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Raid configurations



  Rav4
What do you guys like to implement as a safe, robust solution.

I always liked Raid 5 however, reading more on it, it seems there are alternative solutions.

Thoughts please.

HP servers.

£600 budget (sucks I know)

Discs will be running exchange, special apps and docs.
 
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  Better than yours. C*nt.
How much money, what do you want, what are you using it for and what kit will you be using?
 
So the main use will be Exchange?

There are loads of articles on the internet for design considerations.. etc..

How many users/mailboxes etc?

£600 might be pushing it if you do intend to really load the server up.
 

dk

  911 GTS Cab
no chance with £600.

you don't get any decent raid configurations unless you go for a proper RAID controller.

For £600 you are looking at SATA and RAID 1.

Optimum config for exchange would be a DL380 with a decent amount of ram (especially if its 2007) and then 2 drives mirrored for the OS, 2 drives mirrored for logs and then 4 drives in RAID 1+0 for the data, all SAS 15k.

No chance with £600 though i'm afraid, with that budget you are looking at one of the new DL160's or DL180's with a couple of SATA hdd's and no redundancy (i.e. power) or a DL140.
 
  Rav4
nothing large.

30 mailboxes.

Server is there.

All installed.

Currently have a raid 5 implemented.

Raid controller obviously there.

:)
 

dk

  911 GTS Cab
i'm confused then, what are you asking for, the best raid?

not sure where the £600 came into it.

what server is it, what raid controller and how many disks?

like i said above, the optimum config is separate os, logs and data.

raid5 isn't the best raid, it the cheapest which is why alot of people use it.

for performance lots of spindles in raid 1+0 and for resiliance raid 6 adg are the two main options.
 

KDF

  Audi TT Stronic
It worth mentioning that RAID 10 give the worst return of disk space though. 50% where as RAID5 will return the most disk space but does not perform as well.

If your only running 30 mailboxes and want performance I would say go RAID 10
 
at the end of the day it all depends what your after speed or reliability

5 is a good all-rounder for reliability

raid 6 even more resilient

raid 0 fast but a no no in servers

raid one fast and some resilience

nested raid can offer some great combinations of speed and reliability by combining the raid levels
 

dk

  911 GTS Cab
raid 5 and 10 offer the same resiliance, although it could be argued that in some situations raid 10 is more resiliant as it can handle multiple drive failures as long as they are in the same mirror set.

As mentioned though it is the most expensive as more discs are needed.

RAID 6 gives the best resiliance although the speed can suffer.

Most of my customers are moving away from RAID 5 in favour of RAID 10.
 
  Better than yours. C*nt.
Exchange recommendations are two array controllers, one running a mirror for the OS and a seperate RAID5 for the mailboxes.

However, with 30 mailboxes I'd say that as long as you had decent throughput you could have one big array and partition that...

HP EVA vRAID FTW...
 

dk

  911 GTS Cab
Exchange recommendations are two array controllers, one running a mirror for the OS and a seperate RAID5 for the mailboxes.

However, with 30 mailboxes I'd say that as long as you had decent throughput you could have one big array and partition that...

HP EVA vRAID FTW...
LOL, EVA is a bit different!

it all depends on how many disk drives you have i guess as the more the better at the end of the day, but yes, i'll give you that eva for the win.
 
  Better than yours. C*nt.
Exchange recommendations are two array controllers, one running a mirror for the OS and a seperate RAID5 for the mailboxes.

However, with 30 mailboxes I'd say that as long as you had decent throughput you could have one big array and partition that...

HP EVA vRAID FTW...
LOL, EVA is a bit different!

it all depends on how many disk drives you have i guess as the more the better at the end of the day, but yes, i'll give you that eva for the win.

4x disk shelves with redundant controllers... 4x10k 300Gb disks in each at the moment with plans to expand another 4 in each in the next couple of months for another service we've got, with a backup server (DL140) and a 3U 16 Terabyte array underneath it...
 


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