Diferents RAID levels.
Isidre Pons Roca asked about the difference between RAID 0+1 and RAID 10 for Informix 9.24 on Solaris 2.6. Art S. Kagel explained that RAID 01 mirrors two stripe sets while RAID 10 stripes across mirrored pairs. Performance is equal, but RAID 10 has much better safety and recovery, particularly if a second drive fails during recovery. Thomas Parsli gave reference links.
Auto-generated by Claude from the posts below — may be imperfect; read the full thread.
Hi gurus. Platform : Informix 9.24.UC1 on Solaris 2.6 We are planning how can increase the performance of our storage system and do it more secure. Art, Obnoxio and others say "never use RAID 5 (this message repeat n+1 times) USE RAID 10" but i have a lot of doubts (not about RAID5) about the diference between RAID 0+1 and RAID 10. Can anyone explain this diferences? Thanks in advance. PS Sorry for my poor english. --------------------------------------- Isidre PONS ROCA BASE - Gesti' d'Ingressos Locals (Diputacio de Tarragona) Servei de Sistemes d'Informacio Av President Lluis Companys 12-C 43005 - Tarragona SPAIN Tel # +34 977 236731 Fax # +34 977 227302 http://www.altanet.org ipons@dtgna.altanet.org ---------------------------------------
"Isidre PONS ROCA" <ipons@dtgna.altanet.org> writes: > Hi gurus. > > Platform : Informix 9.24.UC1 on Solaris 2.6 > > We are planning how can increase the performance of our storage system and do it more secure. > Art, Obnoxio and others say "never use RAID 5 (this message repeat n+1 times) USE RAID 10" but i have a lot of > doubts (not about RAID5) about the diference between RAID 0+1 and RAID 10. > > Can anyone explain this diferences? > > Thanks in advance. > > PS Sorry for my poor english. And what parts of Art's reving didn't you understand? How about this: http://x68.deja.com/[ST_rn=ps]/getdoc.xp?AN=579931527&CONTEXT=973516005.985792521&hitnum=2 http://x68.deja.com/[ST_rn=ps]/getdoc.xp?AN=626027385&CONTEXT=973516005.985792521&hitnum=7 Thomas
RAID01 (or RAID 0+1) is mirroring two stripe sets while RAID10 (or RAID 1+0) is stripping two or more mirrored pairs. Performance for both is normally equal but recovery and safety are MUCH better for RAID10 than for RAID01. See my anti-RAID5 tome that Obnoxio posted last week or so for details of why RAID10 is superior protection and recovery. Art S. Kagel Isidre PONS ROCA wrote: > > Hi gurus. > > Platform : Informix 9.24.UC1 on Solaris 2.6 > > We are planning how can increase the performance of our storage system and do it more secure. > Art, Obnoxio and others say "never use RAID 5 (this message repeat n+1 times) USE RAID 10" but i have a lot of > doubts (not about RAID5) about the diference between RAID 0+1 and RAID 10. > > Can anyone explain this diferences? > > Thanks in advance. > > PS Sorry for my poor english. > > --------------------------------------- > Isidre PONS ROCA > BASE - Gestió d'Ingressos Locals > (Diputacio de Tarragona) > Servei de Sistemes d'Informacio > Av President Lluis Companys 12-C > 43005 - Tarragona > SPAIN > Tel # +34 977 236731 > Fax # +34 977 227302 > http://www.altanet.org > ipons@dtgna.altanet.org > ---------------------------------------
Can you explain the difference in RAID-10 and RAID-01 in more detail. -- Jay Aymond Community Coffee Art S. Kagel <kagel@bloomberg.net> wrote in message news:3A09D90F.8FDF4928@bloomberg.net... > RAID01 (or RAID 0+1) is mirroring two stripe sets while RAID10 (or RAID 1+0) > is stripping two or more mirrored pairs. Performance for both is normally > equal but recovery and safety are MUCH better for RAID10 than for RAID01. > See my anti-RAID5 tome that Obnoxio posted last week or so for details of > why RAID10 is superior protection and recovery. > > Art S. Kagel > > Isidre PONS ROCA wrote: > > > > Hi gurus. > > > > Platform : Informix 9.24.UC1 on Solaris 2.6 > > > > We are planning how can