DRBD performance question ?
Thu, 7 Mar 2002 09:19:47 -0800 (PST)
> Right! In the "drbd_paper_for_NLUUG_2001.ps.gz"
> paper you will find the
> following paragraph:
> 4.1 Protocol A
> Protocol A signals the completion of a write
> request as soon as we have
> written the block to the local disk and sent it out
> to the network. We
> signal the completion of the operation without
> knowing wether the block
> has arrived or will arrive on the disk of the
> In case you write a stream of data that is
> considerabely larger than the
> memory of your machines, you have got these limiting
> factors for performance:
> Protocol A:
> 1) Throughput & latency of your local disk
> 2) Throughput of your network connection
> 3) Throughput of your remote disk
If in protocol A we signal I/O completion as soon
as we write to the local disk and the local network,
why would the write I/O performance of node 1
(primary) depend on the network throughput or the I/O
throughput of the remote disk ?
I apologise if I am missing something obvious ?
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