On Mon, Aug 1, 2011 at 10:36 AM, Shedlock, George <gshedl...@aegonusa.com>wrote:
> We are conducting a proof of concept for one of our divisions. This > includes DB/2 9.7 and Suse 10 SP 3 with CKD dasd. > > The first opportunity is the defines of tablespaces. In our x86 > environment, this runs in less that 3-4 minutes (yes, there are a lot of > tables). In our z/Linux guest that same set of defined runs in about 3-4 > HOURS!. The only thing we have seen as far as activity is a very large > number of disk I/O's to dasd. The tables define approx. 800-900 GB. What we > think we are seeing is that the table spaces are being formatted. > > We have tried the "no file system caching" option on the define, but is > flagged as an invalid option. IBM is saying that this is the default, but > after the tables are defined and we look at the tables, we see that the > option is turned on. If we then try to turn it off, it is again flagged as > an invalid option. > > No file system cache is not supported for ckd, only FB disks.... here we have a lot of machines running z/linux SuSe Sp4 with DB2 9.7 .. but, we use ckd for operation system and FB for data partitions. No performace problems related with this enviroment :) > Are there any other options that we can use? > > George Shedlock Jr > AEGON Information Technology > AEGON USA > 502-560-3541 > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
