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.

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