Linux on IBM eServer zSeries and S/390: Performance Toolkit for VM

Chapter 5. Understanding z/VM configuration 119

5.8 Page and spool allocation

When you first install z/VM, your initial configuration has enough page and spool

allocation for the installation process. In almost all cases, this is insufficient to run

any kind of production workload, so you must increase these areas. Performance

Toolkit for VM lets you find out how much space is out there and where it is

located. First step is to execute the DEVICE CPOWNED command to navigate to

screen shown in Figure 5-16.

Figure 5-16 Page and spool, plus other CP areas (the DEVICE CPOWNED command)

򐂰 The top section shows the allocation types by size and percent used. Note

that DUMP space is optional and defaults to SPOOL if it is not defined.

򐂰 The bottom section breaks down the allocations by volume and shows which

cylinders they occupy.

In a case in which we had too much spool in use, at this point we could use the

SPOOL user command to get a list that is sorted by spool occupancy as shown in

Figure 5-17 on page 120.

FCX109 CPU 2084 SER 96A3A Interval 08:18:33 - 08:19:33 Perf. Monitor

Page / SPOOL Allocation Summary

PAGE slots available 24120 SPOOL slots available 632880

PAGE slot utilization 2% SPOOL slot utilization 13%

T-Disk cylinders avail. 50 DUMP slots available 0

T-Disk space utilization 100% DUMP slot utilization ..%

____ . . . . . . . .

< Device Descr. -> <------------- Rate/s ------------->

Volume Area Area Used <--Page---> <--Spool--> SSCH

Addr Devtyp Serial Type Extent % P-Rds P-Wrt S-Rds S-Wrt Total +RSCH

1510 3390-3 LX4RES DIRECT 1- 20 5 ... ... ... ... ... ...

T-DISK 29- 78 100 ... ... ... ... ... ...

SPOOL 79- 256 97 ... ... .0 .0 ... ...

PAGE 257- 390 2 .0 .0 ... ... .0 .2

158C 3390-3 LX4SP1 SPOOL 1-3338 9 .0 .0 .0 .0 .0 .0

Note: This command lists only CP-owned volumes that have at least one of

the CP area types defined on them.

120 Linux on IBM Eserver zSeries and S/390: Performance Toolkit for VM

Figure 5-17 Spool occupancy by user

The top user, PERFAPP, has only two files but, obviously, they are large. Put the

cursor on PERFAPP and press Enter to show its files in Figure 5-18.

Figure 5-18 User’s list of spool files

Here you are given the opportunity to purge (P) one or both files.

FCX120 CPU 2084 SER 96A3A Status 09:05:16 Perf. Monitor

All Files

SPOOL File Overview Reader Printer Punch System Total

Number of files 186 106 6 31 329

Number of blocks 34935 6425 6 7997 49363

Number of records 1093159 265785 105 7943 1366992

Owner-ID Files Blocks Owner-ID Files Blocks Owner-ID Files Blocks

PERFAPP 2 23785 >System< 31 7997 VMRTM 17 5471

LNXSU1 12 3341 LNXSU4 3 3332 LNXRH1 3 2738

TIBO 28 1393 DATAMOVE 12 353 DIRMAINT 12 353

OPERATOR 50 207 TCPMAINT 55 135 COSTA 26 90

MAINT 27 64 PVM 2 33 TCPIP 1 9

///////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////

DITOMMAD 1 1 HELD 1 1 PERFLIV 1 1

PERFMAR 1 1 HAIMO 1 1 OPERATNS 2 0

FCX121 CPU 2084 SER 96A3A Status 09:10:50 Perf. Monitor

Owner PERFAPP

SPOOL File Overview Reader Printer Punch System Total

Number of files 2 0 0 0 2

Number of blocks 23785 0 0 0 23785

Number of records 668364 0 0 0 668364

S OriginID File Class Que Ac Blocks Records Date Time Name Type

. PERFAPP 0003 A PRT RDR 11939 335643 2004/03/15 14:40 VMLINUX4 DUMP

. PERFAPP 0002 A PRT RDR 11846 332721 2004/03/15 14:32 VMLINUX4 DUMP

Note: For instructions for adding page or spool space, see, “How to add page

space to a running z/VM system” on page 224.