Mac os x raid types

• Important points to know about SoftRAID volumes;
• Create a disk set using Disk Utility on Mac.
• How to set up a RAID in macOS Sierra’s Disk Utility!
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• Creating a RAID in OS X 10.11;

JBOD will let you use each drive in a multi-bay disk array independently, while a RAID will utilize some or all of the drives simultaneously, depending on how it is formatted, and provides performance, data redundancy, or a combination of both. For example, a RAID 0 provides data striping, which combines all the individual drives into one big one.

Data is read from and written to all disks at once, which provides a solid boost in performance, but provides no data redundancy. If one drive dies in RAID 0, you lose everything. RAID 1 provides the best data redundancy at the cost of performance by using half the array's drive bays for storage and the other half for backup. For example, in a four bay array, two of the drive bays would be used for data storage, while the other two drives are used to keep a 1: Moving up to RAID 5, this provides a combination of performance and redundancy.

RAID 5 reads and writes data using multiple drives simultaneously, yet keeps one drive reserved for redundancy in the case of a drive failure, so you can suffer one drive failure in RAID 5 and still be ok So, if you have a four bay RAID 5 array, you would lose one drive for data redundancy, leaving you with three available drives for storage. I hope this helps.

Which RAID?

I think the article should explain things pretty well from here, but feel free to write back if you have more questions. I really appreciate you answer. I had read that my setup would provide 2TB and to my surprise it does. Remember that in RAID 5, you always lose one drive for data redundancy, and that the minimum number of required drives is three. Don't forget that formatting the drives uses a bit of space, so you'll likely be left with a bit less than 2TB, but it shouldn't less than 1. Allowing for redundany and parity file, this permits less than 0.

Of course this oversimplifies matters in that the data and parity are striped across all three drives, but the principle of conservation of volume applies in the absence of compression and nowhere have I read that compression is used. If you are discussing RAID 5, remember that this mode does not provide 1: It provides some protection against drive failures by striping data across multiple drives and reserving one drive for parity, but any redundancy with RAID 5 is contingent upon the array not sustaining more than one drive failure at a time.

So, in RAID 5, there is only your original data plus the parity. There is no 1: John-Paul Palescandolo wrote: What is meant is. The p in the first layer is 01 XOR 02 so if drive 2 fails 02 can be recovered from Great article overview!

Mirrored and concatenated RAID options in Mac OS X

But I wish it were a little more prescriptive for home vs business users. For most home users that is sufficient. It would seem to be a great, affordable choice, except for one terrible design choice - proprietary, hardware-based, MANDATORY WD encryption on both drives that the manufacturer's info page says cannot be turned off, period.

Several of these are also listed in this article. What happened to Raid 10? Network managers use Raid 10 because the system of 5 drives can lose two without losing data. Skip to main content. Related Articles. Buying Guide. Great Gifts for Filmmakers. Handheld Gimbal Buyers' Guide. Brett Smith. Camcorders for the Holidays. Reply Reply. Jack L. Neither have Thunderbolt ports.

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Can any of the Thunderbolt options mentioned in this article be used in my environment? Do I need to stay with the USB-only solutions?

Geoffrey Ngai. Otavio C. John-Paul Palescandolo. I'm still wondering how this can be…. Whenever you change something on an existing RAID, be that installing larger drives or adding additional drives, it's necessary to create a new RAID system. Depending on the RAID controller and the amount of drives, you can select between different RAID modes to setup the disks according to your own requirements.

The exact definition of these terms depends on each model but following is a general description. Not all versions of Windows support this function.

Following instructions show how to create a RAID set with 2 disks. Scroll further down to see how to create a RAID 10 with 4 disks. If you use Mac OS X RAID 10 is useful for a storage enclosure with four drives, providing redundancy in case of a single disk failure yet still delivering fast transfer rates. The only option is to use the Terminal and the diskutil command or purchase and install a 3rd party software like SoftRAID. RAID sets that were created on other systems can still be accessed.

To learn more about the diskutil command, open the Terminal and enter man diskutil to call up the manual.

RAID Levels Explained

To prevent selecting the wrong disks and make it easier to identify the drives, we recommend to temporarily disconnect all other external drives and only connect the one which you would like to use for the RAID set. With macOS As an alternative, you could also use paid software like SoftRAID, which uses a graphical user interface, provides faster transfer rates, comes with more features and includes technical support. When creating a RAID 5 system as described in this article, hot plug is not supported! When disconnecting the drive, it is important to first unmount and then export the RAID system by using the commands seen in step Otherwise, the system might crash and corrupt your data.

If you simply turn off the computer, this step is not required. When you reconnect the device or restart your system, the drive will automatically mount again. Information in this article is subject to change without notice. AKiTiO does not make any representations or warranties implied or otherwise regarding the accuracy and completeness of this document and shall in no event be liable for any loss of profit or any other commercial damage, including but not limited to special, incidental, consequential, or other damages.

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Information Center - Technical Articles - Whitepapers. Details Last Updated: Monday, July 16, Preventing data loss Just because a product supports RAID doesn't mean the data is automatically safe.

macOS Disk Utility Can Create Four Popular RAID Arrays

Protecting existing data during setup If you have some existing data on the drives that you intend to use in a new RAID, make sure to backup the data in a different location first. Backup all the data from the old drives in a different location. Replace or add the new drive s. Set your preferred RAID mode and format the drives. Move all the data from the backup location back to the newly created RAID. RAID 0 - Disk striping is used where speed is the primary objective. RAID 1 - Disk mirroring is used for redundancy in case of single disk failure.

RAID 5 - Disk striping with parity is a good compromise for performance, redundancy and storage capacity.