[DRBD-user] external metadata on ssd vs bcache

James Harper james.harper at bendigoit.com.au
Wed Feb 27 23:26:26 CET 2013

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

> I wouldn't expect anything like the gains of bcache/flashcache/enhencio.
> Normally internal metadata are just as fast, thanks to the write cache
> of your disks and RAID adapter. Those are much faster than SSDs and
> metadata are small enough.
> However you may benefit from external metadata when your those caches
> are saturated by writes (high throughput for a long time).
> If you do have an SSD and expect big writes, give it a try and please
> tell us if it really makes a difference.

My raid is linux sw raid. No write cache.


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