[SunHELP] Disk Mirroring Question

[Gregory Leblanc]

> Sure is. You'll want to use the Sun ODS package.(Online Disk Suite) This
> will allow you to mirror partitions. The disks being on the same bus will
> cost you a huge performance penalty however. You might try to beg, borrow,
> or steal another controller.


This simply isn't true.  I don't see any specifics on what drives are
being used, and I'm not intimately familiar with the Enterprise level
hardware, but I assume that these will not be top of the line drives,
and that the machine as at least a UW bus (40MB/sec).  That said, drives
1 or 2 generations old probably can't deliver more than 10MB/sec each,
so that means 3-4 drives will saturate a bus.  And you can certainly go
with more drives than that, especially if you don't expect simultaneous
access on more than a couple of drives at once.  

> > -----Original Message-----
> > From: sunhelp-admin at sunhelp.org [mailto:sunhelp-admin at sunhelp.org]On
> >
> > Hi Listers!
> >
> > The talking heads on this project I'm involved in have decided
> > that we need to mirror our Oracle database, even though we have
> > two E3000s each running replication.  My question to all you
> > listers out there is:
> >
> > Is it possible to mirror Solaris filesystems without having to
> > buy special software or hardware (in other words, can I do it for
> > free, somehow)?  I was hoping to be able to toss four more drives
> > into empty internal slots in each of the E3000s and then go from
> > there.  I realize that this solution will mean that the disks are
> > still on the same bus, but I've been told that there is no money
> > for this effort.  It's one of those, "Make it happen but don't
> > cost us a cent." type of deals.