Re: How to stress test raid6 on 122 disk array

Martin writes: > The smallest disk of the 122 is 500GB. Is it possible to have btrfs > see each disk as only e.g. 10GB? That way I can corrupt and resilver > more disks over a month. Well, at least you can easily partition the devices for that to happen. However, I

Re: BTRFS BUG at insert_inline_extent_backref+0xe3/0xf0 while rebalancing

Filipe Manana writes: > Try this (just sent a few minutes ago): > https://patchwork.kernel.org/patch/7463161/ I've been using this patch for a week now, doing two rebalances a day (one per file system) - no problem so far. Thanks! Probably unrelated to this I did experience

Re: BTRFS BUG at insert_inline_extent_backref+0xe3/0xf0 while rebalancing

Hello, Thanks for the super-fast response :). I've installed the patch and shall be waiting. The effects should be visible within a week given daily rebalances of two filesystems. -- _ / __// /__ __

BTRFS BUG at insert_inline_extent_backref+0xe3/0xf0 while rebalancing

Hello, Recently I added daily rebalancing to my cron.d (after finding myself in the no-space-situation), and not long after that, I found my PC had crashed over night. Having no sign in the logs anywhere (not even over network even though there should be) I had nothing to go on, but this night it

Re: btrfs autodefrag?

Hugo Mills writes: >It has to be disabled because if you enable it, there's a race > condition: since you're overwriting existing data (rather than CoWing > it), you can't update the checksums atomically. So, in the interests > of consistency, checksums are disabled. I

Re: btrfs autodefrag?

Austin S Hemmelgarn writes: > And that is exactly the case with how things are now, when something > is marked NOCOW, it has essentially zero guarantee of data consistency > after a crash. Yes. In addition to the zero guarantee of the data validity for the data being

Re: BTRFS raid 5/6 status

audio muze writes: > It seems to me that the simplest option at present is probably to use > each disk separately, formatted btrfs, and backed up to other drives. > The data to be stored on these drives is largely static - video and > audio library. In that case this might

Re: BTRFS as image store for KVM?

Lionel Bouton writes: > 1/ AFAIK the kernel md RAID1 code behaves the same (last time I checked > you need 2 processes to read from 2 devices at once) and I've never seen > anyone arguing that the current md code is unstable. This indeed seems to be the case on

Re: RAID1 storage server won't boot with one disk missing

Gareth Pye writes: > People tend to be looking at BTRFS for a guarantee that data doesn't > die when hardware does. Defaults that defeat that shouldn't be used. However, data is no more in danger at startup than it is at the moment when btrfs notices a drive dropping, yet

Re: RAID1 storage server won't boot with one disk missing

Goffredo Baroncelli writes: > Hi Anand, > > > On 2015-09-17 17:18, Anand Jain wrote: >> it looks like -o degraded is going to be a very obvious feature, >> I have plans of making it a default feature, and provide -o >> nodegraded feature instead. Thanks for comments if

Re: syntax for deleting subvolumes?

K Richard Pixley rpix...@graphitesystems.com writes: But as a user level facility, I want to be able to snapshot before making a change to a tree full of source code and (re)building it all over again. I may want to keep my new build, but I may want to flush it and return to known good

Re: btrfs send and interrupts

Brendan Hide bren...@swiftspirit.co.za writes: Interesting case. I'm not sure of the merits/workaround needed to do this. It appears even using cat into netcat (nc) causes netcat to quit if you background the operation. Well, that netcat has a bug doesn't mean btrfs-progs should have one as

Re: possible bug in balance

lu...@plaintext.sk writes: Hello, luvar@blackdawn:~$ sudo time btrfs balance start -dconvert=raid1 -dusage=20 /home/luvar/programs/ Am I doing something forbidden (I have not see any structure where raid type is stored per file/subvolume item), or I just hit some problem? What should I

Re: [PATCH 2/2] E2fsprogs: add compress and cow support in chattr, lsattr

Lutz Vieweg l...@5t9.de writes: Maybe chattr +C could print a warning if a file to change attributes for is 0 bytes long? This may only affect btrfs. The old ext2? ext3? compression patches were able to compress pre-existing files. I don't know how other filesystems behave in this regard. --

Re: Balance scrub defrag

Robert White rwh...@pobox.com writes: You need to buy better disks. 8-) Where can one buy these better disks with reasonable prices?-) Disks are best thought of as consumables. I use SMART (smartmontools etc) and its tests to keep track of and warn me of such issues. It's way more likely to

Re: out of space warning?

Robert White rwh...@pobox.com writes: You don't check your car's gas tank every time you put your foot on the brake, you don't want to check your free space every time your system finishes every tiny command you type. Well, actually my car makes a bling every 10 km once it reaches =80 km

Re: Ideas for a feature implementation

Austin S Hemmelgarn ahferro...@gmail.com writes: Another thing that isn't listed there, that I would personally love to see is support for secure file deletion. As discussed in the followups, it is difficult to do a really secure deletion and a security-conscious person would opt to use

Re: Very slow filesystem

Igor M igor...@gmail.com writes: Why btrfs becames EXTREMELY slow after some time (months) of usage ? Have you tried iostat from sysstat to see the number of IO-operations performed per second (tps) on the devices when it is performing badly? If the number is hitting your seek rate (ie.

Re: Very slow filesystem

Erkki Seppala flux-bt...@inside.org writes: If the number is hitting your seek rate (ie. 1/0.0075 for 7.5 ms seek = 133), then fragmentation is sure to be blamed. Actually the number may very well be off by at least a factor of two (I tested that my device did 400 tps when I expected 200

Re: What to do about snapshot-aware defrag

Martin m_bt...@ml1.co.uk writes: The *ONLY* application that I know of that uses atime is Mutt and then *only* for mbox files!... However, users, such as myself :), can be interested in when a certain file has been last accessed. With snapshots I can even get an idea of all the times the file