Re: No Mirror or Raid

OK - the relevant question to ask is, if you lost the system and 
everything on it, how much would that impact you?     You'll want 
redundant complete saves of the system in case you loose a disk and there 
is a media error on the first save set you try. 

It is fairly likely unless this is a system with very few disks that at 
least one disk will fail in the next few years.  If that happened without 
any sort of protection, the system would probably crash, and probably need 
to be reloaded.  If your last tapes are bad (and tapes have greater 
failure rates than disk), you'd have to go back to find a good one.  That 
could mean loosing days worth of work (assuming nightly backup).

In the best case, the system would be down for a day or more as you 
restored it.  In the worst case, you might have to attempt restoring a few 
times, have to reload from the CD's, reapply the last cume and loose a day 
or two of work because the more recent tapes are bad. 

Basically, is the cost of a day of downtime in the next couple of years 
more or less than the cost of adding RAID to your system?   How much 
worker's time would be wasted if you are down for a day? 


Jeff Carey
Technical Specialist
AS/400 Technology
Transaction Processing Systems
DF5-1W 
847-948-2191




"oludare" <oludare@ix.netcom.com>
Sent by: owner-midrange-l@midrange.com
03/07/01 01:16 PM
Please respond to MIDRANGE-L

 
        To:     <MIDRANGE-L@midrange.com>
        cc: 
        Subject:        Re: No Mirror or Raid


Guys,

Just to put this topic in perspective, this box is only for DEVELOPMENT in
an educational environment (Non-for profit).

Dare

----- Original Message -----
From: "MCPARTLAND, Stan" <stanley.mcpartland@bently.com>
To: <MIDRANGE-L@midrange.com>
Sent: Wednesday, March 07, 2001 1:56 PM
Subject: RE: No Mirror or Raid


> When you consider the cost of 1) identifying and reprocessing lost
> transactions and 2) the downtime cost (productivity, customer service,
etc.)
> this quickly becomes a CON.
>
> Regards,
> Stan
>
> <snip>
>
>   Pro: you save a few dollars because you don't need a RAID controller
>
> <snip>
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