How To Install EPEL Repo on a CentOS and RHEL 7.x

How to install RHEL EPEL repository on Centos 7.x or RHEL 7.x

The following instructions assumes that you are running command as root user on a CentOS/RHEL 7.x system and want to use use Fedora Epel repos.

Method #1: Install Extra Packages for Enterprise Linux repository configuration (recommended)

Just type the following yum command on a CentOS 7 or RHEL 7:

 
sudo yum install epel-release

OR

wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install epel-release-7.noarch.rpm

Top Open Source Storage

If you know of additional open source storage projects that you feel should be on the list, please make note in the comments section below.

NAS/SAN Software

1. Ceph

Ceph describes itself as a "distributed object store and file system designed to provide excellent performance, reliability and scalability." It's built on the Reliable Autonomic Distributed Object Store (RADOS) and allows enterprises to build their own economical storage devices using commodity hardware. Operating System: Linux

2. FreeNAS

The FreeNAS website touts itself as "the most potent and rock-solid open source NAS software," and it counts the United Nations, The Salvation Army, The University of Florida, the Department of Homeland Security, Dr. Phil, Reuters, Michigan State University and Disney among its users. You can use it to turn standard hardware into a BSD-based NAS device, or you can purchase supported, pre-configured TrueNAS appliances based on the same software. Operating System: FreeBSD

3. Gluster

Red Hat-owned Gluster is a distributed file system that can handle big data—up to 72 brontobytes. It promises high availability and performance, an elastic hash algortithm, an elastic volume manager and more. Operating System: Linux

4. Lustre

Now owned by Xyratex, Lustre is a highly-scalable file system that provides fast performance. It can handle "tens of thousands of nodes and petabytes of storage." Note that although the name is similar to "Gluster," the two are completely independent projects. Operating System: Linux

5. NAS4Free

Like FreeNAS, NAS4Free makes it easy to create your own BSD-based storage solution from standard hardware. It promises a low-cost, powerful network storage appliance that users can customize to their own needs. Operating System: FreeBSD

6. Openfiler

Openfiler aims to combine NAS features (NFS, CIFS and HTTP) with SAN features (iSCSI, FC) in a very easy-to-setup storage appliance. It's been downloaded more than a million times, and its users include Motorola, Pratt & Whitney, BillMeLater and the London Metropolitan Police. Paid support is available. Operating System: Linux

7. OpenSMT

Similar to Openfile, OpenSMT can be used to create storage devices with some SAN and some NAS features. It uses the ZFS file system. Operating System: OpenSolaris

8. Open Media Vault

This NAS solution boasts really easy-to-use storage management, fast setup, uninterruptible power supply support and statistics reporting. It's based on Debian Linux and offers a number of plug-ins to extend its capabilities. Operating System: Linux

9. Turnkey Linux

Turnkey offers more than 100 different software appliances based on open source software. Among them is a file server that offers simple network attached storage. Operating System: Linux

10. ZFS

This popular file system is incorporated into many other open source storage projects. It offers excellent scalability and data integrity, and it's available for most Linux distributions. Operating System: Solaris, OpenSolaris, Linux, OS X, FreeBSD

RAID

11. DRBD

DRBD provides high availability for storage by applying RAID-1 to the network. Support and training are available through the project owner, LinBit. Operating System: Linux

12. Mdadm

This piece of the Linux kernel makes it possible to set up and manage your own RAID array using standard hardware. It also provides reporting capabilities. Operating System: Linux

13. Raider

Raider applies RAID 1, 4, 5, 6 or 10 to hard drives. It relies heavily on Linux's mdadm. Operating System: Linux

14. RaidEye

Monitor your OS X-based RAID arrays with this helpful tool. It runs in the background, and if it detects an error or failure, it will send you an email. Operating System: OS X

15. Salamander

This project aims to make it easy for anyone to use RAID on their Linux systems. The website explains the project name by noting, "Salamanders are the only vertebrates that can regenerate limbs. In the same way, a system installed with Salamander can regenerate after a hard-drive failure." Operating System: Linux

16. SnapRAID

SnapRAID backs up disk arrays, primarily those used to store home media collections. It allows recovery even if two separate disks in the array fail. Operating System: Windows, Linux, OS X

Backup and Synchronization

17. AMANDA

The "Advanced Maryland Automatic Network Disk Archiver," a.k.a. AMANDA, backs up networks to tape or hard drives. Paid support and a cloud-based version are available through Zmanda, which is owned by Carbonite. Operating System: Windows, Linux, OS X.

