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Showing entries 1 to 10 of 69 10 Older Entries

Displaying posts with tag: Hardware (reset)

How to improve InnoDB performance by 55% for write-bound loads
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During April’s Percona Live MySQL Conference and Expo 2014, I attended a talk on MySQL 5.7 performance an scalability given by Dimitri Kravtchuk, the Oracle MySQL benchmark specialist. He mentioned at some point that the InnoDB double write buffer was a real performance killer. For the ones that don’t know what the innodb double write buffer is, it is a disk buffer were pages are written before being written to the actual data file. Upon restart, pages in the double write buffer are rewritten to their …

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GUUG Frühjahrsfachgespräch 2014: CfP ends on May 31st!
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The German Unix User Group (GUUG) will hold their annual conference "Frühjahrsfachgespräch" on September 23-26 this year (I know, not really "Frühjahr" anymore, but this is how it is).

The Call for Presentations is still open until May 31st. Talks can be proposed in German and English, and there are slots for longer tutorials as well.

The range of possible topics is broad, so if you think you have anything interesting to share with a very passionate and technical audience of …

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Linus on Instantiation and Armadaification
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I feel a sense of pride when I think that I was involved in the development and maintenance of what was probably the first piece of software accepted into Debian which then had and still has direct up-stream support from Microsoft. The world is a better place for having Microsoft in it. The first operating system I ever ran on an 08086-based CPU was MS-DOS 2.x. I remember how thrilled I was when we got to see how my friend’s 80286 system ran BBS software that would cause a modem to dial a local system and display the application as if it were running on a …

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A Few Thoughts on OSCon and the Open Source Community
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This past week I attended OSCon, the annual conference for open source’s true believers. And there was a religious fervor in the air, particularly from the point of view of someone more accustomed to Oracle conferences.

And if open source is the religion, proprietary closed-source companies are the devil. That having been said, I was surprised how virtually all large companies were demonized. Even long-time defenders of open source like IBM were ignored at best. That didn’t prevent them from coming though, with Microsoft and HP in particular with high-profile sponsorships and PR …

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Hardware Components Failures – Survey Results
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When preparing for the the IOUG Collaborate 12 deep dive on deploying Oracle Databases for high Availability, I wanted to provide some feedback on what hardware components are failing most frequently and which ones are less frequently. I believe I have reasonably good idea about that but I thought that providing some more objective data would be better. I couldn’t find and results of a more scientific research so I decided to organize a poll. This blog post shows the results and I …

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Should RAID 5 be used in a MySQL server?
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Usually the answer should be “no!”. RAID level 5 is hardly ever a good choice for any database storage. It comes with a very high overhead as each write turns into a sequence of four physical I/O operations, two reads and two writes, in order not only to update a data block, but also to re-calculate and update the corresponding checksum block. The resulting penalty is not just slower writes. The extra operations mean the storage I/O capacity is reduced too.

Another disadvantage of using RAID 5 could be its very poor performance when it works in degraded mode. In such configuration a disk failure means some data was actually …

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Relearn about your battery
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Some days ago I got a call from our support engineer on duty that MySQL on one of our database servers was lagging more than 1000 seconds behind in replication and the server got kicked out of the pool because of the delay. He was unable to find out why and there was absolutely nothing in the mysql log files. When I got the call it was still lagging behind but the lag was slowly decreasing again.

After a quick peek in all our monitoring systems I isolated it to this message:
Cache Battery 0 in controller 0 is Charging (Ready) [probably harmless]
Apparently not that harmless! :P

Obviously we did encountered this …



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Got open source cloud storage? Red Hat buys Gluster
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Red Hat’s $136m acquisition of open source storage vendor Gluster marks Red Hat’s biggest buy since JBoss and starts the fourth quarter with a very intersting deal. The acquisition is definitely good for Red Hat since it bolsters its Cloud Forms IaaS and OpenShift PaaS technology and strategy with storage, which is often the starting point for enterprise and service provider cloud computing deployments. The acquisition also gives Red Hat another weapon in its fight against VMware, Microsoft and others, including OpenStack, of which Gluster is a member (more on that further …

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CodeBits - An event of competitive innovation
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It was my pleasure and privilege to attend Codebits in 2009. As Roland Bouman says, its talk choice method is based on public voting, and therefore everyone cha have contribute to the schedule.But that is not the main reason for attending this extraordinary event. It is not just a conference. It's an innovation fest. For 1 and 1/2 days, it's a conference, where the speakers are encouraged to bring to their audience the most …

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Aligning IO on a hard disk RAID – the Benchmarks
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In the first part of this article I have showed how I align IO, now I want to share results of the benchmark that I have been running to see how much benefit can we get from a proper IO alignment on a 4-disk RAID1+0 with 64k stripe element. I haven’t been running any benchmarks in a while so be careful with my results and forgiving to my mistakes

The environment

Here is the summary of the system I have been running …

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Showing entries 1 to 10 of 69 10 Older Entries

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