Skip to Main Content
IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
book

IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

by Cathy Warrick, Craig Gordon, Benoit Granier, Keitaro Imai, Rosemary McCutchen, Brannen Proctor, Jim Sedgwick, Paulus Usong, Mary Ann Vandermark, John Wickes
December 2005
Intermediate to advanced content levelIntermediate to advanced
530 pages
18h 34m
English
IBM Redbooks
Content preview from IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
Chapter 3. Logical configuration planning 63
3.5.2 Mixing open and zSeries logical disks
Open systems data is fixed block (FB) and zSeries data is count-key-data (CKD) and they are
physically different representations within the DS6000. The two data types are not able to be
mixed within an Array.
CKD
In count-key-data (CKD) organization, the data field stores the user data. Also, because the
data records can be variable in length, they all have an associated
count field that indicates
the user data record size. Then the
key field is used to enable a hardware search based on a
key. However, this is not generally used for most data anymore. Exten ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

DS8800 Performance Monitoring and Tuning

DS8800 Performance Monitoring and Tuning

Gero Schmidt, Bertrand Dufrasne, Jana Jamsek, Peter Kimmel, Hiroaki Matsuno, Flavio Morais, Lindsay Oxenham, Antonio Rainero, Denis Senin
Windows® 8.1 IN DEPTH

Windows® 8.1 IN DEPTH

Brian Knittel, Paul McFedries
IBM PowerVM Best Practices

IBM PowerVM Best Practices

Adriano de Almeida, Rafael Antonioli, Urban Biel, Sylvain Delabarre, Bartłomiej Grabowski, Kristian Milos, Fray L Rodríguez

Publisher Resources

ISBN: 0738494119Purchase book