Re: Fibre Channel Storage - Access by multiple hosts
From: Jim Watson (watson_at_quattro666.freeserve.co.uk)
Date: 08/02/03
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Date: Sat, 2 Aug 2003 18:45:31 +0100
Sharona,
I understand your comments, my way of thinking at the moment is to use
disksuite to provide the stripe as the software RAID would probably be too
slow. If I can prove the concept at no extra cost then I will be in a
better position to get the finance deptartment to agree to shelling out for
what they should have bought in the first place.
This project started 4 years ago and was only recently installed. As I
don't have any experience in fibre-channel, I am hoping that this thread
will result in somebody confirming the working of the stripe through
disksuite. Ultimately, I see the hardware external RAID controller as they
way forward, at the least cost, given the equipment available already. It
is unlikely that the users (there are only 5 analysts involved) will need to
access the same files. Therefore file locking is not a major issue.
"sharona" <sallan1055@aol.com> wrote in message
news:7191cfcb.0308020303.426ae86f@posting.google.com...
> "Jim Watson" <watson@quattro666.freeserve.co.uk> wrote in message
news:<bgeku4$igj$1@newsg1.svr.pol.co.uk>...
> > I have "inherited" a project which the original integrators have dumped
with
> > not much info available. Basically the system is as follows:
> >
> > 5 solaris (2.6) hosts are connected through a 100Mb ethernet switch and
each
> > also has a Fibre Channel (FC) HBA connected through a FC switch.
> >
> > Each host requires access to a FC storage system ( JBOD -10x36GB). This
> > JBOD should have been ideally a 320GB RAID, or even a large stripe as
the
> > users have to aquire a large analogue signal, convert to digital and
dump to
> > storage before analyzing.
> >
> > I can use disksuite to create the RAID/stripe (probably stripe until a
> > hardware FC RAID controller is purchased). My main concern is that the
> > software stripe would have to be exported for use by the other users.
Does
> > this mean that the only way the other terminals can see the "big" disk
is by
> > access across the ethernet and through the host running disksuite?, or
will
> > the other hosts "see" the stripe on the FC side?
> >
> > Ideally all data transfer would be across the FC. If I can prove the
system
> > to work I intend to get the finance deptartment to sanction an external
RAID
> > controller for attaching to the JBOD and hence presenting a large drive
on
> > the FC.
> >
> > Apologies if I have made any glaring goofs on my interpretation of
> > Fibre-Channel, I was only introduced to it 48 hours ago!
> >
> >
> > Jim Watson
>
> Just one note Jim,
>
> My personal experience with the JBODs is that they are crap. If one
> disk in the array goes south, the whole array is gone. We replaced
> all of our JBODs with EMC's disk arrays with hot swapable disks.
> Believe me, restoring that amount of data is a real pain.. Better to
> have the hot swapable disks!!
>
> Sharona
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