tag:blogger.com,1999:blog-5976686513564131325.post1136145627420529766..comments2024-03-17T15:34:05.492-06:00Comments on MPECS Inc. Blog: Webinar was very successful Thanks!Philip Elder Cluster MVPhttp://www.blogger.com/profile/06082028960643490292noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5976686513564131325.post-40290127625767138362008-11-05T22:43:00.000-07:002008-11-05T22:43:00.000-07:00Chris,Thanks for that. I will dive into the Wiki e...Chris,<BR/><BR/>Thanks for that. I will dive into the Wiki entry to see if I can wrap my brain around the differences.<BR/><BR/>PhilipPhilip Elder Cluster MVPhttps://www.blogger.com/profile/06082028960643490292noreply@blogger.comtag:blogger.com,1999:blog-5976686513564131325.post-71950544475024139912008-11-04T06:28:00.000-07:002008-11-04T06:28:00.000-07:00I don't have a handy reference, but 1+0 is a strip...I don't have a handy reference, but 1+0 is a stripe of two mirror sets (mirror, then add stripe is how I remember it) and is most commonly known as RAID-10.<BR/><BR/>0+1 is a mirror of two stripe sets (stripe, then add mirror) and is less commonly used than 1+0. 0+1 is more common when the controller supports duplexing, whereby you can mirror the stripe sets across controllers. 5+1 (RAID-51) is also a popular choice for duplexing.<BR/><BR/>The degradation and subsequent rebuild of 1+0 and 0+1 is also quite different. A single drive failure of 1+0 means that only two drives are involved in a rebuild (the failed drive and its mirrored partner), where a single drive failure in 0+1 means that the stripe set is taken offline, leaving a single stripe set for operation and rebuild. That is, all four drives are used in a rebuild.<BR/><BR/>Ah, found a good one - see the Wikipedia entry on <A HREF="http://en.wikipedia.org/wiki/Nested_RAID_levels" REL="nofollow">Nested RAID Levels</A>stryqxhttps://www.blogger.com/profile/11725668205462749500noreply@blogger.com