Solution : https://service.sap.com/sap/support/notes/1112627 (SAP Service marketplace login required)
Summary :
This SAP Note addresses incorrect swap sizing issues on HP-UX systems. It emphasizes the role of swap space in memory management, highlighting the necessity of having sufficient swap space to support memory reservations by system processes. The concept of pseudo-swap is explained, where a portion of RAM functions as virtual swap, enhancing system capability to reserve space, but not for paging. Key administrative guidelines include using commands like 'swapinfo -tam' to inspect swap usage and configuring an equitable amount of swap relative to RAM to ensure effective system performance. Recommendations and detailed configuration steps are provided for managing and sizing swap appropriately, especially for environments running SAP applications. Attention is drawn to ensuring that the configured swap can cover the system memory demands without excessive paging, thereby maintaining optimal system response and stability.
Key words :
typical unix environment sap recommends configuring total swap space, doclocale=en&docid=emr_na-c01008941 hp-ux memory usage -, mb> /dev/< vgname>/<lvname> <block device filename> 3, doclocale=en&docid=emr_na-c00904894 chapter, /bc/docs/support/supportmanual/c01922595/c01922595, doclocale=en&docid=emr_na-c01161061-4, /dev/<vgname>/<lvname> /swap swap defaults 0 0 4, managing hp-ux swap space, hp-ux pseudo swap feature, hp-ux feature called
Related Notes :
| 1457063 | SAP on HP-UX: Consolidating SAP Systems |
| 1428079 | SAP Instance failing to start "Not enough space" |
| 1075118 | SAP on HP-UX: FAQ |
| 308375 | 64-bit SAP software |
| 172747 | SAP on HP-UX: OS kernel parameter recommendations |
| 153641 | Swap space requirement for R/3 64-bit kernel |
| 146528 | Configuration of R/3 on hosts with much RAM |
| 146289 | Parameter Recommendations for 64-Bit SAP Kernel |
| 21960 | Several instances/systems on one UNIX computer |