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Can describe what is RAID 0 -- -- RAID 10
- Thread starter mingx98
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ElgisRamon
MIS
RAID 0 is not standard, but normally is hardware stripping, RAID 10 normally means RAID 1+0, and RAID 1 is hardware mirroring, then RAID 10 is hardware stripping + hardware mirroring, say, poor's man RAID 5.
I hope it works... [sig][/sig]
I hope it works... [sig][/sig]
Elgis,
With respect -- it's not quite true to say that RAID 1+0 is a poor mans RAID 5. They both have their uses.
RAID 1+0 (I'm just gonna them R5 & R10) is, as you say, striping and mirroring. Data is striped across disks for speed and then mirrored across other disks for resilience. Safe, Fast, Uses lots of disk space.
R5 is a parity based data-redundancy scheme -- and it's slower than R10. Safe, Slow(er than R10), Uses less disk space (than R10)
Best thing to do, therefore, is keep the data you use a lot (that you need fastest) in R10 and the data you use least (that you don't mind being a bit slow) in R5.
Let me give an example: (and this is *NOT* an advert for HP btw - other vendors have products which are just as wonderful)
The "Best thing to do" is quite a bit of work (Hmm...) so I use HP's AutoRAID product which suits me down to the ground because I'm a lazy so and so...
AutoRAID (AR) is a big box of disks which you configure to look like some SCSI devices (LUN's, I think they're called) and you put filesystems or whatever on those.
AR then stores everything it can as R10, if it has enough space that is. When it starts to run short it migrates some data to R5 --- nice thing (for lazy ppl like me) is that AR looks for the least recently used data to put into R5 -- so data you use a lot is stored in the fastest and most expensive way and data you use infrequently (something of a relative term here) is stored using R5.
Only time it has let me down was when local IT staff left the air con off........ which didn't do the whole thing any good at all....... [sig]<p>Mike<br><a href=mailto:michael.j.lacey@ntlworld.com>michael.j.lacey@ntlworld.com</a><br><a href= Cargill's Corporate Web Site</a><br>Making mistakes, so you don't have to. <grin>[/sig]
With respect -- it's not quite true to say that RAID 1+0 is a poor mans RAID 5. They both have their uses.
RAID 1+0 (I'm just gonna them R5 & R10) is, as you say, striping and mirroring. Data is striped across disks for speed and then mirrored across other disks for resilience. Safe, Fast, Uses lots of disk space.
R5 is a parity based data-redundancy scheme -- and it's slower than R10. Safe, Slow(er than R10), Uses less disk space (than R10)
Best thing to do, therefore, is keep the data you use a lot (that you need fastest) in R10 and the data you use least (that you don't mind being a bit slow) in R5.
Let me give an example: (and this is *NOT* an advert for HP btw - other vendors have products which are just as wonderful)
The "Best thing to do" is quite a bit of work (Hmm...) so I use HP's AutoRAID product which suits me down to the ground because I'm a lazy so and so...
AutoRAID (AR) is a big box of disks which you configure to look like some SCSI devices (LUN's, I think they're called) and you put filesystems or whatever on those.
AR then stores everything it can as R10, if it has enough space that is. When it starts to run short it migrates some data to R5 --- nice thing (for lazy ppl like me) is that AR looks for the least recently used data to put into R5 -- so data you use a lot is stored in the fastest and most expensive way and data you use infrequently (something of a relative term here) is stored using R5.
Only time it has let me down was when local IT staff left the air con off........ which didn't do the whole thing any good at all....... [sig]<p>Mike<br><a href=mailto:michael.j.lacey@ntlworld.com>michael.j.lacey@ntlworld.com</a><br><a href= Cargill's Corporate Web Site</a><br>Making mistakes, so you don't have to. <grin>[/sig]
ElgisRamon
MIS
I do know all RAID schemes inside, but I try to follow the golden rule: KISS [sig][/sig]
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