A few MS-Exchange and Oracle admins also recommended RAID 10 for both safety and performance over RAID 5. A RAID 5 spreads data across the drives like most other RAID types, but on every sweep (stripe) of the drives, one of the drives is given a small nugget of data called ‘parity data’. I personally use the RAID 1 / RAID 5 combo that was mentioned earlier for most server installs. Link. I keep this point in mind when procuring enterprise solutions. Finally what is the cost of lost business if data is unrecoverable? We can put apps in the cloud, but our data is far too important to entrust to some company out to make money off hosting it. In fact it may save you money especially when you consider the performance degradation associated with RAID 5 and high random read / write IO databases such as Exchange. Is RAID 10 the same as RAID 01? What is impossible/nearly impossible to crack today may not beso hard tomorrow or within a relatively short period of time down the road. It looks that with increasing HDD capacities RAID 5 will be not able to provide data safety…, Very good article: Why RAID 5 stops working in 2009 at blogs.zdnet.com/storage/?p=162&tag=nl.e539. A block size of 4 sectors provides data for a complete stipe, that is 4 data sectors and one parity. For more details, please feel free to comment and post on my article, When RAID 10 Is Worth The Economic Cost Link. You could have two servers with this configuration for the price of one server using a hardware RAID/SAS configuration. Hi I was reading all the info here and I appreciate many analytical minds working hard keep it up. in raid 10 if your system and not the drives goes on you than all your drives could be corrupted by the system. You’ve got that RAID10 graphic at the top backwards. If I chose RAID 10, it would have to be the mirror to the disk that already failed (only about a 4% chance, and you can further reduce the odds for RAID 10 failure by creating mirrored pairs with disks from different manufacturers). I’ve never used any Jetstor products but their I’ve referenced their RAID.EDU website numerous times to students who want to learn more about the different RAID solutions. – Posts that do not take in to account sheer scale of implementation are simply flaming articles. No one has EVER said that 10 or 50 are implying “better” just because they are a higher number. This is just in YOUR little head my friend, as we all know that already, so you’re wasting everyone’s time here by adding stupid non-issue points like that. It’s got to touch hardware somewhere. – There are situations where it is NOT advisable to deploy a parity based RAID. Sorry for being so critical but I wouldn’t trust the “word” of anyone without there being good proof. A power failure can damage the File Systems on most RAIDs. If I am reading this correct, then this article says that a raid 1+0 array offer 4x proformance, when you only have 4 drives. Reconstruction next: of course reconstruction will take longer with RAID-DP. Get a clue and learn to let go of your antiquated, failure-laden backup technology. VonSkippy, you do know that SCSI drives are obsolete? http://www.cyberciti.biz/faq/what-happens-when-hard-disk-fails-in-raid-5/. Let’s not make silly mantras like we own stock in RAID 10. In real world observable conditions, which raid solution will give me the most performance (I’m thinking fast write speeds), while protecting against total data loss being able to at least temporarily tolerate the loss of up to 2 drives. RAID 10 = Combining features of RAID 0 + RAID 1. RAID (redundant array of independent disks) is a setup consisting of multiple disks for data storage. The RAID 0 offers great benefits for work operations where better speed and performance are key, such as gaming, video streaming, and cache purposes. It is RAID 1+0. Why waste everyone else’s time dismantling other people’s correct usage! One advantage to Raid-10 is that if a drive does go down, you won’t notice a performance hit as you would with a Raid-5 while it has to rebuild the array. In a corporate environment, or for a HDD-intensive application, this mean the system can’t be used – not good. s = size of individual disk, RAID 5 cost: C((S/s) + 1) Yes, it does cost money to secure YOUR data. 24 votes, 93 comments. I do appreciate the explanation and distinction whereas some others did not. 4x write speed A Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks) (RAID) is a term for data storage schemes that divide and replicate data among multiple hard drives. You need at least four disks for raid 1+0, where you can build Raid 5 with three. Looks convincing