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Home > Archive > Unix Programming > April 2004 > Striping data across mutiple disks
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Striping data across mutiple disks
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| aruna 2004-04-28, 12:34 pm |
| Suppose I have 2 physical disks and a single file is
distributed over these 2 disks, where is the information
stored in the operating system which allows the retrievel of
information or the storage of information in the OS?
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| David Schwartz 2004-04-28, 12:35 pm |
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"aruna" <arunal2001@yahoo.co.in> wrote in message
news:a2efcaed.0404280748.5c60f49d@posting.google.com...
> Suppose I have 2 physical disks and a single file is
> distributed over these 2 disks, where is the information
> stored in the operating system which allows the retrievel of
> information or the storage of information in the OS?
It depends upon the OS and what technology is being used to distribute
data over the 2 disks. Generally each disk that's being used in this way has
a header on it somewhere that specifies that this disk is part of a
muti-disk set, how many disks are in the set, which disk it is in that set,
perhaps the identifiers of the other disks (or at least some unique
identifier for that set), and what technology is used to form the set
(extended file system, RAID 0, etectera).
DS
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| Fletcher Glenn 2004-04-30, 1:35 pm |
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David Schwartz wrote:
> "aruna" <arunal2001@yahoo.co.in> wrote in message
> news:a2efcaed.0404280748.5c60f49d@posting.google.com...
>
>
>
> It depends upon the OS and what technology is being used to distribute
> data over the 2 disks. Generally each disk that's being used in this way has
> a header on it somewhere that specifies that this disk is part of a
> muti-disk set, how many disks are in the set, which disk it is in that set,
> perhaps the identifiers of the other disks (or at least some unique
> identifier for that set), and what technology is used to form the set
> (extended file system, RAID 0, etectera).
>
> DS
>
>
In many of the RAID implementations, the OS treats the RAID as a single
logical disk, and the RAID unit itself keeps track of where the data
is actually stored. If you have a software RAID, then (translation
of) the data location would best be implemented in the RAID driver
software.
--
Fletcher Glenn
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