HP Ignite-UX manual 57

} else {

size = 112Mb

}
} else {
size = 300Mb
}	= true
contiguous_allocation
bad_block_relocate	= false

}

300MB is the default for large disk configurations because additional Dynamically Loadable Kernel Modules (DLKMs) require more space in /stand.

Now at this stage you might be wondering why you had to make sure that you set up those logical volumes with certain values for contiguous allocation and bad block relocation. Table 3 contains a brief summary of the reasons.

Table 3

Name	Contiguous	Bad Block	Reason
	Allocation	Relocation33
/	TRUE	FALSE	The root file system must be usable before the volume manager is
			active to enable this. It cannot allow the volume manager to relocate
			blocks and it must be contiguous on a disk.
Primary	TRUE	FALSE	Primary swap is activated before the volume manager is active, so it
swap			requires the same options as the root file system.
Dump	TRUE	FALSE	A dump is written when no volume manager is active; because of
space			this, it must be contiguous, and cannot have bad blocks relocated
			by the volume manager.
Secondary	N/A	N/A	Secondary swap has no requirements unless it is also a dump
swap			space; in which case, it has the dump space requirements.
/stand	TRUE	FALSE	The /stand volume is read by the boot loader. The boot loader
			knows nothing about volume managers and currently only
			understands HFS34 file systems, so the file system must be contiguous
			and cannot have bad block relocation enabled.

Note:

On HP-UX B.11.11, it is assumed that all IODC (I/O Dependent Code) in firmware can perform operations with up to 4GB offsets35. For some I/O controllers this limits the maximum offset for dump. Newer systems have block-based I/O implemented in IODC. This allows the offset of an I/O operation to be given in blocks not bytes. This change dramatically increases the amount allowed for offset of dump spaces on most new I/O interfaces. Itanium®-based systems do not have a 4GB

33This is bad block relocation performed by a volume manager not automatic relocation performed by the disk drives.

34Itanium®-based systems may have /stand as a VxFS file system. The HFS restriction is applicable only to PA-RISC systems.

35Various combinations of 2GB and 4GB offsets (depending on the I/O interface) were allowed in older releases of Ignite- UX (before B.3.0 and in all of the A.x.x versions).

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