blog

Elevator Algorithm

Marcelo Leal — Sun, 05 Sep 2010 02:25:07 +0000

Hello there, this will be a long post… so, i think if you have no time to waste, think again before you go ahead. And, no. I’m not Morpheus, so i cannot offer you the truth. Actually, i can just offer you my doubts. And no pills, i do not like them. My blog is [...]

Performance II

Marcelo Leal — Tue, 31 Aug 2010 22:39:02 +0000

In my last post about “Performance“, i did talk about a ZFS tuning parameter: zfs_prefetch_disable. And that was a ZFS read parameter… In this post, we will take a look in another one, with the same “water to wine” effect. This time with focus on writes… We have a set of informations available for our [...]

Ganglia on OpenSolaris

Marcelo Leal — Wed, 25 Aug 2010 15:40:20 +0000

As system administrators we need to have some essential info about our servers as a minimum requirement for our job, and identify patterns and obtain knowledge about trends in our workload. And, when we need to use Dtrace, MDB, or need to understand a FMA ereport… we do not have much time. Actually, i want [...]

América vermelha novamente!!!

Marcelo Leal — Thu, 19 Aug 2010 04:22:06 +0000

Olha o Leonardo Bi-Campeão da América!!! Melhores momentos da conquista colorada: Quer relembrar o primeiro título da Libertadores da América que o Colorado conquistou?

PS3 (KEM-410 ACA)

Marcelo Leal — Sun, 15 Aug 2010 15:14:21 +0000

The kids are happy again… after a few days without playing FIFA, GOW III, or GTAIV, now the PS3 it’s working, finally. But that was a long story that i will make it short to maybe help others with the same problem. Seems to be a pretty normal scenario for the first PS3 models, the [...]

Arithmetic exception

Marcelo Leal — Thu, 12 Aug 2010 19:03:02 +0000

Ok, if you are a noob C programmer, you will find this post really fun, serious, it will make you LOL. If you are a noob, really noob “XYZ” programmer, maybe you find it helpfull… maybe… no. You will LOL too… So, one more time we have a core file sitting around on our servers. [...]

Senna

Marcelo Leal — Sat, 07 Aug 2010 20:03:58 +0000

How did i miss this video? Fantastic! I need to put it here…

Classificado!!!

Marcelo Leal — Fri, 06 Aug 2010 03:03:36 +0000

Melhores momentos da partida:

Music? They are fast…

Marcelo Leal — Wed, 14 Jul 2010 20:40:00 +0000

Do you need L2ARC redundancy? I do…

Marcelo Leal — Tue, 06 Jul 2010 20:41:53 +0000

Hello there… I think you agree that the storage’s problem is the READ requests, synchronous by nature. And, as i said many times before, i think the solution for all problems (the answer for all questions ;-) is cache. Many levels, many flavors. I did read many times about the recommended redundancy on the ZFS [...]