[CentOS] Re: settings up cheap a NAS / SAN server, is it possible?

Scott Silva ssilva at sgvwater.com
Wed Jul 2 22:27:18 UTC 2008


on 7-2-2008 3:14 PM Victor Padro spake the following:
> 
> "It is human nature to think wisely and act in an absurd fashion."
> 
> "Todo el desorden del mundo proviene de las profesiones mal o 
> mediocremente servidas"
> 
> On Wed, Jul 2, 2008 at 11:08 AM, Scott Silva 
> <ssilva at sgvwater.com 
> <mailto:ssilva at sgvwater.com>> wrote:
> 
>     on 7-2-2008 8:52 AM Victor Padro spake the following:
> 
> 
> 
>         On Wed, Jul 2, 2008 at 8:50 AM, Rudi Ahlers
>         <Rudi at softdux.com
>         <mailto:Rudi at softdux.com>
>         <mailto:Rudi at softdux.com
>         <mailto:Rudi at softdux.com>>> wrote:
> 
>            nate wrote:
> 
>                Rudi Ahlers wrote:
> 
>                
>                    I think my action plan now will be to figure out how to
>                    install CentOS
>                    on a USB memory stick and make it boot on any machine
>                    (making it easy to
>                    replace if need be), and then to play around with the
>         RAID a
>                    bit and see
>                    how well it works.
>                      
> 
>                Another option you may want to consider is a PATA->CF
>         adapter. I use
>                these for my OpenBSD firewalls and have them installed on
>         1GB CF
>                cards.
>                Performance should be better? Compatibility certainly is
>         better,
>                there's
>                no way I could boot to USB off these aging P3-800
>         systems. The
>                CF cards
>                just show up as regular HDs
> 
>                I use these ($7):
>              
>          http://www.geeks.com/details.asp?invtid=SY-ADIDE2CF-B1&cpc=SCH
>         <http://www.geeks.com/details.asp?invtid=SY-ADIDE2CF-B1&cpc=SCH>
>              
>          <http://www.geeks.com/details.asp?invtid=SY-ADIDE2CF-B1&cpc=SCH
>         <http://www.geeks.com/details.asp?invtid=SY-ADIDE2CF-B1&cpc=SCH>>
> 
>                Paired with Lexar CF cards. Not all CF is created equal, well
>                maybe it is
>                today. I found my Lexar CF cards were 5-10x faster than my
>                Kingston cards
>                of the same size, which surprised me. Not that I need high
>                performance in
>                firewalls that do no disk I/O but it was painful for the OS
>                install to
>                take hours(Kingston) instead of minutes(Lexar). Both
>         pairs of CF
>                cards
>                are a few years old, today maybe everything out there is
>         reasonably
>                fast.
> 
>                At least with the above adapters be aware that those
>         adapters above
>                do stick up. I think a 2U chassis can fit them(I have tons of
>                experience
>                in supermicro systems). But no guarantees. You may need
>         another
>                adapter
>                or perhaps a male to female IDE cable so that you can
>         mount it
>                another
>                way in the chassis.
> 
>                I suppose you could even get two and run RAID.
> 
>                Just don't put your swap on the flash if you can avoid it.
> 
>                nate
> 
> 
>                ______________________________________________
> 
>            Thanx, nate
> 
>            That's a good suggestion, but I think the USB memory sticks could
>            work better / more reliable, and will be easier to access in the
>            cabinet. I'll play around with it a bit and see how it works.
> 
> 
>            --
>            Kind Regards
>            Rudi Ahlers
>            CEO, SoftDux
> 
>            Web:   http://www.SoftDux.com
>            Check out my technical blog, http://blog.softdux.com for Linux or
>            other technical stuff, or visit
>         http://www.WebHostingTalk.co.za for
>            Web Hosting stuff
> 
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>         <mailto:CentOS at centos.org>>
> 
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> 
> 
> 
>         Hi,
> 
>         (I apologize in advance if someone thinks this is OT)
> 
>         I've been reading this thread since it started, and what I could
>         really say is you should go for freenas, it can be installed in
>         a matter of minutes in a usb pendrive, I use it on a 2gb
>         kingston one using an IBM eServer tower chassis, Intel D201GLY2
>         mainboard, 1Gb 667Mhz RAM, 2 HDs those are 750gb SATA in RAID5
> 
> 
>     2 drives in raid5? Then it is really only a raid 0, and will fail
>     sooner or later.
> 
> 
> Even if it's fake RAID5(RAID software)?
> Didn't know that.
Raid 5 need a minimum of 3 drives. The only way to get 2 drives in software 
raid is to create the array with the "missing" statement.
With only 2 drives, you have a stripe with a failed parity.

So 2 drives is already missing one, and the next failure is doom.
Raid 1 (mirror) is fine with 2 drives.

-- 
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

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