Marc MERLIN posted on Tue, 07 Jan 2014 19:22:58 -0800 as excerpted:
On Fri, Jan 03, 2014 at 09:34:10PM +, Duncan wrote:
IIRC someone also mentioned problems with autodefrag and an about 3/4
gig systemd journal. My gut feeling (IOW, *NOT* benchmarked!) is that
double-digit MiB files
On 2014/01/06 12:57 AM, Roman Mamedov wrote:
Did you align your partitions to accommodate for the 4K sector of the EARS?
I had, yes. I had to do a lot of research to get the array working
optimally. I didn't need to repartition the spare so this carried over
to its being used as an OS disk.
On Fri, Jan 03, 2014 at 09:34:10PM +, Duncan wrote:
IIRC someone also mentioned problems with autodefrag and an about 3/4 gig
systemd journal. My gut feeling (IOW, *NOT* benchmarked!) is that double-
digit MiB files should /normally/ be fine, but somewhere in the lower
triple digits,
On Fri, Jan 03, 2014 at 09:34:10PM +, Duncan wrote:
Thank you for that tip, I had been unaware of it 'till now.
This will make my virtualbox image directory much happier :)
I think I said it, but it bears repeating. Once you set that attribute
on the dir, you may want to move the
On Jan 4, 2014, at 11:39 PM, Marc MERLIN m...@merlins.org wrote:
Nope, I never posted anything until now. Hopefully you agree that it's
not ok for btrfs/kernel to just kill my system for over 2H until I power
it off before of defragging one file. I did hit a severe performance but
if it's
On 01/05/2014 12:09 PM, Chris Murphy wrote:
I haven't read anything so far indicating defrag applies to the VM
container use case, rather nodatacow via xattr +C is the way to go. At
least for now.
Can you elaborate on the rationale behind database or VM binaries being
set nodatacow? I
Jim Salter posted on Sun, 05 Jan 2014 12:54:44 -0500 as excerpted:
On 01/05/2014 12:09 PM, Chris Murphy wrote:
I haven't read anything so far indicating defrag applies to the VM
container use case, rather nodatacow via xattr +C is the way to go. At
least for now.
Well, NOCOW from the get-go
On Dec 31, 2013, at 4:46 AM, Sulla su...@gmx.at wrote:
Dear all!
On my Ubuntu Server 13.10 I use a RAID5 blockdevice consisting of 3 WD20EARS
Sulla is this md raid5? If so can you report the result from mdadm -D
mddevice, I'm curious what the chunk size is. Thanks.
Chris Murphy--
To
On Jan 5, 2014, at 12:57 PM, Duncan 1i5t5.dun...@cox.net wrote:
But I do very little snapshotting here, and as a result hadn't considered
the knockon effect of 100K-plus extents in perhaps 1000 snapshots.
I wonder if this is an issue with snapshot aware defrag? Some problems were
fixed
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Dear Chris!
Certainly: I have 3 HDDs, all of which WD20EARS. Originally I wanted to
let btrfs handle all 3 devices directly without making partitions, but
this was impossible, as at least /boot needed to be ext4, at least back
then when I set up the
On Sun, 05 Jan 2014 08:42:46 -0500
Jim Salter j...@jrs-s.net wrote:
On Jan 5, 2014 1:39 AM, Marc MERLIN m...@merlins.org wrote:
On Fri, Jan 03, 2014 at 09:34:10PM +, Duncan wrote:
Yes, I got that. That why I ran btrfs defrag on the files after that
Why are you trying to defrag an
On 2014/01/05 11:17 PM, Sulla wrote:
Certainly: I have 3 HDDs, all of which WD20EARS.
Maybe/maybe-not off-topic:
Poor hardware performance, though not necessarily the root cause, can be
a major factor with these errors.
WD Greens (Reds too, for that matter) have poor non-sequential
On Mon, 06 Jan 2014 00:36:22 +0200
Brendan Hide bren...@swiftspirit.co.za wrote:
I had 8x 1.5TB WD1500EARS drives in an mdRAID5 array. With it I had a
single 250GB IDE disk for the OS. When the very old IDE disk inevitably
died, I decided to use a spare 1.5TB drive for the OS. Performance
On Jan 5, 2014, at 2:17 PM, Sulla su...@gmx.at wrote:
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Dear Chris!
Certainly: I have 3 HDDs, all of which WD20EARS.
