Manish Kathuria wrote:
On 3/29/07, tblader <tblader@xxxxxxxxxxxx> wrote:
One drawback is software raid wants a single ide device on each ide
channel.
This means buying an ide card (if you want more than two devices)
which doesn't
always play well with the rest of the system (4+ ide devices). Some
mainboards
might have more than two ide channels, but I just opted for the cheap
ide card.
Can you please confirm the same or refer to some documentation
indicating that ? I have recently added two HDDs as the slave devices
on Primary and Secondary IDE channels configured as software raid
devices where the two master devices on these IDE channels were
already being used for software raid. Now I have 4 devices on two IDE
channels with partition pairs configured as RAID-1 devices. So far all
the raid devices are working fine though I do expect a deterioration
in performance because of 4 devices on two channels. I would like to
reconfirm if "single ide device on each ide channel" is true for
software raid. Comments please.
It is just a performance issue, at least on hardware that works as
intended. IDE controllers can only issue one command at a time so you
can't even overlap waiting for the seeks to complete on two drives on
the same cable - but it won't break anything.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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