Error Code details |
V-5-1-15061 |
Severity: | n/a |
Component: | Volume Manager |
Message: |
The amount of buffer space available for requests coming
in to the Secondary over the network is determined by the
VVR tunable, vol_max_nmpool_sz which defaults to 16
megabytes. VVR allocates separate buffer space for each
Secondary RVG, the size of which is equal to the value of
the tunable vol_max_nmpool_sz. The buffer space on the
Secondary must be large enough to prevent slowing the
network transfers excessively. If the buffer is too large,
it can cause problems. When a write arrives at the Secondary,
the Secondary sends an acknowledgement to the Primary so
that the Primary knows the transfer is complete. When the
write is written to the data volume on the Secondary, the
Secondary sends another acknowledgement, which tells the
Primary that the write can be discarded from the SRL.
However, if this second acknowledgement is not sent within
one minute, the Primary disconnects the RLINK. The RLINK
reconnects immediately but this causes disruption of the
network flow and potentially other problems. Thus, the
buffer space on the Secondary should be sized in such a way
that no write can remain in it for one minute. This size
depends on the rate at which the data can be written to the
disks, which is dependent on the disks themselves, the I/O
buses, the load on the system, and the nature of the writes
(random or sequential, small or large). For more information
on using this tunable, refer to VVR Planning and Tuning Guide |
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