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Questions tagged [raid-10]

RAID (Redundant Array of Individual Disks) 10 is useful for both speed and redundancy

RAID 10 (or RAID 1+0) is a hybrid array type that offers speed by splitting the data between drives, and redundancy by placing it on multiple drives. The minimum number of drives to use is 4, and the storage space is 1/2 the total space of the drives set aside for this array.

Questions with this tag should include the controller type (for troubleshooting) or at least whether it's a Software RAID.

The data is laid out as such across the 4 drives:

Drive A | Drive B | Drive C | Drive D
Part A1 | Part A2 | Part A1 | Part A2
Part A3 | Part A3 | Part A4 | Part A4

Because data is duplicated on drives, you can have UP TO 2 drives fail in the array before data loss occurs. With RAID 1, you can only have one drive fail (especially since you would lose all data if your only copies disappeared). With RAID 0, you get great speed, but if you lose one drive, you lose the entire array. RAID 10 solves these problems

43 questions
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7 answers

Adding drives to a RAID 10 Array

How would I grow a RAID10 array using mdadm? Obviously I would need to add 2 drives at a time, or would it have to be 4 drives? I have a feeling its just a bad idea. Or would be just wiser to just opt for RAID5?
stuartc
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6 answers

How to find which drives are mirrored within a RAID-10 array?

I have a home media server running on openSUSE 12.2. I'm using eight 2TB drives in a RAID-10 configuration. I deliberately bought two different types of drives: four Seagate Barracuda Green and four Western Digital Red. My goal is to configure the…
CapnBFG
6
votes
1 answer

How many drives can I safely lose in a RAID-10 array?

In a 4-drive RAID-10 setup, how many drives can I "safely" lose before the data becomes unrecoverable? It's a bit unclear to me whether the setup provides one drive or two drives worth of redundancy. Is the redundancy of RAID-01 different or the…
IQAndreas
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2 answers

Fault tolerant RAID6 / RAID10 design for home server - not performance critical

I want to balance disk space against fault tolerance. I would like fault tolerance to be able to handle multiple disk failures (as I may not be able to afford replacements disks or have the time for weeks possibly) The main purpose of the home Linux…
Adrian Cornish
  • 163
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2 answers

Minimum number of hard drives needed for RAID 10?

I would like to build a home file server running Windows Server 2012, with WD Red hard drives configured in RAID 10. What is the least number of these hard drives I need to purchase to be able to configure in RAID 10? I've researched and some sites…
user76275
3
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3 answers

RAID 0 + 1 with 3HDD 2x1TB + 1x2TB

Is it possible to make RAID 0 + 1 with 3 Hard Drives I have currently setup raid 0 with 2x~1TB HDD (1.8TB approx) Now i got 2TB HDD (1.9TB approx) which i want to be as a mirror drive. Is is possible to do a hardware raid 0+1 with 3 HDD 2x1TB Same…
George
  • 977
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Metadata of the assambled raid inconsistent with the metadata of the individual drives?

We have a raid 10 with two failed drives, with one drive from each set still functional. When booting into rescue system the metadata seems to be fine and consistent with the expected state. The metadata from mdadm --detail of the md is as follows: …
user910763
  • 31
2
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3 answers

How is Data Recovered when a RAID array fails

I am thinking of using hardware RAID (levels 5 and 10) on my computers. What I don't get is how is data recovered when something goes bad and the RAID array fails (RAID Card problem or anything else). When using standalone disks the process is very…
udi
  • 31
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1 answer

Alternative to RAID 10

With 6 drives in RAID 10 one will get 3 drives effective storage and 3 redundant drives, so in a best case scenario up to 3 drives can fail without loosing any data. But in a worst case scenario (now correct me if I'm wrong) even two failed disks…
lindhe
  • 245
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1 answer

Linux raid10 on btrfs

I've read that BTRFS requires at least 4 disks (https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices). Indeed, Linux mdadm raid10 requires only 2 disks (http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10). Is…
Alberto
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3 answers

RAID on Solid State Drives

Are there any notable differences, other than (awesome) performance, when running RAID arrays made up of solid state drives? I'm considering one of the two: 4 x 256GB SSD in RAID-10 (total usable array size = 512GB). 6 x 256GB SSD in RAID-50…
Naftuli Kay
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2
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2 answers

How to recover RAID 10 from Mobius 5 Bay RAID array?

I have a Mobius 5 Bay RAID array, with 10TB in each drive. I have it set to RAID 10. Recently I switched off and on my house's power breaker with this device on it, and now when it starts it fails with beeping and a purple error light on drive 2…
xdhmoore
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Up to which point (disk size) is Raid 6 safe to use?

I have been reading a lot of warnings about Raid-6 becoming less and less safe to use due to the storage amount per disk as well as array sizes increasing. What are the best practice limits/when does it make sense to take the economical hit of using…
user2693017
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2 answers

ZFS RAID 10 pool with mixed disks size

I have 4 disks: 2x2TB and 2x1TB. All of the same RPM 7200 and manufacturer. OS is Ubuntu 16.04. I want to make a RAID 10 pool, but I've heard that mixing disks size is not a good approach to ZFS - correct me if I'm wrong... So which is better of…
Artico
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1 answer

How to increase storage space in a RAID 10?

So Lets say that I have a server running on 4 hard drives... We have them in a RAID 10 setup and they are all 600GB. Now I take one of them out, then swap it physically with a 1.2TB HDD. In this circumstance, obviously the larger drive will be…
user865814
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