[nylug-talk] How to set up Raid 1 on Ubuntu, Or Linux in gerneral

[Carlos Alfaro]

I had to go read the archives because it seems I am not getting all the messages.

I am not an expert, so I wont suggest differently from thee suggestions of hardware raid SCSI or software raid

I do agree that if the card fails you need the exact replacement
that is why I asked how important is the setup...

Always, always, mission critical stuff, if you are the admin - you should have spare hardware.
That is why I was suggestion the lower end (cost wise) hard ware which is not hard to purchase 2 of
i.e. the netcell based stuff (but not the first priority since co went belly up)
but the 3ware cards are true hardware as well as some of the adaptec cards.

I agree if you spend money on scsi raid, you provably wont have to buy two of them (if its really good quality)
I have some scsi cards with HDD which are pusing 10 years old, and still working -- from adaptec, good hardware.

if its not too critical, stick with SATA drives and either software raid - if you know how to set it up
or get a pair of less expensive hardware cards - I personally use the netcell cards and 3ware cards

I know they are fast enough for just storing old pst files and iso images and the files my users like to store where they wont interfere with the main application server (i.e they put pictures, mp3 - and yes I do allow them as long as they are in the storage server, bandwidth limited and they are scanned with anti-virus before they go there)

Again, lots of factors involved - is cost an issue? space? size of data? time frame?  

if management is your issue, get a card that you can manage with a browser and not just a gui/utility (3ware for example)

and no, I do not work for any of the companies whose products I have mentioned.

Later all

can anyone tell me why i dont get all the messages in a specific thread?  I saw a message answered, and I did not see it in my folder, the original message that is, so I went to read archives and it was there...

Thanks in advanced to anyone...


----- Original Message ----
From: Chris Knadle <Chris.Knadle at coredump.us>
To: NYLUG Technical Discussion <nylug-talk at nylug.org>
Sent: Friday, June 1, 2007 10:22:10 AM
Subject: Re: [nylug-talk] How to set up Raid 1 on Ubuntu, Or Linux in gerneral

On Friday 01 June 2007, Henning Follmann wrote:
<snip>
> And that's why you should either buy a decent controller (that is
> scsi) or stick with software raid.
> I know the scsi option defeats the "i" in raid but in the long run it
> pays off to spend more on some hardware.

   I like SCSI hardware, but it is much more costly, and SCSI drives tend to 
be smaller in storage size.  36 GB to 74 GB SCSI disks are relatively 
affordable at under $200, but from there it gets expensive fast.  For storage 
servers where what is being sought are larger drives, that cost becomes 
prohibitive:
   300 GB SATA disk:  $80
   300 GB SCSI disk: $600

   Not quite an order of magnitude in price difference, but pretty close -- 
and that's without considering the SCSI controller or terminators.

   For $600 I could buy a /pair/ of 750 GB SATA drives and mirror them.
So as much as I like SCSI hardware, I know what I'd buy if I was setting up a 
new file server.  :-/

> As a side effect you also get the longer MTBF of SCSI hard disks.

   Unfortunately the data that I've seen shows that the listed MTBF ratings 
are optimistic [not that that's any surprise], and that SCSI disks may not be 
much more reliable than SATA disks.

      http://www.usenix.org/events/fast07/tech/schroeder.html


   -- Chris

-- 

Chris Knadle
Chris.Knadle at coredump.us
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