Schedule

Schedule

Wednesday, April 1

1427902200 FLOSS Weekly
1427907600 Tech News Today
1427911200 Windows Weekly
1427918400 This Week in Google
1427929200 Tech News 2Night
1427931000 Android App Arena
1427936400 Ham Nation

Thursday, April 2

1427994000 Tech News Today
1427997600 Know How...
1428003000 Marketing Mavericks
1428008400 Home Theater Geeks
1428015600 Tech News 2Night
1428017400 The Giz Wiz

Friday, April 3

1428080400 Tech News Today
1428084000 This Week in Law
1428094800 Before You Buy
1428102000 Tech News 2Night
1428105600 Padre's Corner

Saturday, April 4

1428170400 The Tech Guy

Sunday, April 5

1428256800 The Tech Guy
1428271200 This Week in Tech

Monday, April 6

1428339600 Tech News Today
1428343200 Triangulation
1428348600 iPad Today
1428355800 Coding 101
1428361200 Tech News 2Night

Tuesday, April 7

1428426000 Tech News Today
1428429600 MacBreak Weekly
1428438600 Security Now
1428447600 Tech News 2Night
1428451200 All About Android

Wednesday, April 8

1428507000 FLOSS Weekly
1428512400 Tech News Today
1428516000 Windows Weekly
1428523200 This Week in Google
1428534000 Tech News 2Night
1428535800 Android App Arena
1428541200 Ham Nation

Thursday, April 9

1428598800 Tech News Today
1428602400 Know How...
1428607800 Marketing Mavericks
1428613200 Home Theater Geeks
1428620400 Tech News 2Night
1428622200 The Giz Wiz

Friday, April 10

1428685200 Tech News Today
1428688800 This Week in Law
1428699600 Before You Buy
1428706800 Tech News 2Night
1428710400 Padre's Corner

Most Recent Episodes

All About Android

Samsung Galaxy S6, The Chrome Stick, and Android Apps on Chrome OS!

Tech News 2Night

Microsoft Surface 3 can run Windows 10.

Security Now

Is it possible to replace a crashed hard drive when UEFI secure boot is on?

MacBreak Weekly
Episode #448: Normcore March 31st, 2015

How Tidal will affect Apple's Beats.

Tech News Today

IBM invests in the Internet of Things.

Tech News 2Night

Windows Spartan sneak peak

Coding 101
Episode #61: Carlos Souza March 30th, 2015

Learn ruby from codeschool.com and Carlos Souza

iPad Today

Tumblr, Instapaper, Crazy Gears

Triangulation
Episode #194: Meerkat March 30th, 2015

Meerkat founder Ben Rubin talks about the live-streaming mobile app.

Tech News Today

Apple Watch Edition purchasing process details emerge.

Know How... 78

FreeNAS

January 30 2014

Got a few old computers lying around? Want an enterprise-level storage box? Expert guest Patrick Norton shows us how to create a FreeNAS using old system parts.

Feedback!

Thanks for our listeners who participate in the KH Community!

Featured Users

Mike Marien wanted to know if we should use the same SSID on multiple APs.

Warren Blesofsky was wondering if "Windows Defender" is the only malware defense he should run on his Windows PC.

Vivek Dhutia has a great "Solar Pi" server that he NEEDS to send a picture of.

Neil Tsubota asked about the practical reasons for using static IP addresses.

Lee Roche is thinking about making an advanced test bench.

** If you plan to reuse an old ATX Power Supply, connect pins 14 & 15.

RAID

Here's a bunch of RAID stuff from Wikipedia.

RAID 0 comprises striping (but no parity or mirroring). This level provides no data redundancy nor fault tolerance, but improves performance through parallelism of read and write operations across multiple drives. RAID 0 has no error detection mechanism, so the failure of one disk causes the loss of all data on the array.

RAID 1 comprises mirroring (without parity or striping). Data are written identically to two (or more) drives, thereby producing a "mirrored set". The read request is serviced by any of the drives containing the requested data. This can improve performance if data is read from the disk with the least seek latency and rotational latency. Conversely, write performance can be degraded because all drives must be updated; thus the write performance is determined by the slowest drive. The array continues to operate as long as at least one drive is functioning.

RAID 2 comprises bit-level striping with dedicated Hamming-code parity. All disk spindle rotation is synchronized and data is striped such that each sequential bit is on a different drive. Hamming-code parity is calculated across corresponding bits and stored on at least one parity drive. This level is of historical significance only. Although it was used on some early machines (e.g. the Thinking Machines CM-2), it is not used by any current commercially available systems.

RAID 3 comprises byte-level striping with dedicated parity. All disk spindle rotation is synchronized and data is striped such that each sequential byte is on a different drive. Parity is calculated across corresponding bytes and stored on a dedicated parity drive. Although implementations exist, RAID 3 is not commonly used in practice.

RAID 4 comprises block-level striping with dedicated parity.

RAID 5 comprises block-level striping with distributed parity. Unlike in RAID 4, parity information is distributed among the drives. It requires that all drives but one be present to operate. Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost. RAID 5 requires at least three disks.

RAID 6 comprises block-level striping with double distributed parity. Double parity provides fault tolerance up to two failed drives. This makes larger RAID groups more practical, especially for high-availability systems, as large-capacity drives take longer to restore. As with RAID 5, a single drive failure results in reduced performance of the entire array until the failed drive has been replaced.

FreeNAS

Network Attached Storage products have become more commonplace as users demand access to their data on all their network-connected devices. FreeNAS is a FreeBSD-based operating system that installs in 2GB of space and can turn your old hardware into an enterprise-level storage box.

What you'll need

  • Computer: You want the fastest processor you can salvage, a motherboard that supports AT LEAST 4GB of memory and has multiple SATA ports, a case with many drive bays, and a 300W and Power Supply.
  • DRIVES!: You can use any drives you've got running around while you're learning FreeNAS, but when you decide to build a FreeNAS box that will serve as your permanent storage you should consider using either the WD GREEN or WD RED series of drives. They run cooler, quieter and use less power.
  • PCI SATA card (Optional)
  • Flash Drive: 4GB
  • Monitor + Keyboard
  • Blank CD
  • USB CD-ROM drive
  • A second network-connected computer that can be used to configure the FreeNAS box

What you'll do

  1. Download the latest FreeNAS disto and burn it to CD-ROM
  2. Open the computer and strip out the hard drives and optical drives. You want to save all the drive bays and SATA ports for the array drives.
  3. Plug the Flash drive into a USB port
  4. Connect all your drives to the motherboard. You MAY need additional SATA power breakout cables. You may also need a PCI SATA board if you want to install more drives in the case than the motherboard supports.
  5. Connect the monitor and keyboard to the computer, the connect the computer to your network.
  6. Power up the PC: Load the CD into your USB optical drive and make sure it's set to boot from that optical drive
  7. Install FreeNAS on the USB Key
  8. Log into the FreeNAS box. (The IP address will show up on the screen connected to the FreeNAS box.)

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