Re: Oracle and Disk Mirroring
From: John OBrien <RAID7_at_world.std.com>
Date: Thu, 4 Aug 1994 18:33:43 GMT
Message-ID: <Cu0ww7.2ss_at_world.std.com>
Date: Thu, 4 Aug 1994 18:33:43 GMT
Message-ID: <Cu0ww7.2ss_at_world.std.com>
David Gimpelvich wrote:
>RAID 5 on HP 9000...The RAID user eas anticipating degradation.
That's correct. The RAID 5 architecture dates back to the mid 80s and is not capable of matching the performance of modern Unix systems. To get high speed I/O, well above that of a disk single-spindle rate, you need an asynchronous architecture, an embedded OS, and individual caches (eg 128 KB) for each disk in the disk array platform. This is the sort of architecture Wall Street firms, for example, require with their big RDBMSs, since speed is critical in that competitive industry.
John O'Brien Tel. 603-880-3005 Storage Computer Corp. Fax. 603-889-7232 11 Riverside Street Nashua, NH 03062 European headquarters: Wiesbaden, Germany United States Tel. 49 611 30 82 30 6 -----------------------"Protect Your Writes"-------------------------Received on Thu Aug 04 1994 - 20:33:43 CEST