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Comment: well.. (Score 1) 362

by Mirar (#47887801) Attached to: The State of ZFS On Linux

I tried to run backups to ZFS on a crypted USB disk. It worked for a while, but if something fails (like the backup disk going to sleep), the entire chain hangs. I can't disconnect the crypt device, and I can't disconnect the ZFS pool, zpool and zfs hangs. What I do with the USB cable and hardware no longer has any impact. I stopped doing that. (I didn't have better luck with btrfs.) Although I don't really blame ZFS that much other than it can't handle hanged devices. USB on Linux is still flaky.

The other problem I have is that it after a while happily uses up 30GB of my 32GB on the computer, and extremely reluctantly gives them away again. I can't seem to be able to control how much ZFS will use. And the rest of the system isn't really happy with just 2GB to run programs in (several virtual machines of 8GB RAM each, for instance).

Comment: Re:Unfamiliar (Score 1) 362

by Mirar (#47887779) Attached to: The State of ZFS On Linux

The big difference from raid+filesystem to zfs or brtfs is that the new ones have a checksum on the raid blocks.
That means that if you get bit errors (or more than bit errors) on one of the blocks on the raid, you can rebuild that block from the others.

WIth a normal RAID there is no way of telling which bit is wrong, just that the blocks don't match up anymore. You're protected against one disk failing, but not the random errors.

You can also add deduplication, compression and snapshots if you want. Don't know how LVM+raid works with that.

Comment: so 1h every 10 day per citizen (Score 1) 338

by Mirar (#47735515) Attached to: New EU Rules Will Limit Vacuum Cleaners To 1600W

Denmark uses about 34TWh/year. EU has about 500M citizen. A vacuum cleaner is using about 2kW.
That gives about 30 vacuum-hours per year per citizen, or about 1h per 10 days (rounding in different directions).

Seems remarkably reasonable.

I don't understand the meddling of capping the power though. Just make sure everything needs to be marked with how much !/W you get from the items. I'm sure most consumers are interested in the actual work performed by the vacuum, not how much you put in. But the sellers are of course interested in hiding it.

(. Soon they will cap your hifi at 40W and tapwater taps at 1dl/minute. .)

Comment: Re:What are you running? (Score 1) 171

by Mirar (#47570383) Attached to: Quiet Cooling With a Copper Foam Heatsink

My heatsink losened from my laptop (MSI GT683R, i7-2630QM?), one of the nuts that was supposed to be soldered to the board stopped being soldered to the board. I couldn't figure out why it was throttling.

  It was throttling at 95C and hit temperatures up to 102C.

Gaming on it gave a full framerate for 10-15 seconds, then no frames for about 5 seconds, repeat. Still runs fine now after resoldering the nut to the board. And it never turned off, just throttled down to 200MHz or so and cooled down.

(If I remember correct my P4 happily ran at 85C too. But I might misremember. After that my stationaries have been watercooled and it's hard to get them over 55C.)

Comment: Re:I am skeptical (Score 1) 171

by Mirar (#47570311) Attached to: Quiet Cooling With a Copper Foam Heatsink

But with the foam you would use a lot less copper, at least. It'll be cheaper (if it has the same production cost). Not sure how to produce metal foam, though?

Foam has another drawback: Isn't it tricky to transport the heat all the way to the actual airflow, given the thin filaments and probably longer distances?

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