Re: How long to initialize disk?

[prumschlag@xxxxxxxxxx]

Rob,

It's not a straight line graph.  That's why I say the number of disks in my
experience did not seem to make much difference.  DST apparently is working on
all the drives concurrently.  Also, my statistics included the time to "unload"
the data from the drives onto other drives in the current ASP.  I'm assuming you
won't be doing that(?).

It seems that what you are doing would not be all that uncommon.  Any chance you
could get Rochester to take a guess at it?  I went to a COMMON session a few
years ago where the speaker was an IBM Disk Processing expert.  If you are
interested I could try to dig out his contact information.

Phil

   Subject: Re: How long to initialize disk?
   To: midrange-l@midrange.com
   From: rob@dekko.com
   Date: Thu, 6 Dec 2001 16:04:58 -0500
   Reply-To: midrange-l@midrange.com


   Phil,

   This is the kind of information I was looking for.  Nervous about that data
   though.  I don't have 75 hours to spend.

   Anyone else have some samples?  I guess we should have kept our stop
   watches handy the last several times we added dasd.

   Rob Berendt

   ==================
   "They that can give up essential liberty to obtain a little temporary
   safety deserve neither liberty nor safety."
   Benjamin Franklin



                       prumschlag@phdinc.c
                       om                        To:     midrange-l@midrange.com
                       Sent by:                  cc:
                       midrange-l-admin@mi       Fax to:
                       drange.com                Subject:     Re: How long to
   initialize disk?


                       12/06/2001 12:04 PM
                       Please respond to
                       midrange-l








   Rob,

   What do you mean by initialize?  Like FORMAT C:?

   This may not be relevant, but we recently moved some disks from one ASP to
   another on our single AS/400.  We actually did this is three passes.  Each
   pass
   took between 45 and 60 minutes.  The size of the disks (4 or 8 GB), the
   speed of
   the disks, or the number of disks (1,2 or 3) did not seem to make much
   difference.

   Another bit of worthless information:  We also added a single new disk
   drive (8
   GB, 10 k rpm).  I did not watch the clock when it we added it to the RAID
   set,
   but I'm guessing it was about 20 minutes.  Two days later we added it to an
   existing ASP.  That took another 30 minutes running under DST.

   Phil

      Subject: How long to initialize disk?
      To: midrange-l@midrange.com
      From: rob@dekko.com
      Date: Thu, 6 Dec 2001 11:38:42 -0500
      Reply-To: midrange-l@midrange.com


      We are moving several drives from one iSeries to our new 840-2418-1542
      (geepers is that sob huge!).  Any estimates on how long it will take to
      initialize the following:

      qty  model
      30   6717
      45   6718


      Rob Berendt

      ==================
      "They that can give up essential liberty to obtain a little temporary
      safety deserve neither liberty nor safety."
      Benjamin Franklin