RAID 10 or RAID 10 + RAID 1 " RAID 10 or RAID 10 + RAID 1 Hello,I need to setup a web server with PostgreSQL. The heaviest application will be product comparisons engine that will analyze 5-10 Million products.I have 6 SAS 15K disks, how should I set them up: RAID 10 on all 6 disks ( OS + Apache + PostgreSQL )RAID 1 on 2 disks ( OS + Apache ) + RAID 10 on 4 disks ( PostgreSQL )What is the recommended stripe size ( The computer is Dell PowerEdge 2950 )Thanks, Miki-- ----------------------------------------... Ben-Nes - Internet Consultant and Director. http://www.epoch.co.il - weaving the Net. Cellular: 054-4848113-------------------------" [1] Quoted from archives.postgresql.org/pgsql-perform... [Published: Tue, 14 Aug 2007 07:21:43 -0300 (ADT)] [631 characters, 101 words] [score: 516]	RAID 1+0 is the Cadillac of RAID | Storage Bits | ZDNet.com " What is RAID 1+0? Sometimes shortened to RAID 10, RAID 1+0 is a particular combination of two different RAID levels: mirroring (RAID 1) and striping (RAID 0). The appeal of RAID 1+0 is simple: mirroring gives you the highest level of availability RAID offers, with the fastest rebuild times when a disk fails; while striping - using the proper chunk size - is the basis for high-performance I/O. . Put the two together and you have the best of both worlds. Until George showed up with his facts. . What about the poor performance George found? We re coming to that, but first a word from our sponsor. . There is an important difference between RAID 1+0 and RAID 0+1 that not everyone appreciates. In RAI" [2] Quoted from http://blogs.zdnet.com/storage/?p=131 [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:54 GMT] [704 characters, 126 words] [score: 177]	Nested RAID levels - Wikipedia, the free encyclopedia " (Thus, RAID 10 is preferable to RAID 0+1 but the administrative advantages of "splitting the mirror" of RAID 1 would be lost. It should be noted, however, that the on disk layout of blocks for RAID 10 and RAID 0+1 setups are identical so these limitations are purely in the software). . Typical RAID 0+1 setup. . A RAID 0+1 (also called RAID 01, not to be confused with RAID 1), is a RAID used for both replicating and sharing data among disks. The difference between RAID 0+1 and RAID 1+0 is the location of each RAID system — RAID 0+1 is a mirror of stripes. The size of a RAID 0+1 array can be calculated as follows where is the capacity of the smallest" [3] Quoted from en.wikipedia.org/wiki/Nested_RAID_lev... [Published: Mon, 28 Jul 2008 22:18:44 GMT] [659 characters, 125 words] [score: 292]

RAID - Wikipedia, the free encyclopedia " For example, RAID 10 (or RAID 1+0) consists of several level 1 arrays of physical drives, each of which is one of the "drives" of a level 0 array striped over the level 1 arrays. It is not called RAID 01, to avoid confusion with RAID 1, or indeed, RAID 01. When the top array is a RAID 0 (such as in RAID 10 and RAID 50) most vendors omit the "+", though RAID 5+0 is clearer. RAID 0+1: striped sets in a mirrored set (minimum four disks; even number of disks) provides fault tolerance and improved performance but increases complexity. The key difference from RAID 1+0 is that RAID 0+1 creates a second striped set to mirror a primary striped set. The array continues to operate with one or more drives failed in the same mirr" [4] Quoted from http://en.wikipedia.org/wiki/RAID [Published: Sat, 02 Aug 2008 00:00:26 GMT] [727 characters, 137 words] [score: 259]	How many disk drives do you need for RAID 10? " What is the minimum number of disk drives you can have in a RAID 10 array? I have read you must have at least four, but our server admin said it is HP's default, and he can do it on just two drives. This is on a Window Server 2003 with a total of four 72 gigabyte (GB) drives in the server and 11 36 GB drives external. To answer how many disk drives are needed for RAID 10: This depends on the storage array vendor's firmware. RAID 10 configurations can be accomplished by mirroring a stripe set, or striping a mirror set. When you stripe a mirror set (my preferred method due to resiliency), you first create two mirror sets and then create a stripe set from the two mirrors (minimum four drives), when you mirror a" [5] Quoted from searchstorage.techtarget.com/expert/K... [Published: Dynamic Content on Sun, 03 Aug 2008 01:53:27 GMT] [718 characters, 138 words] [score: 319]	Storage Advisors » Blog Archive » Yet