More than 2 Gb of swap

Hi,

On a system with Linux RedHat AS 3.0 (kernel 2.4.21-20.ELsmp) with an
AMD Opteron, I have got 4 GB of RAM and 8 GB of swap. These 8 GB of
swap are on only one partition.

According to the man of mkswap (The maximum useful size of a swap area
now depends on the architecture. It is roughly 2GiB on i386, PPC,
m68k, ARM, 1GiB on sparc, 512MiB on mips, 128GiB on alpha and 3TiB on
sparc64).
This rule imposes 4 partitions of 2G to have 8 GB.

With only one swap partition of 8 GB, a top displays that I have 8 GB
of total swap. By making the server swapping, I have this:
Swap: front 8388472k, 4193584k used, 4194888k free 2265020k cached
Thus seems working in spite of this rule.

On the other hand, SNMP gives this information on the swap:
Total swap: 2 GB/Swap uses: 2 GB

It should be noted that SNMP counters can contain data largely higher
than 2 GB. Results given by top and those obtained by SNMP are
contradictory. Which is the maid; which is distorts it?

Sylvain

.

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