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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for December 20th, 2014

Delphi Cookbook for USD 5 (or EUR 4.80); actually: get any Packt eBook or video for that price – #packt5dollar

Posted by jpluimers on 2014/12/20

Earlie this month, I wrote a review about Delphi Cookbook.

Well: as of last thursday, you can get that for USD 5 (or EUR 4.80, so better get yourself a USA account: just ensure your address is in the USA).

Heck: until januari 6th, you can get any eBook or Video on Packt for USD 5.

Note there is even an x-Mas countdown on the way (with each day a free book that is readable/downloadable for 24 hours).

There’s over 2500+ books to choose from, so I’m grabbing this chance to learn a few things on OpenCV, Scala, and PowerShell.

–jeroen

via: Book review: Delphi Cookbook by Daniele Teti, Packt publishing.

Posted in .NET, CommandLine, Delphi, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Development, Java Platform, PowerShell, Scala, Scripting, Software Development | Tagged: , | Leave a Comment »

My ZFS question on G+: investigation for using a XW6600 based system with ZFS.

Posted by jpluimers on 2014/12/20

My ZFS question on G+:

Hi everyone. I’m a geek. Learned most of the stuff by doing, and keeping tracks of what I did on my tech-blog http://wiert.me

I want to start with ZFS on a pair of HP XW6600 machines having 32gigabyte of RAM.
Any help on that is much appreciated.

The idea is to have one of these here in a closet and the other remotely, and perform replication between them (I’ve a 50megabit fiber-to-the-home uplink which can grow to 100megabit plus, internally my network is gigabit).

My current data is on a Windows 2003 x64 server with dual RAID5 configurations that are synced every night (not optimal for various reasons) with about 12gigabyte of files having mostly read-only access patterns and these kinds of sizes:
– small files between 4kilobyte and a few megabytes
– photos between 5 and 20 megabytes
– ISO backups and 7zip archives of projects (operating system installers, etc) between 100megabytes-6gigabytes
plus an ESXi machine having about 4gigabyte of data (mostly sizes between 20 and 200 gigabyte).

New storage should initially be at least 16gigabyte with room for growth.

I’m having active experience with OpenSuSE, ESXi and Windows. Solaris experience is from a long time ago. Learning by doing is my way of quickly gaining knowledge.

My schedule is doing research until the end of January (partially overlapping with a holiday) then building and testing until the end of Q1, going live early Q2.

Current plan is to put a lot of Samsung M9T 2terabyte SATA drives (they are only 9.5millimeter high) into the XW6600 rigs.
Earlier this year I did some research on controllers and hard drives, and I wonder how much of it is still current: https://wiert.me/2014/03/12/lots-of-2-5-3-5-and-5-25-conversion-brackets-and-hot-swap-bays/
(A quick calculation shows I should be able to get at least 14 externally accessible M9T drives into this machine, plus room for internal SSDs, etc).

So: where should I get started?

Initial questions I have:
– how about rebuild time when drives are lost? (how does the process of cold/hot spares work, can this be automated, how fast is it?)
– I’m not happy about the RAID5 rebuild times, so are 2TB drives indeed the sizes to go for?
– how about configuring things like ZFS equivalents of stripe size, buffer sizes, etc?
– what SATA controllers to use (is mainboard OK, what in addition to the mainboard SATA?)
– how can ZFS be used as an iSCSI target? how well does that work? (That would be really nice to connect to it from ESXi, Windows and many Linuxes/Linii)
– what about compression and block-deduplication?
– what about ZIP and L2ARC? how to estimate their size?
– which ZFS implementation to use? ZoL? OpenSolaris? Nexenta? Others?
– can a ZFS volume grow by adding extra drives?
(14 drives would get ~20terrabyte based on Z-3: http://www.servethehome.com/raid-calculator/ or http://wintelguy.com/raidcalc.pl but I want to have room for growth)

–jeroen

via: Hi everyone. I’m a geek. Learned most of the stuff by doing, and keeping tracks….

Posted in *nix, Hardware, HP XW6600, Linux, openSuSE, Power User, SuSE Linux, ZFS | 2 Comments »

 
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