Understanding hardware acceleration
334 GigaStor (23 Feb 2018) — Archive/Non-authoritative version
♦
Use software-based pre-filters. They are mutually exclusive; only one may
be used.
♦
Affect statistics-based information, such as Network Trending.
There are two types of filtering that occurs in GigaStor: hardware filtering on the
capture card and software filtering in Observer.
Hardware filtering
only affects
which packets are captured on the capture card and saved to the RAID; it does
not work with any statistics-based filtering that may occur in the Observer
software, such as for Network Trending, Bandwidth Utilization with Filter, and
so on. Any packets excluded by the hardware filter are never saved to disk and
searchable by the software. In general, you want your hardware filter to allow
as many packets through as possible. This ensures the largest number of packets
are available for troubleshooting. In some cases, it is desirable to use hardware
filtering because you know you do not need certain types of traffic captured
and saved by GigaStor. Hardware filtering is only available when using hardware
acceleration; it also disables the use of software-based pre-filters.
Software
filtering
has two of its own possibilities when using hardware filtering: 1) sifting
through packets after they were written to the RAID by the capture card and 2)
controlling what is available for network trending when collecting statistics.
Hardware filtering
Filters packets before they are saved to the RAID. This disables
the ability to use software pre-filters in Observer, which rely on
the CPUs rather than the capture card to do the processing.
Software post-
filtering of packets
Filters packets saved to disk by the capture card, which may or
may not have a hardware filter applied. See
Software filtering
of network
trending
Filters statistics-based trending data, which is entirely unrelated
Choosing your network trending types
.
These are the filtering types usable on a hardware-accelerated virtual adapter:
MAC/IP Address
MPLS
Port
VLAN Tag (802.1Q)
VNTag
Features that require hardware acceleration
Some functions or features of your hardware appliance require that hardware
acceleration is turned on.
These cannot operate if hardware acceleration is turned off:
♦
Real-time packet deduplication
♦
Physical ports reused in multiple virtual adapters
♦
Hardware filters
♦
Disk read and write speeds that match advertised values
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