Software RAID-1 can mirror across controllers, channels, and storage arrays, should any of those be considered a single-point-of-failure...
The combination of HW RAID-1 and SW RAID-0 is optimal for performance, if the HW supports it... on 8/12/03 9:04 PM, Matthew Zito at [EMAIL PROTECTED] wrote: > > Actually, as of AIX 4.3.3, it does support 0+1 for LVs, but that wasn't the > scenario I was imagining. I was envisioning creating a set of RAID-1 raid > groups on the storage array and then striping across them using the LVM. > RAID-1 is one of those things that I feel is generally better to let your > storage array handle - software RAID-1 requires your host to generate double > the I/Os and should one side of the pair fail, hardware arrays tend to > recover more gracefully than software raid. RAID-0, by comparison, is very > easy. > > Thanks, > Matt > > > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > Sent: Tuesday, August 12, 2003 9:44 PM > > >> The AIX LVM supports RAID-0 and RAID-1, but not together, as you state. >> >> However, a rude form of RAID-0 can be achieved by specifying "max > allocation >> policy", which will cause round-robin distribution of physical extents > (PEs) >> across a list of physical volumes (PVs), thereby approximately RAID-0 at a >> large granularity (i.e. 4M, 8M, 16M per "stripe"). Still, it beats the > heck >> out of RAID5... >> >> >> on 8/12/03 12:24 PM, Schauss, Peter at [EMAIL PROTECTED] wrote: >> >>> Our hardware people tell me that our disk array will not support Raid > 10. >>> Given a choice between Raid 1 or 5 for my tablespaces, which one >>> is best? This is Oracle 8.1.7 on AIX 4.3.3. The application will >>> have a mix of read and write activity. >>> >>> Thanks, >>> Peter Schauss >> >> -- >> Please see the official ORACLE-L FAQ: http://www.orafaq.net >> -- >> Author: Tim Gorman >> INET: [EMAIL PROTECTED] >> >> Fat City Network Services -- 858-538-5051 http://www.fatcity.com >> San Diego, California -- Mailing list and web hosting services >> --------------------------------------------------------------------- >> 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.net -- Author: Tim Gorman INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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).
