Roll area on disk is 0 in ST02

[denny-k]

Hi experts.

I cannot find an answer for this question. After tuning our parameters for roll area the transaction ST02 shows 0 KB for "roll area on disk".

SAP Memory         % Curr.Use Cur.use[KB Max.use[KB  In mem[KB] On disk[KB SAPCurCach Hitratio %

Roll area               0,78      2.047    104.584     262.144         0   IDs           99,77

Why? Is that normal? Because there was nothing used?

Here are my parameters:

Roll, extended and heap memory EXTM

ztta/roll_area              50000000   Byte Roll area per workprocess (total)

ztta/roll_first             1          Byte First amount of roll area used in a dialog WP

ztta/short_area             1600000    Byte Short area per workprocess

rdisp/ROLL_MAXFS            32768      8 kB Maximum roll file size

rdisp/ROLL_SHM              32768      8 kB Part of roll file in shared memory

rdisp/PG_SHM                8192       8 kB Part of paging file in shared memory

rdisp/PG_LOCAL              150        8 kB Paging buffer per workprocess

em/initial_size_MB          10000      MB   Initial size of extended memory

em/blocksize_KB             4096       kB   Size of one extended memory block

em/address_space_MB         4092       MB   Address space reserved for ext. mem. (NT only

em/global_area_MB           96         MB   Extended global memory

ztta/roll_extension         1000000000 Byte Max. extended mem. per session (external mode

abap/heap_area_dia          2000000000 Byte Max. heap memory for dialog workprocesses

abap/heap_area_nondia       2000000000 Byte Max. heap memory for non-dialog workprocesses

abap/heap_area_total        1500000000 Byte Max. usable heap memory

abap/heaplimit              40000000   Byte Workprocess restart limit of heap memory

abap/use_paging             0               Paging for flat tables used (1) or not (0)

abap/shared_objects_size_MB 20         MB   Shared objects

We are using Solaris 10:

Monitoring Category	Description	Value	Unit
Info	Operating system	SunOS sapbwp 5.10 Generic_147440-25
Info	Timestamp	13.03.2015 10:36:40
Info	Hostname	sapbwp
Virtualization Configuration	Host System Information	Solaris
Virtualization Configuration	Solution	Solaris Container
Virtualization Configuration	Solution Version	Solaris Zone
Virtualization Configuration	Type
CPU	Average processes waiting ( 5 min)	9,00
CPU	Number of CPUs	256
CPU	I/O Wait	0	%
CPU	System Utilization	0	%
CPU	User Utilization	0	%
CPU	Idle	0	%
Memory	Physical memory	52.428.800	KB
Memory	Configured swap size	78.643.200	KB
Memory	Free swap size	21.934.728	KB
Memory	Maximum swap size	78.643.200	KB
Memory	Actual swap size	78.643.200	KB
Memory	Free	247	%
Memory	Page In	0	KB/s
Memory	Page Out	0	KB/s
Memory	Page In of RAM	0	%/h
Memory	Page Out of RAM	0	%/h

Thanks in advance.

[ACE-SAP · Accepted solution]

Hello,

That does not sound abnormal, if there is enough space in the part of roll that is in memory no overflow to disk is required.

What is your system version, Roll memory has gone in 740 version...

2085980 - New features in memory management as of Kernel Release 7.40

Furthermore the Roll Memory became obsolete since SAP_KERNEL 740.

Best regards

[denny-k · Accepted solution]

Thank you!

On this system we have got 7.3 !

Thanks!