[CentOS] Infrastructure HELP!

Neil Aggarwal neil at JAMMConsulting.com
Thu Oct 29 19:11:14 UTC 2009


RAID 10 is striping across mirrored drives.

So, if you have 4 x 1TB drives, think of it as two separate
1 TB volumes.  The system will write half your data to
volume A and the other half to volume B.  The data in volume
A and B do not overlap.

Now, each volume is composed of a mirrored set of drives.  
Anything written to volume A is actually stored on two drives.  
Anything written to volume B is actually stores on the other two
drives.

Does this make sense?
Let me know if you need any more explanation.

Also, when you move to a hosted solution, I would appreciate
your considering my company for it.

	Neil

--
Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com
CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU
1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime 

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of ML
> Sent: Thursday, October 29, 2009 1:03 PM
> To: CentOS mailing list
> Subject: Re: [CentOS] Infrastructure HELP!
> 
> Neil,
> Can you explain how RAID 10 would work with 4 x 1tb drives?
> 
> Should I just get 2 x 2tb drives and mirror?
> 
> I probably dont need 4 x 1tb drives to start, maybe even 2 x 2tb. I  
> can't image this growing faster than I can get money to add more  
> equipment, move to Co-Lo, etc.
> 
> On Oct 29, 2009, at 10:59 AM, Neil Aggarwal wrote:
> 
> >
> > If you want speed, use RAID 10.
> >
> > 	Neil
> >
> > --
> > Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com
> > CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated  
> > 64bit CPU
> > 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero  
> > downtime
> >
> >> -----Original Message-----
> >> From: centos-bounces at centos.org
> >> [mailto:centos-bounces at centos.org] On Behalf Of ML
> >> Sent: Thursday, October 29, 2009 12:57 PM
> >> To: CentOS mailing list
> >> Subject: [CentOS] Infrastructure HELP!
> >>
> >> Hi Everyone,
> >>
> >> I started a social networking site and I am getting ready 
> to go live
> >> next week. I have limited fund as I am not funded yet (although
> >> hopefully soon).
> >>
> >> I have an extra Mac Pro (I know, how can I possibly call a Mac Pro
> >> dual 2.8 quad core with 16gb RAM extra). So Mac Pro quad Core, 16gb
> >> RAM, 4 x 1tb RAID level Seagate drives. I was going to load
> >> CentOS 5.4
> >> on it, web, mysql etc, etc. This is really the only box I have that
> >> would handle the site it it takes off and then I would need to add
> >> more hardware and most hosting to RackSpace or something.
> >>
> >> My question is about initial setup. The 4 x 1TB drives. How to set
> >> this up for I have some protection?
> >>
> >> RAID 0+1? (striped + mirrored) I would end up with 2TB 
> useable space.
> >>
> >> RAID 5? so what one is a hot spare? 3TB useable space?
> >>
> >> What about striping the 4 1TB and mirroring that to a 4 x 1tb
> >> External
> >> drive enclosure?
> >>
> >> I want to be sure the data is protected, but machine resources and
> >> money are limited.
> >>
> >> Thoughts are appreciated!
> >> _______________________________________________
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> >> CentOS at centos.org
> >> http://lists.centos.org/mailman/listinfo/centos
> >
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> 
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