https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095364#M9969 Is it possible to replace a 18 gb 15 k Ultra3 in a raid1 with a new 18 gb 15 k U320 ? Thu, 16 Oct 2003 13:52:31 GMT Richard Crevier 2003-10-16T13:52:31Z https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095364#M9969 Is it possible to replace a 18 gb 15 k Ultra3 in a raid1 with a new 18 gb 15 k U320 ? Thu, 16 Oct 2003 13:52:31 GMT https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095364#M9969 Richard Crevier 2003-10-16T13:52:31Z https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095365#M9970 Maybe mixture of hard disk in a raid will cause some problem. Thu, 16 Oct 2003 16:39:04 GMT https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095365#M9970 vofsky 2003-10-16T16:39:04Z https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095366#M9971 Yes you can replace an Ultra3 with U320 - the U320 will downgrade performance to that of a Ultra3.<BR /><BR />See attached:<BR /><A href="http://h18004.www1.hp.com/products/servers/proliantstorage/drives-enclosures/hotplug-ultra3/questionsanswers.html#11" target="_blank">http://h18004.www1.hp.com/products/servers/proliantstorage/drives-enclosures/hotplug-ultra3/questionsanswers.html#11</A> Fri, 17 Oct 2003 09:06:05 GMT https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095366#M9971 Dave Martin_1 2003-10-17T09:06:05Z https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095367#M9972 The question is what array controller are you using, if it is an ultra 3 controller you will never get u320 performance from it. Fri, 17 Oct 2003 10:40:39 GMT https://community.hpe.com/t5/disk-enclosures/raid-1-with-ultra-3-and-u320/m-p/3095367#M9972 Bradley King 2003-10-17T10:40:39Z