We have currently a couple of DB2 machines with logical volumes on MOD-9 ECKD disks. On our DB2 production server we have mdcache enabled for the logical volumes that contains the DB2 data. The other servers have mdcache disabled.
We already use the DIAG driver for the swap disks and the VDISKs. Now I'm looking if it is interesting to switch the other disks to DIAG too. Disks are currently formatted with cdl. I've read that cdl and DIAG can't work together so the disks have to be formatted to another format. We will be migrating to a new Z196 and a new DS8800, so I can use the downtime to switch the logical volume to an LV with DIAG disks a couple of questions: 1) Are there any disadvantages of formatting disks as ldl instead of cdl? 2) Is it true that /boot directory has to be located on a non-DIAG disk? 3) What kind of performance improvement can I expect from a move to DIAG dasd 4) Any disadvantages of using DIAG instead of ECKD? Best regards Samir Reddahi System Engineer | Systeem MF, AS400, DBA Operations T +32 9 235 61 09 | M +32 478 80 68 30 samir.redd...@securex.be www.securex.be - Confidentiality Notice - This communication and the information it contains is intended (a) for the person(s) or organization(s) named above and for no other person or organization, and (b) may be confidential, legally privileged and protected by law. Unauthorized use, copying or disclosure of any of it may be unlawful! If you receive this communication in error, please notify us immediately, destroy any copies and delete it from your computer system. Please consult our disclaimer on our site www.securex.eu Thank you.
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