please explain What is Raid level 00 and its benefits ?

please explain What is Raid level 00  and its benefits ?.
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harisaboobakerAsked:
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Alexandre TakacsCTOCommented:
I muss confess that I have never come across that terminology. Can you be more specific where you got this "RAID 00" ?
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nociSoftware EngineerCommented:
Raid level 0 is spreading IO over as my different disks (and if needed controllers) as possible WITHOUT any redundancy.
- Pro :   Disk bandwidth
- Con: if one disk dies the whole array dies, because of the gaps in the data (that are unrecoverable if the lost disk becomes unrecoverable).

Raid 4, 5, 6 are  the same, except there in on dedicated parity disk in Raid 4, a distributed parity aria's in Raid 5 and 2 distributed paritity area's in Raid 6.

With the redundancy information also comes the burden of doing multiple IO's to the parity area's.    (read & 2 times XOR & write) and reading old data on behalf of the parity info.
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Alexandre TakacsCTOCommented:
Sorry but how does a RAID 0 differ from a RAID 00?
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nociSoftware EngineerCommented:
Not that i know of..... inflation of numbers?

like there was raid 0, raid 1... and combination to have better failure modes, like raid 01/ raid 10
The first being a mirror of a pair of stripesets and the latter a stripe of mirror sets. (which has slightly better recovery times).
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Seth SimmonsSr. Systems AdministratorCommented:
What is Raid level 00  and its benefits ?.

it stripes data across multiple disks giving better performance
higher risk of failure because of no redundancy so if you use it, make sure you have good backups

since raid 0 is not redundant, in my opinion, is an oxymoron
don't use in production
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Scott CSenior EngineerCommented:
A RAID 00 drive group is a spanned drive group that creates a striped set from a series of RAID 0 drive groups.

See here...  https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/raid/configuration/guide/RAID_GUIDE/IntroToRAID.html

Same as what Andy posted above with a link with lots of reading.
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Alexandre TakacsCTOCommented:
Hmm so in essence it is the stacking of raid0 RAID? Ok...

I guess it might be useful in some fairly exotic cases.
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nociSoftware EngineerCommented:
Raid 0 (however one names & configures it) is only useful to stream extremely fast data streams.  Where dataloss due to volume is a greater risk then loss of data through corruption... (Think of CERN during experiment runtime, massive parallel super computers).
If Push comes to shove, the experiment needs to be rerun if a disk goes broken.
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andyalderSaggar maker's framemakerCommented:
Not really any such thing, Cisco are too new to storage to be defining new nested RAID levels. They haven't even used the term "spanned" correctly, span is a concatenation where one disk is filled up completely and then new data is put on the next disk in both LVM(Linux) and Dynamic Disks (Windows).
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harisaboobakerAuthor Commented:
Thank for all for your valuable comments ...
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andyalderSaggar maker's framemakerCommented:
Hmm, my bad. It's actually Broadcom who came out with the term RAID 00 and they (or at least LSI who they bought) have been in the business a long time.
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nociSoftware EngineerCommented:
"spanned" disks are also known to OpenVMS as "Bound Volume Sets"  IBM will also have a name for it.
With bound volumesets a file also is completly on ONE disk, so corruption of a disk doesn't mean  loosing all data.
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harisaboobakerAuthor Commented:
Thank for all for your valuable comments ...
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