Disqus - Latest Comments for madssj

Re: 71 TiB DIY NAS based on ZFS on Linux

madssj — Wed, 03 Sep 2014 04:52:54 -0000

I'm just saying, that there's a huge difference between the two. As we've already covered in another comment, the difference between using and not using the buffer cache on a 16 GB memory system, with a 1 TiB file will be negligible.

conv=sync won't affect the speed of what you're writing, but the output of what you're writing.

For any size file that'll fit into the buffer cache, the results will the difference between writing to memory and writing to disk.

Re: 71 TiB DIY NAS based on ZFS on Linux

madssj — Wed, 03 Sep 2014 04:29:51 -0000

Agreed.

Re: 71 TiB DIY NAS based on ZFS on Linux

madssj — Wed, 03 Sep 2014 03:26:37 -0000

The results would be ~1.5% wrong without it.

Re: 71 TiB DIY NAS based on ZFS on Linux

madssj — Tue, 02 Sep 2014 04:51:24 -0000

I'm actually using ZoL/Debian on another system, and it's been running very smoothly.

As for testing with dd, there's a huge difference between conv=sync, and conv=fsync. One pads the input, the other calls fsync to sync data and metadata to disk before exiting.

Re: 71 TiB DIY NAS based on ZFS on Linux

madssj — Mon, 01 Sep 2014 10:45:05 -0000

ZoL is *the* way to add ZFS to any Linux distribution.

Re: 71 TiB DIY NAS based on ZFS on Linux

madssj — Mon, 01 Sep 2014 07:15:33 -0000

I did a build based on the same chase, hba's and motherboard a year ago. It's running FreeBSD and with the hba's cross flashed to IT mode. It's been running very stable, although there's been a few disk casualties.

A few notes:

Remember to add conv=fsync to your dd run, otherwise you'll end up testing the speed of your buffer cache.

With that many disks in your pools, you'd probably want to use uuid-based assignment (/dev/disk/by-uuid) over location based (/dev/sdX).

Re: Extracting a single database from a pg_dumpall PostgreSQL dump

madssj — Mon, 16 Dec 2013 05:22:14 -0000

It worked wonderfully in 2010, the dump format might have changed. I'll add a link in the top for your updated gist - thanks!

Re: Extracting a single database from a pg_dumpall PostgreSQL dump

madssj — Tue, 04 Jun 2013 04:23:42 -0000

Then it can't find a line that says "\connect dbname" in your dump file.

Feel free to tinker with the script.

Re: And a fun weekend was had by all...

madssj — Mon, 01 Mar 2010 16:08:34 -0000

> 5 new instances to run memcached. This allowed us to expand the size of the memcache in front of memcachedb to 6GB (up from 2GB).

Wait, what. Are you using m1.small instances for your caches or did you actually gain a couple of hundred megabytes of memory from those 5 instances, and from that were able to use 6GB to stick in front of memcachedb?

Re: Securing an HTTPS server

madssj — Wed, 30 Sep 2009 03:28:44 -0000

Remind me to get you a tinfoil hat that says "Thank you".

Re: Tarsnap mailing lists

madssj — Tue, 21 Jul 2009 10:22:51 -0000

Oh, I've been looking forward to this day!

Thanks a bunch Colin.

Re: A call for schwag

madssj — Wed, 15 Jul 2009 05:11:31 -0000

Not to say that this is not a good idea, but it kind of raises the question about who to send stuff or money.

For example, I use Debian a lot, now say I want to thank someone for that. Who sould I thank? I could thank Linus for writing Linux in the first place, or Allan Cox for contributing a whole lot of code to Linux and the community as a whole, or I could thank some random Debian developer. The project itself could probably also use some money (don't know about Debian actually, but FreeBSD has the FreeBSD Foundation - Debian probably has something similar).

Perhaps this would be easier if the larger OSS projects had some kind of "show your appriciation" page with wishlists and such. Spending an hour to track down some random guy will make a lot of people not do it.

Now, I'm off to find the author of ionice and the author of the kernel code that makes it possible for ionice to work in Linux.

Thanks for the enlightment.

Also:

Dear Mr. Developer Colin.

Thanks for all your work on FreeBSD - if you ever find yourself in Copenhagen, I'll happliy supply you with beer and a fistfull of stickers that say "Konstellation".

Cheers.

Re: bitquabit - Zombie Operating Systems and ASP.NET MVC

madssj — Fri, 12 Jun 2009 19:54:34 -0000

Two words. Backwards compatibility.