[rescue] SSA help

[Brian Hechinger]

On Wed, May 08, 2002 at 11:06:47AM +0100, Jeremy RJ Towers wrote:
> I believe that you can't have both channels connected to the same 
> system, or if you do there won't be any benefit. At least in terms of 
> being supported.   Veritas DMP (Dynamic Multi Pathing) will take 
> advantage of it though

DiskSuite (free!) has Alternate Pathing support.  problem is, AP doesn't do
load balancing, it just handles failover.  well, both FCOMs are on one board,
so if the board goes, so does the alternate path. ;)

but i don't care about that, this isn't a high availability setup, this is just
a machine with a JBOD on it that i can play with.  what i'd like is to get more
bandwidth.  each of these channels maxes out at 25MB/sec, which isn't the
fastest in the world, and 30 spindles can DEFINITELY push more than that.  so
i have half of my stripe accessed through one channel, and the other half of my
stripe accessed through the other channel, now i get 50MB/sec, which is much
nicer.  i only have 6 disks though, so it didn't make a huge speed difference,
but once i get these 14 disks i have here in it, and pick up the remainging 10,
i will be at max capacity and max speed.  ;)

-brian

root at zaphod# metastat
d10: Concat/Stripe
    Size: 50204880 blocks
    Stripe 0: (interlace: 64 blocks)
        Device              Start Block  Dbase
        c1t0d4s0                   0     No   
        c2t1d4s0                2160     No   
        c1t2d4s0                2160     No   
        c2t3d4s0                2160     No   
        c1t4d4s0                2160     No   
        c2t5d4s0                2160     No   
-- 
Whoops, nevermind...  the compile just imploded, crashing the xterm it was
running in as well...  Thanks, Richard...              -- George Adkins --