Yet another RAID Question (YARQ)
sandy at krvarr.bc.ca
Wed Jun 22 01:16:08 GMT 2005
>>>>> On Mon, 20 Jun 2005 11:36:32 +0100,
>>>>> Alex Zbyslaw <xfb52 at dial.pipex.com> said:
> Ted Mittelstaedt wrote:
>>> Sent: Sunday, June 19, 2005 10:52 PM
>>> In order to boost read performance, a RAID card should interleave
>>> reading from a RAID-1 volume by reading alternately from one drive and
>>> then the other. You can see this in alternate blinking of the
>>> activity lights of the drives. If you are not seeing this when
>>> copying a large file, then this would suggest that a RAID-1 volume is
>>> not working as it should.
>> Incorrect. What you are describing is RAID-0. RAID-1 is mirroring.
> I don't think you read the message correctly. It said that *reads* were
> interleaved not that the *data* was interleaved.
That's exactly what I said. Thanks.
Ted, I am aware that RAID 1 is mirroring. However, any proper
implementation of RAID 1 should also boost read performance and if
during a read you are not seeing activity on both drives in the RAID 1
volume, then I would say this is a good indication that something is
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