong with his test, but it is hard to be sure because he left out a lot of the details. @ Regards, @ Steve Adams @ http://www.ixora.com.au/ - For DBAs @ http://www.christianity.net.au/ - For all -Original Message- Sent: Friday, 9 November 2001 21:20 To: Multiple recipients of list ORACLE-L Did anyone read Bert Scalzo's article in Pipeline Newsletter this month (http://www.revealnet.com/newsletter-v2/linux2.html)? He was benchmarking various filesystems under Linux (EXT2, EXT3, Reiser, IBM JFS and RAW). I was suprised (and so was he) to see worst performance on RAW devices. I presume this is a Linux-specific issue: can anyone suggest why RAW is so poor on Linux (or want to contest the results?!) Thanks - Bill. At 01:29 09/11/01 -0800, you wrote: If you're using a volume manager (veritias, or disk suite), then raw is pretty much just as easy as file systems. You could always do this incrementally - for example, high io stuff (typically redo, temp, possibly rollback) on raw, and all the rest of file systems etc. hth connor --- Vasu Ramasamy [EMAIL PROTECTED] wrote: Hello Gurus, I am trying to install Oracle Server in the environment as given below. I am in the processes of laying out Physical Database layout. I would like to know the pros and cons of going with Raw partition. The environment : Solaris 2.6 Oracle 8.1.7 Size of database - 60GB No. of tables - 3000 (approx.) Max size of few tables - 3 GB to 5 GB. Thanks for your help. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Vasu Ramasamy INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue __ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Intasys Billing Technologies Ltd. www.intasysbilling.com 74 Commercial Street, Commercial Quay, Leith, Edinburgh EH6 6LX tel (0)131 625 8200 fax (0)131 625 8201 email [EMAIL PROTECTED] -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Bill Buchan INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Steve Adams INET: [EMAIL
