[DRBD-user] replication link stability
arnold at arnoldarts.de
Thu Feb 16 16:30:36 CET 2012
On Thursday 16 February 2012 15:18:05 Piotr Kandziora wrote:
> I have two servers with dedicated replication link (WiFI - 48Mbit/s). My
> clients are connecting via other network link (100Mbit/s) to SAMBA service.
Sorry, spend the 10€ per server to get them dedicated 100MBit cards. It will
do you a great favour.
But unless you spend 20€ per server for Gigabit cards, it will still be slow
The wifi is not only bad for your throughput: 48MBit/s is low compared to
120MBytes/s for direct disk access. Its actually half of that because wifi is
half-duplex by design.
100MBit will be a bit better as you then have ~12MByte/s per direction.
Only Gigabit will really keep up with the throughput of the disk.
Additionally wifi has the ethernet-latency plus the wireless-latency plus the
latency of half-duplex and collision-detection.
It is a) no wonder your users will be complaining about the poor performance
(mine are still complaining while I have a dedicated GB-link) and b) its no
wonder drbd complains and stops the sync...
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