IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

250 IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

INTRA-POLICY: edge UPPER BOUND: 8

MOUNT POINT: N/A LABEL: None

MIRROR WRITE CONSISTENCY: on/ACTIVE

EACH LP COPY ON A SEPARATE PV ?: yes (superstrict)

Serialize IO ?: NO

STRIPE WIDTH: 8

STRIPE SIZE: 256k

DEVICESUBTYPE : DS_LVZ

{CCF-part2:root}/tmp/perf/scripts -> lvmap.ksh 16gslv

LV_NAME RANK COPIES IN BAND DISTRIBUTION

16gslv:N/A

vpath0 0000 129:000:000 100% 128:001:000:000:000

vpath1 fffe 129:000:000 100% 128:001:000:000:000

vpath2 fffc 129:000:000 100% 128:001:000:000:000

vpath3 fffa 129:000:000 100% 128:001:000:000:000

vpath4 ffff 129:000:000 100% 128:001:000:000:000

vpath5 fffd 129:000:000 100% 128:001:000:000:000

vpath6 fffb 129:000:000 100% 128:001:000:000:000

vpath7 fff9 129:000:000 100% 128:001:000:000:000

Notice the balance in the distribution of the logical volume on the LUNs! To see this we used

the lvmapt.ksh shell script in Appendix B, “UNIX shell scripts” on page 481.

7.8.3 Creating the file system

One of the goals of this chapter has been to explain how to best use storage from the DS6000

to get the best storage related performance out of your UNIX server. With the creation of the

logical volumes, this work is largely complete. The questions surrounding how to utilize the

DS6000 for best performance have largely been answered. Everything else we do to prepare

this storage for the applications is basically operating system related activities.

Create a jfs2 file system on an logical volume with INLINE log

To make a striped jfslog and logical volume called stripedlv we used the mklv commands:

򐂰 Format the inter-disk jfs2log:

logform -V jfs2 /dev/jfs2log01

򐂰 Create a jfs2 file system on the 305 GB inter-disk logical volume

crfs -v jfs2 -d 305glv -m /interdiskfs -A yes -p rw -a logname=/dev/jfs2log01

Create a jfs2 file system on an logical volume with OUTLINE log

򐂰 Create a jfs2 file system on the 305 GB inter-disk logical volume

crfs -v jfs2 -d 305glv -m /interdiskfs -A yes -p rw -a logname=INLINE

In Example 7-37, we use the above command to create a file system and then we look at the

file system specifics.

Example 7-37 Inter-disk file system creation

{CCF-part2:root}/tmp/perf/scripts -> crfs -v jfs2 -d 305glv -m /interdiskfs -A yes -p rw -a

logname=/dev/jfs2log01

File system created successfully.

319936784 kilobytes total disk space.

New File System size is 639893504

{CCF-part2:root}/tmp/perf/scripts -> grep -p interdiskfs /etc/filesystems

/interdiskfs:

Note: The use of INLINE jfs2 logs is preferred to outline logs. Inline logs are created when

the filesystem is created.