These drives don't have a configurable SCT ERC, so you need to modify the SCSI
block layer timeout:
echo 120
On Jan 5, 2014, at 4:48 PM, Chris Murphy li...@colorremedies.com wrote:
On Jan 5, 2014, at 2:17 PM, Sulla su...@gmx.at wrote:
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Dear Chris!
Certainly: I have 3 HDDs, all of which WD20EARS.
These drives don't have a configurable SCT ERC,
On Jan 5, 2014, at 3:36 PM, Brendan Hide bren...@swiftspirit.co.za wrote:
WD Greens (Reds too, for that matter) have poor non-sequential performance.
An educated guess I'd say there's a 15% chance this is a major factor to the
problem and, perhaps, a 60% chance it is merely a small
On Jan 5, 2014, at 5:15 PM, Chris Murphy li...@colorremedies.com wrote:
On Jan 5, 2014, at 3:36 PM, Brendan Hide bren...@swiftspirit.co.za wrote:
WD Greens (Reds too, for that matter) have poor non-sequential performance.
An educated guess I'd say there's a 15% chance this is a major
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Thanks Chris!
Thanks for your support.
echo 120 /sys/block/sdX/device/timeout
timeout is 30 for my HDDs. I'm well aware that the WD green HDDs are not
the perfect ones for servers, but they were cheaper - and quieter - than
the black ones for
On Jan 5, 2014, at 5:25 PM, Sulla su...@gmx.at wrote:
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Thanks Chris!
Thanks for your support.
echo 120 /sys/block/sdX/device/timeout
timeout is 30 for my HDDs.
I don't think those drives support a configurable time out; the Green hasn't
On Jan 5, 2014, at 6:29 PM, Sulla su...@gmx.at wrote:
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Hi Chris!
# sudo smartctl -l scterc /dev/sda
tells me
SCT Error Recovery Control command not supported
you're right. the /sys/block/sdX/device/timeout file probably is useless then.
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On 03/01/14 09:25, Marc MERLIN wrote:
Is there even a reason for this not to become a default mount option
in newer kernels?
autodefrag can go insane because it is unbounded. For example I have a
4GB RAM system (3.12, no gui) that kept hanging. I
Oh gosh, I don't know what went wrong with my btrfs root filesystem, and I
probably will never know, too:
The sudo balance start / was running fine for about 4 or 5 hours, running
at a system load of ~3 when balance status / told me the balancing was on
its way and had completed 19 out of 23
Kai Krakow posted on Fri, 03 Jan 2014 02:24:01 +0100 as excerpted:
Duncan 1i5t5.dun...@cox.net schrieb:
But because a full balance rewrites everything anyway, it'll
effectively defrag too.
Is that really true? I thought it just rewrites each distinct extent and
shuffels chunks around...
First, a big thank you for taking the time to post this very informative
message.
On Wed, Jan 01, 2014 at 12:37:42PM +, Duncan wrote:
Apparently the way some distribution installation scripts work results in
even a brand new installation being highly fragmented. =:^( If in
addition they
Marc MERLIN posted on Fri, 03 Jan 2014 09:25:06 -0800 as excerpted:
First, a big thank you for taking the time to post this very informative
message.
On Wed, Jan 01, 2014 at 12:37:42PM +, Duncan wrote:
Apparently the way some distribution installation scripts work results
in even a
Sulla posted on Wed, 01 Jan 2014 20:08:21 + as excerpted:
Dear Duncan!
Thanks very much for your exhaustive answer.
Hm, I also thought of fragmentation. Alhtough I don't think this is
really very likely, as my server doesn't serve things that likely cause
fragmentation.
It is a
Duncan 1i5t5.dun...@cox.net schrieb:
But because a full balance rewrites everything anyway, it'll effectively
defrag too.
Is that really true? I thought it just rewrites each distinct extent and
shuffels chunks around... This would mean it does not merge extents
together.
Regards,
Kai
--
Dear Duncan!
Thanks very much for your exhaustive answer.
Hm, I also thought of fragmentation. Alhtough I don't think this is really
very likely, as my server doesn't serve things that likely cause fragmentation.
It is a mailserver (but only maildir-format), fileserver for windows clients
(huge
Dear all!
On my Ubuntu Server 13.10 I use a RAID5 blockdevice consisting of 3 WD20EARS
drives. On this I built a LVM and in this LVM I use quite normal partitions
/, /home, SWAP (/boot resides on a RAID1.) and also a custom /data
partition. Everything (except boot and swap) is on btrfs.
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