18. Areca Backup

A good option for backing up a single system, Areca aims to be simple and versatile. Key features include compression, encryption, filters and support for delta backup. Operating System: Windows, Linux

19. BackupPC

Designed for enterprise users, BackupPC claims to be "highly configurable and easy to install and maintain." It backs up to disk only (not tape) and offers features that reduce the amount of storage space necessary, as well as the number of I/Os. Operating System: Windows, Linux

20. Bacula

Another enterprise-grade open source back solution, Bacula offers a number of advanced features for backup and recovery, as well as a fairly easy-to-use interface. Commercial support, training and services are available throughBacula Systems. Operating System: Windows, Linux, OS X

21. Clonezilla

Conceived as a replacement for True Image or Norton Ghost, Clonezilla is a disk imaging application that can do system deployments, as well as bare metal backup and recovery. Operating System: Linux

22. Create Synchronicity

Create Synchronicity's claim to fame is its lightweight size—just 220KB. It's also very fast, and it offers an intuitive interface for backing up standalone systems. Operating System: Windows

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Lenovo ThinkPad P50 and P70 mobile workstations kick off brand new product line

Today at the SIGGRAPH 2015 Conference and Exhibition, Lenovo unveiled some new mobile workstations. The new ThinkPad P series are aimed at high-end professionals who need a lot of compute on the go. There are two models, with the P50 being a 15.6-inch version, which is a follow-on to the W541. The larger P70 features a 17.3-inch display. Both can pack some serious specifications under the hood, starting with the processor.

Both models will feature a new processor from Intel, which is going to be the first official mobile version of their Xeon line. Intel has not released much information yet, but the Intel Xeon E3-1500M v5 is going to be powering these workstations from Lenovo. While we don’t have exact frequencies yet, the v5 version is going to be based on the just released Skylake architecture, which brings a lot of new technology to the plate. Lenovo will offer the new P series with up to 64 GB of DDR4 memory, arranged in 4 SODIMM slots. One of the reasons to use Xeon is that it supports ECC memory, and these workstations leverage that for the workloads they will be expected to run Also part of the new Xeon will be Thunderbolt 3, and both models have this connectivity. We're not sure yet if Thunderbolt is built into the Xeons, or if something like the Aipine Ridge as an IO controller for this.

On the GPU side, Lenovo has included a Quadro card, however the exact model is not known yet.

There is also up to 1 TB of PCIe SSD storage available, and up to a 2 TB hard drive. In addition to the Thunderbolt, there will also be HDMI 1.4, mini DisplayPort 1.2, ExpressCard, SDXC, and of course what workstation would not have Gigabit Ethernet, so the P Series has this as well.

Wireless is a new card from Intel as well, with the Intel 8260 card which is an 802.11ac model, and Lenovo will be offering it with Bluetooth 4.1 and vPro as well. For those that need connectivity on the go, Lenovo is offering a Sierra EM7445 LTE-A option as well.

Lenovo P Series Mobile Workstations
	P50	P70
CPU	Intel Xeon E3 1500M v5 Quad-core Skylake ~47W TDP
GPU	NVIDIA Quadro Model number unknown
Memory	Up to 64 GB DDR4-2133 ECC
Storage	Up to 1TB PCIe SSD Up to 2TB HDD
Display	15.6" 1920x1080 IPS w/optional touch Optional 3840x2160 IPS X-Rite Pantone Color Correction	17.3" 1920x1080 IPS w/optional touch Optional 3840x2160 IPS X-Rite Pantone Color Correction
Ports	USB 3.0 x 4 Mini DP 1.2 HDMI 1.4 Thunderbolt 3 Docking Connector Smart Card Reader ExpressCard SDXC Headset
Networking	Intel 8260 Wireless-AC 802.11ac WiFi Bluetooth 4.11 Optional vPro Gigabit Ethernet Sierra EM7445 4G LTE-A
Dimensions	H: 0.96-1.02" (24.5-25.9 mm) W: 14.86" (377.4 mm) D: 9.93" (252.3 mm)	H: 1.17-1.2" (29.9-31.5 mm) W: 16.4" (416 mm) D: 10.8" (275.5 mm)
Weight	Starting at 5.6 lbs (2.5kg)	Starting at 7.6 lbs (3.4 kg)
Battery Life	4 Cell 66 Whr Optional 6 Cell 90 Whr	8 Cell 96 WHr
Price	$1599+	$1999+

Other than the larger display, the P70 can also be had with a DVD-RW drive, but hopefully but the time it launches they will at least offer Blu-ray as an option.

Speaking of the displays, Lenovo has packed some pretty impressive sounding displays into both models. The P series will offer a 1920x1080p as the base, with optional touch, and there is also a UHD 3840x2160 IPS offering as well. All of the panels are IPS models, and Lenovo has turned to X-Rite to offer Pantone color calibration out of the box, and over the lifetime of the device.

The P series can be had with a good choice of operating systems too, from Windows 10 Pro, Windows 8.1 Pro, or downgrade rights to Windows 7 Professional. If you need Linux for your workstation, they will also be offering Ubuntu and RHEL.