Very Computer

I am trying to create a striped-mirror here on an A5200 array with 22 16.9g
drives in it.  I have never used a striped-mirror before so I want to make
sure I get it right the first time (hence this email).  I used the first two
disks on each controller (one as the root disk the other as the root mirror)
and the next 9 disks on each controller I want in a raid 1+0 config (the
last disk on each controller being a hotspare).  I want this to be one large
partition to store a database on (152gb).  I will be using standard DRL
(writes are not always sequential so I want to avoid any IO hosing such as
that you can get with drlseq.  I would like to mirror it like this:

c0t17--c0t18--c0t19...c0t25--c0t26 - controller one (c0)
    |           |           |           |           |
   m         m         m         m         mirrors to
    |           |           |           |           |
c2t01--c2t02--c2t03...c2t08--c2t09 - controller two (c2)

Would the following command be correct to create it with DRL enabled and
mirror it in the fashion i stated above?

vxassist -o ordered -g vsnt01 make vsnt 152g layout=striped-mirror
logtype=drl nmirror=2 ncol=9 c0t17 c0t18...c0t26 c2t01 c2t02...c2t09

(where vsnt01 is the diskgroup name and vsnt is the partition i want to lay
out)

also, do you guys have any preferences on the stripewidth or will the
default do fine for an array this size?  Any other recommendations would be
appreciated.  Thanks.

Michael J. Ayers

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The command I would use in your situation would be,
vxassist -g vsnt01 make vsnt 152g layout=stripe-mirror mirror=ctlr

Looks like all you are missing is to specify the mirror.  I have never
had to deal with stripe width before.

--Keith

Quote:> Michael,

> The command I would use in your situation would be,
> vxassist -g vsnt01 make vsnt 152g layout=stripe-mirror mirror=ctlr

> Looks like all you are missing is to specify the mirror.  I have never
> had to deal with stripe width before.

    as far as stripe width goes, there's always veri'expensive'tas default
of 64k, but
    i have found that the best way to tune your stripe size is to adjust it
in increments
    until you find the best performance... this will be somewhat dependent
on your
    underlying block size of your files system, and the block size your
application
    wants to work with...

    unfortunately there's no steadfast rule, and it does take some
tweaking... usually
    what i do is setup my volumes, the simply do a:

        time mkfile 1g /volume/test

    record the numbers, and relayout... if your using database apps, match
the
    block sizes, then run your tests...

Ron!

v  syslogvol    -            ENABLED  ACTIVE   425955500 fsgen    -        ROUND
pl syslogvol01  syslogvol    ENABLED  ACTIVE   425955500 CONCAT   -        RW
sd datadisk01-02 syslogvol01 datadisk01 425955500 2500  LOG       c2t0d0   ENA
sd datadisk01-01 syslogvol01 datadisk01 0      425955500 0        c2t0d0   ENA
pl syslogvol02  syslogvol    ENABLED  ACTIVE   425955500 CONCAT   -        RW
sd datadisk02-02 syslogvol02 datadisk02 425955500 2500  LOG       c2t2d0   ENA
sd datadisk02-01 syslogvol02 datadisk02 0      425955500 0        c2t2d0   ENA

I'm interested to hear what others get...

-- Ole