So after testing LVM Raid
in princple, I have been trying it on some real hardware to see
what happens. The idea was to estimate if it scales and if not,
how it doesn’t. I was expecting to run into all kinds of obscure
problems in my testing, but in fact, it was a quick and short
Where I work, we routinely run our databases on XFS on LVM2.
Exit Strategy by Martha Wells
is the fourth book in the the Murderbot Diaries (All Systems Red,
Exit Strategy, Network Effect).
Fashion and Its Social Agendas: Class, Gender, and Identity in Clothing
by Diane Crane is an analysis of the changes in society during
the various phases of the industrial revolution through the lens
of clothing in various societal strata.
The Wiz Biz by Rick Cook is
a book in the genre of ‘magical realism’. Some real-world person
is being transported into a universe with predictable magic in a
classical fantasy setting and is applying scientic method and
industrial production methods to the setting.
Change Agent is Daniel
Suarez fifth book.
When developing there is often an edit-compile-test cycle, or an
edit-distribute-changes cycle or a similar repetetive task. You
could poll changes, for example with cron every minute or
similarly, but that is wasteful and slow.
is the third and final book in Neal Asher’s
a trilogy set in the Polity Universe.
TL:DR: If you have long running transactions, MySQL does not
deal well with this, and it will slow down the box. That’s
okay as long as you are basically alone on your box, but if you
aren’t, the others will hate you.
I fell into the Twitters again. @CarrickDB joked about Unix,
Files and Directories:
Some of the databases at work are a tad on the large side, in the high
2-digit terabytes of size. Copying these to new machines at the moment takes
a rather long time, multiple days, up to a week. Speeding it up pays
twice, because with shorter copy times there is also less binlog to catch
Water is a very weird substance. Melting ice at 0C to water at
0C takes a fantastic amount of energy: Water has a latent
heat of 384J/gram.
Compared to other materials
that is pretty much at the upper end of the spectrum.
Note to self: Ignoring the Catalina Nagscreens is done like this:
Catalina is here. It fixes many things, among them iTunes. On the other
hand, it drops support for 32-Bit MacOS applications.
Deutsche Welle is shocked:
Generation Greta is watching Netflix
(Article in German Language), Netflix runs on computers, and apparently
computers are using power.
We had a discussion at work about MySQL doing Disk I/O to a NVME
disk, and if it is valid to turn off the doublewrite buffer when
So I have been playing this Internet Spaceships Game.
No, the other one.
It also has NPC Backstory, and on
a multiplanetary food crisis was predicted, as a prep for the introduction
of a new tradeable good on
The last time I saw a MySQL server operating at a performance limit
was in 2012. Back them we had a production master on (then) current
hardware, running stable at about 21000 QPS. At 24000 QPS it tended
to become unstable and fall over, dying in global locks on the
InnoDB Adaptive Hash Index or other global locks.
Ein Thread über Konsenssysteme aus
Saving an older twitter thread on Ceph.