Release 5.0.7 Kernel Tunables Comparison

Some applications and system configurations require non-default kernel tunable parameters. Since Release 5.0.7, some kernel parameters have changed names, some have been removed, and others have changed behavior. New kernel parameters have also been added.

Customers upgrading from Release 5.0.7 can refer to the comparison table below to determine how to adjust their accustomed tunable settings based on the kernel parameters supported in Release 6.

For the convenience of upgrade customers, the table is organized according to the kernel parameters description sections in the Release 5.0.7 Performance Guide kernel parameters chapter. Select one of the links below to jump to the appropriate part of the comparison table.

Note that not all Release 6 tunables are mentioned in the table below. For the complete reference, please see Configuring kernel parameters in the Release 6 documentation.

Kernel tunables are displayed and changed using either the scoadmin hardware graphical interface, the configure(ADM) script, or the idtune(ADM) command.

In the table, the Release 5.0.7 kernel tunable parameters are shown with their Release 6 equivalents and notes. The tunables are linked to their descriptions in the Release 5.0.7 and Release 6 online documentation. Refer to the linked documentation for details on each parameter.

Release 5.0.7 Performance Guide
Documentation Links
Release 5.0.7
Parameters
Release 6
Parameters / Notes / Links
Buffer management NBUF
NHBUF
NMPBUF
NBUF
NHBUF
NPBUF
PUTBUFSZ PUTBUFSZ
BDFLUSHR
NAUTOUP
FDFLUSHR
NAUTOUP
NHINODE
PLOWBUFS
BFREEMIN
Obsolete.
Processes and paging GPGSLO GPGSLO
Also see:
Process Aging Parameters
GPGSHI
MINARMEM
MINASMEM
MAXSLICE
SPTMAP
Obsolete.
Memory management parameters MAXSC
MAXFC
Obsolete. See:
Paging Parameters and
Swapping Parameters.
TTYs NCLIST
TTHOG
Obsolete. The clist
mechanism is not used
in the Release 6 kernel.
Name cache CACHEENTS Obsolete. See:
DNLCSIZE
Name cache parameters HASHQS
Asynchronous I/O NAIOPROC
NAIOREQ
NAIOBUF
NAIOHBUF
NAIOREQPP
NAIOLOCKTBL
Obsolete. See
AIO_LISTIO_MAX
NUMAIO
Virtual disks VDUNITMAX
VDJOBS
VDUNITJOBS
VDHASHMAX
VDASYNCPARITY
VDASYNCWRITES
VDASYNCMAX
VDWRITEBACK
VDRPT
Obsolete. Release 5 virtual
disks are not supported.
User and group configuration NOFILESSFNOLIM
HFNOLIM
ULIMITSFSIZLIM
HFSIZLIM
MAXUPMAXUP
MAXUMEMSVMMLIM
NGROUPSNGROUPS_MAX
CMASK
IOV_MAX
Obsolete.
CHOWN_RESRSTCHOWN
Security SECLUID
SECSTOPIO
SECCLEARID
SECLUID
SECSTOPIO
SECCLEARID
TTY and console configuration TBLNKTBLNK
NSCRN
SCRNMEM
Obsolete.
NSPTTYSNUMREGPT
NUMSCOPT
NUMXT
NUMSXT
Obsolete. The xt
and sxt driver are
no longer supported.
Filesystem configuration MAXVDEPTH
MINVTIME
ROOTCHKPT
ROOTLOG
ROOTSYNC
MAXVDEPTH
MINVTIME
ROOTCHKPT
ROOTLOG
ROOTSYNC
ROOTNOCOMP
ROOTMAXVDEPTH
ROOTMINVTIME
DOSNMOUNT
Obsolete.
DOSNINODEDOSFSINODE
Table limits TBLPAGES
TBLDMAPAGES
TBLLIMIT
TBLSYSLIMIT
TBLMAP
MAX_DISK
MAX_INODE
MAX_PROC
MAX_FILE
MAX_REGION
MAX_MOUNT
Obsolete. The
Release 6 kernel
manages these internal
tables dynamically.
MAX_FLCKRECFLCKREC
STREAMS NSTREAM
NSTRPAGES
STRSPLITFRAC
STRMAXBLK
NUMSP
NUMTIM
NUMTRW
Obsolete.
STRMSGSZSTRMSGSZ
STREAMS parameters NMUXLINKObsolete.
NSTRPUSH
NLOG
STRCTLSZ
NSTRPUSH
NLOG
STRCTLSZ
Message queues MSGMAP
MSGMAX
MSGMNB
MSGSEG
MSGMAP
MSGMAX
MSGMNB
MSGSEG
Message queue parameters MSGMNI
MSGTQL
MSGSSZ
MSGMNI
MSGTQL
MSGSSZ
Event queues EVQUEUES
EVDEVS
EVDEVSPERQ
Obsolete. Event queues
are no longer supported.
Semaphores SEMMAP
SEMMNI
SEMMNU
SEMMAP
SEMMNI
SEMMNU
XSEMMAXObsolete.
Semaphore parameters SEM_NSEMS_MAXObsolete.
SEMMSL
SEMOPM
SEMUME
SEMVMX
SEMAEM
SEMMNS
SEMMSL
SEMOPM
SEMUME
SEMVMX
SEMAEM
SEMMNS
Shared memory SHMMAX
SHMMIN
SHMMAX
SHMMIN
XSDSEGS
XSDSLOTS
Obsolete.
Shared memory parameters SHMMNISHMMNI
Miscellaneous system parameters MAX_CFGSIZEObsolete.
PRFMAXPRFMAX
System parameters NODE
TIMEZONE
DSTFLAG
KDBSYMSIZE
Obsolete.
NCPYRIGHTNCPYRIGHT
Miscellaneous device driver
and hardware parameters
DMAEXCLDMAEXCL
CTBUFSIZE
SDSKOUT
KBTYPE
VGA_PLASMA
NSHINTR
DO387CR3
DOWPCR0
MODE_SELECT
Obsolete.
Hardware and device driver
parameters
NAHACCB
NKDVTTY
Obsolete.
NEMAPNEMAP
Boot load extension
parameters
EXTRA_NDEV
EXTRA_NEVENT
EXTRA_NFILSYS
MAX_BDEV
MAX_CDEV
Obsolete.
LAN Manager Client Filesystem
parameters
LMCFS_BUF_SZ
LMCFS_LMINUM
LMCFS_NUM_BUF
LMCFS_NUM_REQ
Obsolete. The LAN Manager
Client is no longer supported.


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