HD Doctor Blog

Striped set with dual distributed parity. Provides fault tolerance from two drive failures; array continues to operate with up to two failed drives. This makes larger RAID groups more practical, especially for high availability systems. This becomes increasingly important because large capacity drives lengthen the time needed to recover from the failure of a single drive. Single parity RAID levels are vulnerable to data loss until the failed drive is rebuilt: the larger the drive, the longer the rebuild will take. Dual parity gives time to rebuild the array without the data being at risk if a (single) additional drive…

One of the trends in personal computing these days is the prevelance of more options for hard disks and RAID systems than have been available in the past. As a result, many people want to move towards one of these systems as an upgrade, but at the same time want to avoid the hassle of reinstalling Windows and all applications. This has been exceedingly difficult and in some cases even impossible do to. However, with this guide, you’ll be able to perform this task in most cases with most hardware configurations.

What You Can and Cannot Do With This Guide…

1. Stellar Phoenix Macintosh Data Recovery Software

Company: Stellar Data Recovery
Supported Mac Type: HFS, HFS+, HFSX, HFS Wrapper and FAT file system volumes
Price: $ 129.00 – $ 349.00

FAT file system support.
Updated Audio & Video preview support (using Qt’s class).
Save Scan Information of Lost Volume list.
Check Destination (not scanned drive) during create image, save scan and saving of files.
Check free space of destination during saving of files/ create image.
Not saving empty folder when filter is applied.
Updated KDC and CRW file…

Windows is generally perceived as being easier to use and administer and mostly with good reason. Most companies choose Windows as their desktop environment and often for their intranet servers too. And yet some companies selected Linux as the desktop and server platform for their massive infrastructure upgrade. In the following paragraphs I will explain the rationale for the decision.

As Sever Machines: Linux VS Windows

For Example: we have embarked on a massive upgrade of our infrastructure with the addition of several 24/7 servers with RAID 1, QA automation machines, order processing machine and redundant internet connections. Each server…

Information technology is at the core of almost every organization today. The computer data is one of the invaluable assets for a company. Any computer related disaster can result in irreversible losses for the company. To avoid such disasters out of the blue most companies have a disaster recovery planning as a part of a business continuity planning. To over this important for every organization, you should plan a disaster recovery using with the help of disaster recovery tool. Disaster recovery tools are essentially a part of Disaster Recovery Planning (DRP). The DRP documents chalk out the plan of action…

RAID stands for Redundant Array of Inexpensive Disks which is a technology that employs the simultaneous use of two or more hard disk drives to achieve greater levels of performance, reliability, and/or larger data volume sizes.

There are different levels of RAID. The most popular RAID formats are RAID-1 & RAID-5. However today we will not focus on the various RAID format. Let’s go straight to the differences between software RAID and hardware RAID.

1. Hardware RAID:

• A conventional Hardware RAID consists of a RAID controller that is installed into the PC or server, and the array

…

Seagate are presently among the most popular and reliable hard disks drives. The disks of the Barracuda ATA 4, ATA 5 and SATA series are relatively fast and advanced models, the only major drawback of which is their considerable heating during operation. Most frequently repairs are called for because of damaged controller components or stuck spindle motors. Disks from the U series also suffer from reading problems due to erratic development of unstable regions on the disk surface which are impossible to eliminate in any conventional way. Data recovery from Seagate HDD’s is a labor consuming process, especially…

The basic idea of RAID (Redundant Arrays of Inexpensive Disks) is to combine multiple small, independent disk drives into an array of disk drives which yields performance and recoverability exceeding that of a Single Large Expensive Drive (SLED). Redundancy is also provided (unless RAID 0) which allows easy and often automatic recovery from hard disk crash. With the reduction in price of ATA and SATA drives it is often a good idea, even for desktop computers, to setup a RAID 1 system to allow you to function in the event of hard disk failures. In RAID 1 two hard disks…

-profile
-System wide environment and startup script program.

/dev/MAKEDEV
The /dev/MAKEDEV file is a script written by the system administrator that creates local only device files or links such as device files for a non-standard device driver.

/etc/aliases
Where the user’s name is matched to a nickname for e-mail.

/etc/bootptab
The configuration for the BOOTP server daemon.

/etc/crontab
Lists commands and times to run them for the cron deamon.

/etc/dhcpd.conf
The configuration file for the DHCP server daemon.

/etc/ethers
File for RARP mapping from hardware addresses to IP addresses. See the man page ethers(5).

/etc/exports
The file describing exported filesystems…

Linux file structure files are grouped according to purpose. Ex: commands, data files, documentation. Parts of a Unix directory tree are listed below. All directories are grouped under the root entry “/”.

root – The home directory for the root user
home - Contains the user’s home directories along with directories for services

• ftp
• HTTP
• samba
• george

bin – Commands needed during bootup that might be needed by normal users
sbin – Like bin but commands are not intended for normal users. Commands run by LINUX.
proc – This filesystem is not on a disk.…