another RAID-10 vs RAID-5 question " It doesn t sound like I d get any performance boost if I change from my current RAID 10 to RAID 5 at all. Sounds like all the spindles are being used as is? Just wanted to confirm. Your column is awesome by the way. Tom Says: April 17th, 2007 at 10:49 am . John, thanks for the love. . Yeah, your RAID stack should be reading from both drives in the mirror. It usually has an algorithm that makes sure the reads are distributed, such as a simple round robin, or sometimes a which drive is closest to the data algorithm. . Just to be sure, do you see the access lights flickering on all eight drives? If so, you re good to go. If you don t" [6] Quoted from storageadvisors.adaptec.com/2007/04/1... [Published: Dynamic Content on Sun, 03 Aug 2008 00:55:58 GMT] [639 characters, 129 words] [score: 105]

raid 5/4 disks vs raid 10 with 4 disks " Store Question - Post 1 of 7 raid 5/4 disks vs raid 10 with 4 disks We are rebuilding a database server and need to increase performance. we were told to go to raid 10 take off the os/transaction logs to a mirrored drives and to keep the raid to 4 drives. Current setup is raid 5/4 disks, non mirrored for os. Question is,Raid 10 with 4 drives is going to have a major increase in performance over a raid 5? or should we get more drives for the raid 10. Posted: mpell@... Job Role: Networking / LAN Administration Location: E SANDWICH, Massachusetts Member since: 03/04/2001 View Profile Send Message " [7] Quoted from techrepublic.com.com/5208-11184-0.htm... [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:55 GMT] [602 characters, 110 words] [score: 425]	AC&NC | RAID.edu - RAID Levels - RAID Level 10 - RAID 10 " RAID 10 is implemented as a striped array whose segments are RAID 1 arrays . RAID 10 has the same fault tolerance as RAID level 1 . RAID 10 has the same overhead for fault-tolerance as mirroring alone . High I/O rates are achieved by striping RAID 1 segments . Under certain circumstances, RAID 10 array can sustain multiple simultaneous drive failures . Excellent solution for sites that would have otherwise gone with RAID 1 but need some additional performance boost Very expensive / High overhead . All drives must move in parallel to proper track lowering sustained performance . Ver" [8] Quoted from http://www.acnc.com/04_01_10.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:45:29 GMT] [589 characters, 101 words] [score: 426]	What's RAID 10 And Why Should I Use It? " USA (North America) - EnglishEurope - EnglishGermany - DeutschItaly - ItalianoUnited Kingdom - EnglishFrance - Spain - Mexico (Latin America) - Taiwan - Korea - Find a store near you What's RAID 10 And Why Should I Use It? . RAID is, of course, a Redundant Array of Independent (or Inexpensive) Disks. It is a method of storing information on multiple hard disks for greater protection and in some cases performance. Under the RAID umbrella are a number of different storage methods, called levels and numbered from 0 to 9, some of which are more useful than others. . Each level is a distinct method of organizing storage, but some of them can be combined which produces a two-digit RAID level, such as RAID 10, sometimes identified (and more appropriately so) as RAID 1+0. " [9] Quoted from www.acronis.com/resource/tips-tricks/... [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:55 GMT] [776 characters, 134 words] [score: 290]

Adaptec - Which RAID Level is Right for Me? " RAID Level Descriptions RAID 0 (Striping) RAID 1 (Mirroring) RAID 1E (Striped Mirror) RAID 5 (Striping with parity) RAID 5EE (Hot Space) RAID 6 (Striping with dual parity) RAID 10 (Striped RAID 1 sets) RAID 50 (Striped RAID 5 sets) RAID 60 (Striped RAID 6 sets) .   . Data is the most valuable asset of any business today. Lost data means lost business. Even if you backup regularly, you need a fail-safe way to ensure that your data is protected and can be accessed without interruption in the event of an online disk failure. Adding RAID to your storage configurations is one of the most cost-effective ways to maintain both data protection and access. . While a number of companies offer RAID, not all RAID implementations are created equal.With over 24 years of SCSI development experience" [10] Quoted from www.adaptec.com/en-US/_common/cs_2820... [Published: Dynamic Content on Sun, 03 Aug 2008 01:53:01 GMT] [795 characters, 137 words] [score: 225]	RAID 10 | Geek.com " --> --> Search Geek.com Search Prices Search Glossary Search Log In Sign Up--> Register Log In Cancel Forgot Password/Username? Resources --> Popular Archives Forum Menu Geek Shop RAID 10 This form of RAID was originally called RAID 1+0, and is now commonly referred to as RAID 10. This is basically a bunch of RAID 1 drives linked together with RAID 0. Hence you get the speed benefits of RAID 0 with the redundancy benefits of RAID 1. The only problem is that you use a lot of drives to do it. Like RAID 1, you only get half of the space that you've paid for. Of course it may be worth it if you can rest easier at night. RAID 10 is generally a bit faster than RAID 5. Recent Forum Talk Add A " [11] Quoted from http://www.geek.com/raid-10/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:56 GMT] [696 characters, 134 words] [score: 401]	Intel® Matrix Storage Manager - What is RAID 10? " RAID 10 A RAID 10 array uses four hard drives to create a combination of RAID levels 0 and 1 by forming a RAID 0 array from two RAID 1 arrays.Since all of the data on the RAID 0 array is duplicated, the capacity of a RAID 10 array is the size of the RAID 0 array. For example, four 400 GB hard drives in a RAID 10 array will appear as a single 800 GB hard drive to the operating system. . The primary benefit of RAID 10 is that it combines the benefits of RAID 0 performance and RAID 1 fault-tolerance. It provides good data reliability in the case of a single drive failure. When one hard drive fails, all data is immediately available from the other half of the mirror without any impact to the data integrity. In the case of a disk failure, the computer system will remain fully operational to ensure maximum p" [12] Quoted from www.intel.com/support/chipsets/imsm/s... [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:56 GMT] [814 characters, 155 words] [score: 536]

Linux Today - Manage a Linux RAID 10 Storage Server " "Today we ll learn how to monitor, maintain, and make changes in our RAID 10 array. We ll make it bigger, smaller, safely test failure recovery, and set up monitoring and failure notifications. . "In part 2 of this series we learned how to create a RAID 10 array during a clean, new Kubuntu installation. The same method works with all the *buntus, Debian and CentOS 5.1. However, there is an even easier way--the Fedora 8 Anaconda installer supports RAID 10, and it recognizes existing RAID and LVM volumes without having to resort to the hacks we used last week. In fact the Fedora 8 graphical installer is sleek and fast; in my opi" [13] Quoted from www.linuxtoday.com/storage/2008030501... [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:56 GMT] [635 characters, 114 words] [score: 323]	RAID Levels 0+1 (01) and 1+0 (10) " RAID 01 is a mirrored configuration of two striped sets; RAID 10 is a stripe across a number of mirrored sets. RAID 10 and 01 have been increasing dramatically in popularity as hard disks become cheaper and the four-drive minimum is legitimately seen as much less of an obstacle. RAID 10 provides better fault tolerance and rebuild performance than RAID 01. Both array types provide very good to excellent overall performance by combining the speed of RAID 0 with the redundancy of RAID 1 without requiring parity calculations. . . This illustration shows how files of different sizes are distributed between the drives on an eight-disk RAID 0+" [14] Quoted from www.pcguide.com/ref/hdd/perf/raid/lev... [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:57 GMT] [645 characters, 108 words] [score: 266]	Intel X48/P45 RAID 10 question " Hi: I am trying to decide whether to use RAID 0 or RAID 10 for my new system. In page 21 of the TH review for the P45 chipset (http://www.tomshardware.com/reviews/intel-p45-chipset,1961-21.html), the chart mentions RAID 0+1. My understanding is that the Intel Matrix RAID supports RAID 10, which is RAID 1+0. Is RAID 0+1 a typo in the review? Does the ICH10R in P45 support RAID 0+1 at all? The review also shows the read throughput to be 77.7MB/s and the write throughput to be 140.9MB/s for the 4-drive RAID 0+1. The reviewer explains that Intel still does not use both mirrors of a RAID 1 (or in this case RAID 0+1) to sp" [15] Quoted from www.tomshardware.com/forum/246451-32-... [Published: Tue, 29 Jul 2008 21:03:32 GMT] [625 characters, 113 words] [score: 347]

References:
