Tim, Are you suggesting that HW RAID 1 with SW RAID 0 is a better combination than HW RAID 1 and HW RAID 0?
If so, why? Jared On Tue, 2003-08-12 at 21:59, Tim Gorman wrote: > 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). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jared Still 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).
