[following up to -questions]
On Thursday, 30 September 1999 at 13:08:05 +0800, Trent Nelson wrote:
> Hi,
>
> I was planning on sending this to FreeBSD-newbies@, but due to the
> nature of the question, decided against it and sent it here.
You would have done better to send it to -questions. I'm following up
there.
> I currently have a 3.2GB Quantum HDD as my primary master, and
> an 8.4GB Quantum HDD as my primary slave. What I want to do is
> create an exact image of the 3.2GB drive as a partition on the 8.4GB
> drive, and basically set up vinum using this array of two 3.2GB
> drives/partitions.
You should put it on the secondary controller. The performance will
be much better.
> 1.) Is this possible?
Yes.
> The 8.4GB HDD is about two years newer than the 3.2GB HDD which
> leads me to the understanding that there'd be obvious access time
> discrepancies.
That's not so serious. Vinum doesn't make any assumptions about
relative speed. Obviously overall performance will be less than that
of two faster disks.
> The main thing I'm interested in is the fact I won't have two 3.2GB
> HDDs, I'll have one 3.2GB HDD, and another drive with a 3.2GB
> partition on it.
Well, you'll have as many Vinum volumes as you want. You can divide
up the space just about any way you want.
> 2.) If it is possible, would the performance gain be worth the effort
> to get it working? Note, I'm more interested in the experience I'd get
> out of it rather than huge performance gains.
That depends on how much effort it takes you :-)
> 3.) Is it possible to get SoftUpdates working with vinum?
Yes.
> Has anyone tried this?
Yes.
We're currently seeing some problems with soft updates in connection
with RAID-5, but that's not of any great relevance to your system,
since you need at least 3 disks for RAID-5.
Greg
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