[DRBD-user] DRBD with SSD primary, spindle drive secondary, buckets, funnels, and pipes

Arnold Krille arnold at arnoldarts.de
Fri Sep 21 19:16:49 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Friday 21 September 2012 13:12:47 Andrew Eross wrote:
> Thanks Lars, that really helped! I totally get what you're saying here now.
> I've sent off a request to the sales linbit folks to ask about a proxy
> trial. More out of experimental curiosity than anything I'd be interested
> to give that a shot to see what happens with our SSD/spindle combination...
> realistically we'll just need to go fork over the money and buy a 2nd SSD
> for our secondary box and call it a day.

If you are more interested in low latency and high number of concurrent access 
then plain throughput, our experience shows that a hdd with meta-data on ssd 
(or second hdd) gives far better results then only one hdd.

But when you can go with one ssd in each server for the whole drbd resource, 
that is fine too. Remember to only use 75-90% of the ssd...

Have fun,

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