Schedule

Schedule

Saturday, April 18

1429380000 The Tech Guy

Sunday, April 19

1429466400 The Tech Guy
1429480800 This Week in Tech

Monday, April 20

1429549200 Tech News Today
1429552800 Triangulation
1429558200 iPad Today
1429565400 Coding 101
1429570800 Tech News 2Night

Tuesday, April 21

1429635600 Tech News Today
1429639200 MacBreak Weekly
1429648200 Security Now
1429657200 Tech News 2Night
1429660800 All About Android

Wednesday, April 22

1429716600 FLOSS Weekly
1429722000 Tech News Today
1429725600 Windows Weekly
1429732800 This Week in Google
1429743600 Tech News 2Night
1429745400 Android App Arena
1429750800 Ham Nation

Thursday, April 23

1429808400 Tech News Today
1429812000 Know How...
1429817400 Marketing Mavericks
1429822800 Home Theater Geeks
1429830000 Tech News 2Night
1429831800 The Giz Wiz

Friday, April 24

1429894800 Tech News Today
1429898400 This Week in Law
1429909200 Before You Buy
1429916400 Tech News 2Night

Saturday, April 25

1429984800 The Tech Guy

Sunday, April 26

1430071200 The Tech Guy
1430085600 This Week in Tech

Monday, April 27

1430154000 Tech News Today
1430157600 Triangulation
1430163000 iPad Today
1430170200 Coding 101
1430175600 Tech News 2Night

Most Recent Episodes

Before You Buy

First looks at the 3DR Solo Drone and Sony HDR 4K Monitors at NAB.

This Week in Enterprise Tech

AT&T suing the FCC, Skype for Business, and Android is ready for work.

Tech News 2Night

What's so great about Slack?

This Week in Law

Co-founder of Invisible Girlfriend Matt Homann and crowd-sourced labor.

Tech News Today

Google now shows Apps in search results, on Android devices.

This Week in Computer Hardware

Intel Skylake Leaks!

The Giz Wiz

Onewheel, ThinkPad Stacks, Epson HD Whiteboard, and more.

Tech News 2Night

The best apps for your messy digital life

Home Theater Geeks
Episode #252: NAB 2015 April 16th, 2015

The latest and greatest from NAB 2015

Marketing Mavericks

How to make your app sticky.

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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