enough. orgs. During that two-hour window, if the 2nd drive to fails happens to be in the same striped set, you still don’t lose the data. The ZDnet article is iffy at best. bad batches are not unique to SATA disks. WHAT WILL WE DO IF WE ARE USING HOTSPARE FOR BOTH RAID 50 AND RAID 10 THEN SIMULTANEOUSLY DRIVE FAILS FROM BOTH RAID LEVEL THEN THAT MOMENT HOW THE HOT SPARE WILL WORK.??? RAID 10 is certainly worth it depending on the context and performance of your data. The one differecne between the cloud embracers and the social media site users is that the CLud embracers will have paid more money. The standard implementation of RAID 5 may not suit every need but the general approach of using parity vice duplication is in principle sound. Hi ccj. Data protection includes up to one disk failure in each sub-array. many small writes incur a severe penalty. You’ll notice that media streaming or database logs (highly sequential) is where RAID 5 and RAID 6 shine, being outperformed only by RAID 0 on those tests. good backups). What sets this array apart is that it includes two independent sets of separately striped parity data. I personally felt RAID 5 was better but it has to maintain parity which makes its diffcult to maintain. RAID 6 seems like the best compromise to me, and I hope that modern hardware controllers with large cache will mitigate the performance issues. Luckily, I was able to tear the system apart and reinstall as RAID 10. The downside with RAID 0 arrays is that they do not maintain redundant data which means they offer no data protection for you. otherwise stick with raid 1. if you’re going to spend the money for 3 drives, build a raid 1 with a hot spare. RAID 10 is best suitable for environments where both high performance … ZFS is available on Solaris, opensolaris, Nexenta, and FreeBSD operating systems. Are using those products as the mirrored sets of a software stripped RAID set a good idea? As for safety, RAID 10 definitely has the edge. It’s now in a RAID 6 config to safeguard against one failure, but after this reading (and other material) I think the RAID 1+0 might have been a better scenario (although reduced storage implications). NO RAID5! Even though the server responded OK, it is possible the submission was not processed. For example: If a drive costs $1000US (and most are far less expensive than that) then switching from a 4 pair RAID10 array to a 5 drive RAID5 array will save 3 drives or $3000US. You can’t have a general answer for all scenarios. So 5 disks making 2 logical volumes. It all depends on the value of the data. A raid 1 of two 2TB drives can give you a 2TB longer term storage with 2x redundancy for data protection. Most people as soon as striping and mirroring gets mentioned, you can see their eyes glaze over. There is also RAID 50 to consider. Raid 10 arrays consist of two or more equally sized RAID 1 arrays. Parity calculations is what kills RAID 5 and RAID 6 for write performance, and unless your workload is a) read-only and/or b) highly sequential RAID 10 will outperform RAID 5 or RAID 6…particularly in a random read-write scenario RAID 10 easily outperforms RAID 5 and RAID 6. RAID 6 is harder to define. RAID6 with 6 drives For RAID 5 you need three minimum hard drive disks. We always recommend utilizing RAID in conjunction with an offsite backup package for the best redundancy in your dedicated server. In an ideal world you would have two or more realtime copies of your data in different parts of the world. Please contact the developer of this form processor to improve this message. However, Management seems to love no capital cost solutions! A parity calculation doesn’t require many operations and just shouldn’t take very long, compared with hard drive write time. You can deploy both implementations separately on the same server and jointly. One disk died and while the hot spare was rebuilding (which as you can imagine took ages) we had another die also. NO RAID5! A RAID 6 array can recover from two simultaneous disk failures. I truly can’t believe that there are so many IT professionals out there that negate the merits of RAID with a parity involved. Proof is: I’ve lost 2 Raid 5 arrays due to controller failures. Does a mirrored stripe offer better performance than a striped mirror?? Yes, RAID 1+0 is great for small data requirements, but if you use enterprise class SAS disks, the cost of implementing and maintaining large amounts of data storage far outweighs the risk associated with RAID 5 or 6 in nearly all situations. Clear, RAID 10 is storing 6Mb clear, RAID 5 got two WD Red 4TB mirrored! 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