	[1]: Quoted from RAID 10 or RAID 10 + RAID 1 found at http://archives.postgresql.org/pgsql-performance/2007-08/msg00149.php [Published: Tue, 14 Aug 2007 07:21:43 -0300 (ADT)] [631 characters, 101 words]
	[2]: Quoted from RAID 1+0 is the Cadillac of RAID | Storage Bits | ZDNet.com found at http://blogs.zdnet.com/storage/?p=131 [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:54 GMT] [704 characters, 126 words]
	[3]: Quoted from Nested RAID levels - Wikipedia, the free encyclopedia found at http://en.wikipedia.org/wiki/Nested_RAID_levels [Published: Mon, 28 Jul 2008 22:18:44 GMT] [659 characters, 125 words]
	[4]: Quoted from RAID - Wikipedia, the free encyclopedia found at http://en.wikipedia.org/wiki/RAID [Published: Sat, 02 Aug 2008 00:00:26 GMT] [727 characters, 137 words]
	[5]: Quoted from How many disk drives do you need for RAID 10? found at http://searchstorage.techtarget.com/expert/KnowledgebaseAnswer/0,289625,sid5_gci1156053,00.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:53:27 GMT] [718 characters, 138 words]
	[6]: Quoted from Storage Advisors » Blog Archive » Yet another RAID-10 vs RAID-5 question found at http://storageadvisors.adaptec.com/2007/04/17/yet-another-raid-10-vs-raid-5-question/ [Published: Dynamic Content on Sun, 03 Aug 2008 00:55:58 GMT] [639 characters, 129 words]
	[7]: Quoted from raid 5/4 disks vs raid 10 with 4 disks found at http://techrepublic.com.com/5208-11184-0.html?forumID=55&threadID=183003 [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:55 GMT] [602 characters, 110 words]
	[8]: Quoted from AC&NC | RAID.edu - RAID Levels - RAID Level 10 - RAID 10 found at http://www.acnc.com/04_01_10.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:45:29 GMT] [589 characters, 101 words]
	[9]: Quoted from What's RAID 10 And Why Should I Use It? found at http://www.acronis.com/resource/tips-tricks/2005/whats-raid-10.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:55 GMT] [776 characters, 134 words]
	[10]: Quoted from Adaptec - Which RAID Level is Right for Me? found at http://www.adaptec.com/en-US/_common/cs_2820sa/_learn/RAID_level_compar_wp.htm [Published: Dynamic Content on Sun, 03 Aug 2008 01:53:01 GMT] [795 characters, 137 words]
	[11]: Quoted from RAID 10 | Geek.com found at http://www.geek.com/raid-10/ [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:56 GMT] [696 characters, 134 words]
	[12]: Quoted from Intel® Matrix Storage Manager - What is RAID 10? found at http://www.intel.com/support/chipsets/imsm/sb/CS-020655.htm [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:56 GMT] [814 characters, 155 words]
	[13]: Quoted from Linux Today - Manage a Linux RAID 10 Storage Server found at http://www.linuxtoday.com/storage/2008030501226OSHLSV [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:56 GMT] [635 characters, 114 words]
	[14]: Quoted from RAID Levels 0+1 (01) and 1+0 (10) found at http://www.pcguide.com/ref/hdd/perf/raid/levels/multLevel01-c.html [Published: Dynamic Content on Sun, 03 Aug 2008 01:50:57 GMT] [645 characters, 108 words]
	[15]: Quoted from Intel X48/P45 RAID 10 question found at http://www.tomshardware.com/forum/246451-32-intel-raid-question [Published: Tue, 29 Jul 2008 21:03:32 GMT] [625 characters, 113 words]
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	RAID 10
Page			Popularity
	1.	RAID 10	366
	2.	RAID 10 in context with: +2003+answer+gigabyte+least+many+needed+preferred+resiliency+default+said+depends+accomplished+admin+then+external+total+firmware+vendor+window	40
	3.	RAID 10 in context with: +postgresql+apache+application+cellular+comparisons+consultant+dell+director+engine+epoch+heaviest+hello+2950+internet+michael+miki+million+4848113+poweredge+product+products+recommended+weaving+analyze	32
	4.	RAID 10 in context with: +george+everyone+facts+fastest+found+about+gives+highest+important+appeal+offers+particular+appreciates+poor+availability+shortened+showed+sponsor+basis+best+times+until+using+chunk+word+worlds+coming	24
	5.	RAID 10 in context with: +blocks+calculated+confused+follows+identical+among+layout+limitations+noted+administrative+preferable+purely+replicating+setups+sharing+smallest+software+splitting+stripes+these+thus+advantages+typical+where	15
	6.	RAID 10 in context with: +question+increase+going+administration+keep+logs+major+massachusetts+member+message+2001+mpell+networking+post+posted+profile+database+rebuilding+role+sandwich+send+take+told+transaction+view+were	1
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