raid 1

Once the new partition is visible to the system, we're ready to restore our degraded RAID-1 array -- then, we'll have some redundancy again.

If you're have the ability to set up a RAID-1 volume on a test machine and follow along with me, I highly recommend that you do so.

Our RAID-1 volume would be running in degraded mode, meaning that our volume is still available but without any redundancy.

This is because RAID 1 keeps every bit of data replicated on each of its devices in the exactly same fashion, create identical clones.

After going through the simulation, you'll have all the experience you need to handle a RAID-1 failure in a real-world environment.

Then, open it up and unplug one of the hard disks that make up your RAID-1 array.

Our RAID-1 volume would still be running in degraded mode at this point.

In the second half of the article, Daniel walks you through the simulation of a RAID-1 failed drive replacement.

OK, our first step is to set up a RAID-1 volume; refer to my previous article if you need a refresher on how to do this.

What does the May 1 raid on the Abbottabad compound say about Pakistan's role and the future of its ties with the United States?

RAID-1 is simple, but it's wasteful in terms of capacity utilization.

Ideally, the page file should have its own disk and the transaction log should have its own RAID 1 disk set.

For instance, RAID 0 1 is a nested set of striped devices in a mirror configuration.

The hall, which could seat 1, 000 people on wooden benches, was damaged in a Kuomintang air raid and has since been rebuilt.

With RAID-1, a disk can fail, and information can still be acquired through the other copy.

On a side note, in mathematical terms, RAID 1 is an AND function, whereas RAID 0 is an OR.

RAID-1 is the most reliable of the three RAID arrays because all data is mirrored as it is written.

Use Raid-1 for the transaction log file volumes, SMTP queues, and MTA queues.

Although this may seem inefficient, RAID-1 is the preferred choice for data that requires the highest possible reliability.

RAID-1 is a mirrored disk array in which two disks are mirrored.

OK, now that we know what RAID is and how it works, let's configure one - or two!

In this article, we look at what you need to know in order to use RAID-1 to increase availability in a production environment.

Figure 1 provides a graphical summary of these RAID-0 and RAID-1 schemes.

All page spaces should either be mirrored or on a raided (1 or 5) storage area network (SAN).

WD RAID Manager is also the tool you'll use to switch between RAID modes 0 and 1 (doing so erases all data on both drives, however).

Enhanced RAID 1 is generally recommended for data disks.

Table 1 compares several aspects of an HDD RAID group to an EFD RAID group.

Practical example: 2 disks, each 80GB in size can be used in a 80GB RAID 1 configuration.

RAID 5 offers lower performance, compared to RAID 0 or RAID 1, but greater reliability and faster recovery.

Vinum implements virtual disk drive management and can cope with RAID 0, RAID 1, and RAID 5.

Hardware-based solutions are typically implemented by using RAID (redundant array of independent disks) levels 0, 1, 3, and 5.

On May 30, 1942, the Royal Air Force launched its first 1, 000-bomber raid on a German city, Cologne.

level=raid1 defines the RAID level; in our case, RAID 1 (Mirror).

RAID-1 is the least expensive because it requires only two 45-GB drives to store 90 GB of data.

RAID configuration testing was limited to RAID 0 and 1 for workstation solutions and RAID 0, 1, and 5 for server solutions.

The RAID Controller SRCSAS18E supports RAID 0, 1, 5, 10, and 50 and enclosure management using SAF-TE and SES2 protocols.