Doh, actually send it to the piclist this time :)

---
Ashley Roll
Digital Nemesis Pty Ltd
www.digitalnemesis.com
Mobile: +61 (0)417 705 718




> -----Original Message-----
> From: Ashley Roll [mailto:ash@digitalnemesis.com]
> Sent: Wednesday, 27 February 2002 11:04 AM
> To: 'dcchan@magix.com.sg'
> Subject: RE: [OT]: Hard Drive Crash Recovery. Crowbars
>
>
> Hi Derek,
>
> RAID is good. RAID is REALLY good. Never buy a server with out it!
>
> There are several different levels of RAID.. Starting with
> just making several disks look like one, and going up to full
> redundancy and error correction. You can get controllers and
> servers that support "hot swapping" disks.
>
> This is cool, If a disk fails, you pull it out and put in a
> new one while the computer is running. the RAID controller
> rebuilds that disk from the data stored on the others and
> apart from a bit of a speed loss during this rebuild, the
> machine and all the applications are running happily.
>
> Originally you could only get this on SCSI disks, but now
> there are some IDE versions.
>
> The problems is that a GOOD raid controller is so much better
> then a cheap and nasty one as it will allow you to recover
> without stopping the machine. I've never used one of the IDE
> ones so I can't say how good they are, but I've used high end
> ones on Compaq and Dell servers.. Very cool.
>
> Big systems can be gotten from Compaq where the disk array
> actually takes a full 19" rack for itself (Terra-Bytes of
> data). Then there are computers that have multiple parallel
> processing CPUs (all hot swappable) in other racks. Then if
> you want to get really serious, you can have more then one
> complete multiprocessing computer talking to the same disk
> array so that if one computer fails the other can take over.
> This is not cheap! All of this running Win2K or XP "data
> centre". Big computers. I have some friends that look after
> these types of computers in large corporations.
>
> Cheers,
> Ash
>
> ---
> Ashley Roll
> Digital Nemesis Pty Ltd
> www.digitalnemesis.com
> Mobile: +61 (0)417 705 718
>
>
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Derek Chan
> > Sent: Wednesday, 27 February 2002 10:38 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [OT]: Hard Drive Crash Recovery. Crowbars
> >
> >
> > With all these worries about hard-disk crashing, has anybody
> > consider or
> > even purchase RAID controllers as an insurance. See link
> > http://www.promise.com
> >
> > I have no idea about this product...been reading something about
> > RAID...which stands for "Redundant Array of
> > Indepedent(Inexpensive) Disks"
> >
> > If what they are selling is what I think it is, then you
> > insert this card
> > into your PC with a number of hard disks, example 4
> hard-disk. If one
> > hard-disk crashes, then information from the other 3
> > hard-disk can be used
> > to regenerate the lost data.
> >
> > It is also suppose to make the 4 disk look like one large
> > disk (maybe like
> > total of 3 disks capacity)
> >
> > It is also suppose to be faster, as data are stored across
> > multiple disk,
> > and retrival is faster because 3 disks are spinning to get data
> > simultaneously..
> >
> > I thought such things are availiable only for HIGH END
> > COMPUTERS, and I am
> > surprise it is avaliable for PC. Anybody tried this product
> > before ? and Did
> > I understand what RAID is correctly ?
> >
> > Derek
> >
> > --
> > http://www.piclist.com hint: PICList Posts must start with
> ONE topic:
> > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other
> [BUY]:,[AD]: ->Ads
> >
> >
> >
>

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