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| From: | [log in to unmask][log in to unmask], 10 Nov 1996 11:22:43 -0800204_- Netbase as mentioned below is a good idea. Especially in December when their database shadowing product will let you enter transactions on "both sides of the shadow". <snip>41_10Nov199611:22: [log in to unmask] |
| Reply To: | |
| Date: | Mon, 11 Nov 1996 13:16:29 -0500 |
| Content-Type: | text/plain |
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In a message dated 96-11-09 10:59:49 EST, [log in to unmask]
writes:
<<
Does anyone on the list know where I can find a detailed definition
of Raid levels (0,1,0/1,3 & 5). I have a bullet list but no detail.
>>
RAID 0 is disk striping, data is striped across the disks. Higher throughput.
You cannot recover a lost disk. Requires 2 or more disks.
RAID 1 is disk mirroring. It requires double the amount of disc space.
Somewhat higher throughput. You can recover a lost disk. Requireseven number
of disks.
RAID 4 is disk striping with one disk dedicated to parity. Higher troughput.
You can recover a lost disk, either the parity disk or any of the others.
Requires 3 or more disks.
RAID 5 is disk striping with parity. The parity is distributed across the
drives. Highest troughput. You can recover from a lost disk. Requires 3 or
more disks.
Can't remember what 2 and 3 are, but I expect they are variations on the
theme.
Kind regards,
Denys. . .
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