gmirror on 1 or 2 IDE cables

Ted Mittelstaedt tedm at
Fri Nov 4 21:26:36 GMT 2005

>-----Original Message-----
>From: owner-freebsd-questions at 
>[mailto:owner-freebsd-questions at]On Behalf Of Steve Bertrand
>Sent: Thursday, November 03, 2005 7:28 AM
>To: gayn.winters at; freebsd-questions at
>Subject: RE: gmirror on 1 or 2 IDE cables
>> Using gmirror to mirror two identical drives, how much of a 
>> performance hit is it to have
>> 1.  Both drives on one IDE cable?
>> Compared to:
>> 2.  One drive primary on one cable and one secondary on the 
>> other cable?
>> Compared to:
>> 3.  Both drives primary but on separate IDE cables?
>My understanding that only a single drive on each IDE channel can be
>accessed at any one time.

Which may or may not matter depending on what he's doing.  Are we
talking mainly reads or writes here?


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