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- What is "Simple-HA" and how does it differ from normal HA ?
- Change in the use of SCSI reservations
- How do I increase the level of debugging from RSF-1
- Where can I find documentation for the RSF-1 C/C++ API
- Why do serial heartbeats stop working?
- Known SCSI disks and PGR reservation support
- Why is my failover taking a long time?
- Reservation drives are getting 'Failed to power up' errors
- Tuning the Solaris 11.x swapfs_minfree parameter
- Recommended /etc/system settings for ZFS-based clusters
General
Tuning the Solaris 11.x swapfs_minfree parameter
On Solaris 11.2 and later, it is recommended to raised the swapfs_minfree parameter in large-memory systems:
Prior to Solaris 11.1 SRU 11 / SRU 12, a Sun Fire X4270 M3 server with 256GB RAM installed defaulted to:
# echo swapfs_minfree/D |mdb -k
swapfs_minfree:
swapfs_minfree: 8387760
Whereas afterwards including the 11.2-CURRENT, it defaults to:
# echo swapfs_minfree/D |mdb -k
swapfs_minfree:
swapfs_minfree: 1048280
Looking at the SRU release notes regarding swapfs, the following can be found:
# grep swapfs *.txt
readme_11_1_11_4_0.txt:7183295 15803141 SUNBT7183295 swapfs_minfree should be
reworked for large systems
readme_11_1_12_5_0.txt:7183295 15803141 SUNBT7183295 swapfs_minfree should be
reworked for large systems
As a workaround, consider raising the swapfs_minfree parameter in /etc/system using the formula:
GB_RAM/32*1024*1024
For a server had 392GB RAM installed, using the formula above it should be raised to 12,845,056 KB, i.e. ~12.85 GB.
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Author: Andrew Robson
Revision: 1.3
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