RAID 10 = 1+0

Richand · 21 Aug 2008 at 10:24

Hi Guys,

I'm a bit confussed and wondered if you guys could help, a new 3rd line engineer at work has been giving me a hand with a citrix server and while sorting the raids I said to him we sould setup the drives in a raid 10 he then turns around to me and says "no we should setup a raid 1+0 as its better" infront of my boss and laughs....I then was like there the SAME thing he then walks off laughing his head off....I feel a little belittled by this and have always thought of raid 10 to be the same as raid 1+0, google isnt much help to be honest.

am i right?

Delvis · 21 Aug 2008 at 10:30

hm...You can't really get RAID 1+0...You can do a RAID 0+1, which is Striped drives mirrored to another set of drives.

Here: 0+1 - http://bytepile.com/raid_class.php#03

Raid 10: http://bytepile.com/raid_class.php#10

oddjob62 · 21 Aug 2008 at 11:44

Smack him in the face... he's being a ****

EsaT · 21 Aug 2008 at 11:51

There are two ways for combining mirroring and striping.
But RAID 10 and RAID 1+0 mean same, like RAID 01 or 0+1. Important thing is order of number.

http://en.wikipedia.org/wiki/Nested_RAID_levels
http://www.storagereview.com/guide2000/ref/hdd/perf/raid/levels/multLevel01.html

oddjob62 said:
Smack him in the face... he's being a ****

I would prefer cramming one array to his rear.

stoofa · 21 Aug 2008 at 12:02

The basic difference:

One is a striped mirror
The other is a mirrored stripe

Sound the same - but there are subtle differences.
Both give you a performance increase because of the striping.
They both offer you redundancy because of the mirror.

The difference is in the number of disks that can fail before the array goes off-line.
RAID 0+1 actually offers more combinations (Can lose any one drive and most combinations of 2 drives and the data will be retained and the disks will stay online, all be it no longer in a RAID mode).
With RAID 10 you can lose any one drive but only one combination of two drives can be lost before the array goes offline.

silversurfer · 21 Aug 2008 at 12:05

Both are a raid combo so yea same thing, even my cheap pci card does these two I think

mirror of a stripe and stripe of a mirror :confused:

They emphasis the + on the 01 because it shouldnt be confused with just 1

http://www.span.com/catalog/technical_raid.php?language=en&osCsid=c34de19985a8e767b4c2de95b60415df

JBod · 21 Aug 2008 at 13:36

Quick answer, yes Raid 10 is Raid 1+0. It is the fastest form of raid (assuming a good controller).

ruffneck · 21 Aug 2008 at 14:29

lol he's being a fool

its like saying 'Lets meet at quarter to eight tonight' then someone replying 'No better make that seven forty-five'

okay bad analogy but come on!

Dist · 21 Aug 2008 at 15:25

If he thinks they are different, get him to try and explain the differences between 10 and 1+0, then you can laugh at whatever he trys to answer with.

Curiosityx · 21 Aug 2008 at 20:05

* 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 mirror set, but if drives fail on both sides of the mirror the data on the RAID system is lost.

* RAID 1+0: mirrored sets in a striped set (minimum four disks; even number of disks) provides fault tolerance and improved performance but increases complexity. The key difference from RAID 0+1 is that RAID 1+0 creates a striped set from a series of mirrored drives. In a failed disk situation RAID 1+0 performs better because all the remaining disks continue to be used. The array can sustain multiple drive losses so long as no mirror loses both its drives.

Even though both do a similar job i have often found 1+0 to be the better of the two interms of performance.

Adrianr · 21 Aug 2008 at 22:24

Before you go shouting the odds, you are dead sure he wasn't being sarcastic?

Richand · 22 Aug 2008 at 21:22

nah he was being serious, I sent him the wiki links with a "ner ner" on the end and he came and said "sorry, I didnt realise they where the same" told him to study for server+ or something

Major_Disaster · 9 Sep 2008 at 21:36

What an idiot.

RAID 10 = RAID 1+0

As others are saying, there is also RAID 0+1 (or i spose you could say RAID 01) - Not to be confused with RAID 0 or RAID 1.

RAID 1+0 and RAID 0+1 are nested RAID levels.