increase the performance of our storage system and do it more secure. > > Art, Obnoxio and others say "never use RAID 5 (this message repeat n+1 times) USE RAID 10" but i have a lot of > > doubts (not about RAID5) about the diference between RAID 0+1 and RAID 10. > > > > Can anyone explain this diferences? > > > > Thanks in advance. > > > > PS Sorry for my poor english. > > > > --------------------------------------- > > Isidre PONS ROCA > > BASE - Gesti' d'Ingressos Locals > > (Diputacio de Tarragona) > > Servei de Sistemes d'Informacio > > Av President Lluis Companys 12-C > > 43005 - Tarragona > > SPAIN > > Tel # +34 977 236731 > > Fax # +34 977 227302 > > http://www.altanet.org > > ipons@dtgna.altanet.org > > ---------------------------------------
"Jay Aymond" <jaymond@communitycoffee.com> writes: > Can you explain the difference in RAID-10 and RAID-01 in more detail. How about: http://www.pcguide.com/ref/hdd/perf/raid/levels/multXY-c.html Thomas
If you mean the physical differences, it's not that complicated: RAID01 - Take N/2 identical drives and create a stripe set (RAID0), take another N/2 identical drives and create a second stripe set. Now mirror (RAID1) one onto the other and voila, RAID01. See RAID0 first then RAID1 hence RAID01. RAID10 - Take N identical drives 2 at a time and mirror each drive to another, RAID1. Now create a stripe (RAID0) from the N/2 mirrored pairs and voici, RAID10. Get it RAID1 then RAID0 hence RAID10. If you mean the operational differences, I do and I have posted such descriptions, about 4 times a year for several years now. Look in the FAQ, look at the IIUG Archive of this newsgroup (indeed Obnoxio posted a copy about a week or so ago). Bottom line? RAID01 if ANY drive fails on the other side of the mirror while recovering from a crash you are hosed and recovery can take many times longer than for RAID10. For RAID10 recovery is faster, overhead during recovery is lower, 1/N of the throughput reduction during recovery compared to ANY other RAID configuration with as wide a stripe. If you are careful to build your RAID10 with each side of the mirror on a separate power supply and controller from its mirror and selected from a different manufacturer's lot number than its mirror catastrophic data loss is nearly impossible. Art S. Kagel Jay Aymond wrote: > > Can you explain the difference in RAID-10 and RAID-01 in more detail. > > -- > Jay Aymond > Community Coffee > Art S. Kagel <kagel@bloomberg.net> wrote in message > news:3A09D90F.8FDF4928@bloomberg.net... > > RAID01 (or RAID 0+1) is mirroring two stripe sets while RAID10 (or RAID > 1+0) > > is stripping two or more mirrored pairs. Performance for both is normally > > equal but recovery and safety are MUCH better for RAID10 than for RAID01. > > See my anti-RAID5 tome that Obnoxio posted last week or so for details of > > why RAID10 is superior protection and recovery. > > > > Art S. Kagel > > > > Isidre PONS ROCA wrote: > > > > > > Hi gurus. > > > > > > Platform : Informix 9.24.UC1 on Solaris 2.6 > > > > > > We are planning how can increase the performance of our storage system > and do it more secure. > > > Art, Obnoxio and others say "never use RAID 5 (this message repeat n+1 > times) USE RAID 10" but i have a lot of > > > doubts (not about RAID5) about the diference between RAID 0+1 and RAID > 10. > > > > > > Can anyone explain this diferences? > > > > > > Thanks in advance. > > > > > > PS Sorry for my poor english. > > > > > > --------------------------------------- > > > Isidre PONS ROCA > > > BASE - Gestió d'Ingressos Locals > > > (Diputacio de Tarragona) > > > Servei de Sistemes d'Informacio > > > Av President Lluis Companys 12-C > > > 43005 - Tarragona > > > SPAIN > > > Tel # +34 977 236731 > > > Fax # +34 977 227302 > > > http://www.altanet.org > > > ipons@dtgna.altanet.org > > > ---------------------------------------