On Tue, 2011-03-15 at 15:26 +0000, James wrote: > Bill Kenworthy <billk <at> iinet.net.au> writes: > > > > I have recently added a WD 2TB green drive to two systems and am finding > > terrible performance with btrfs on an LVM using these drives. > > Hmmmm, I've been contemplating btrfs on some new installs > with the eventual goal of a CEPH network file system, on top > of ext4 and/or btrfs. Is this issue just with the drivers, or > related to btrfs too? > same plan as mine :)
> How is btrfs , from the "driver's seat"? > Some early corruption that was due to a failing (old/ancient) HD - easily fixed using online fsck until I realised it was caused by the hardware and removed the drive (actually it finally died!). I have had one instance of a more serious corruption caused by some bug in btrfs that needed the latest btrfsck from git to fix offline - later kernels do not suffer from this apparently. Otherwise I have been hammering it as a dirvish backup server and except for speed its fine - and I wont be able to confirm that the speed issue is btrfs's fault until I get the partitioning correct - and dirvish is somewhat unique in what it does so it could be a special case. > Does this aberration you detail, extend to the Green Seagate 2T drives? > No idea :) > > I just saw on the mythtv list about the sector size problem these drives > > Can you give a precise link to this list or can I follow it (read only) > via net news? (if so what is the news group name)? google for adf and 4k sectors > > I'd like to read up on this issue, as I have several gentoo installs > (very soon) that will have RAID1 using (2) ST 2T green drives. > > Alternative RAID configs and performance/reliability results is > also of keen interest to many; so thanks for posting about these > issues. > > > James > > Read up about raid and the model of green drive you are contemplating - not all are compatible from what I have read. Billk
