Questions on using BtrFS for fileserver

[M G Berberich <btrfs@oss.m-berberich.de>]

Hello,

we are thinking about using BtrFS on standard hardware for a
fileserver with about 50T (100T raw) of storage (25×4TByte).

This is what I understood so far. Is this right?

· incremental send/receive works.

· There is no support for hotspares (spare disks that automatically
  replaces faulty disk).

· BtrFS with RAID1 is fairly stable.

· RAID 5/6 spreads all data over all devices, leading to performance
  problems on large diskarrays, and there is no option to limit the
  numbers of disk per stripe so far.

Some questions:

· There where reports, that bcache with btrfs leads to corruption. Is
  this still so?

· If a disk failes, does BtrFS rebalance automatically? (This would
  give a a kind o hotspare behavior)

· Besides using bcache, are there any possibilities to boost
  performance by adding (dedicated) cache-SSDs to a BtrFS?

· Are there any reports/papers/web-pages about BtrFS-systems this size
  in use? Praises, complains, performance-reviews, whatever…

	MfG
	bmg

-- 
„Des is völlig wurscht, was heut beschlos- | M G Berberich
 sen wird: I bin sowieso dagegn!“          | berberic@fmi.uni-passau.de
(SPD-Stadtrat Kurt Schindler; Regensburg)  | www.fmi.uni-passau.de/~berberic