Redundant Array of Independent Disks, a scheme to utilize multiple hard drives to increase speed and reliability or to provide for data recovery in the event of hard drive failure

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Mac Pro going to sleep when rebuilding RAID array

I have a Mac Pro which is going to sleep during a RAID array rebuild. The disks are spinning down during the sleep, so I worry that the array will either not successfully build, or will require ...
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35 views

howto encrypt “WD My Passport Pro” online? support.wdc.com with dangerous solution (no security)

I wish to encrypt my WD My Passport Pro drive. I receive error With Google I found An error message occurs when attempting to create an encrypted backup on a My Book Thunderbolt Duo in the Mac ...
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27 views

Are there tweaks in Time Machine or VirtualBox by Oracle to make Time Machine better handle small files within a .vdi?

Within a very important VirtualBox, which was at the time approximately 400 Gigabytes, Time Machine is not backing many files inside this machine, for even several months, despite them being changed ...
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120 views

Mac Pro APPLE RAID volume questions

My Mac Pro 4.1 (circa 2009) has a MacPro Raid Card and the software shows two storage volumes - one 1TB SAS disk and one 2 TB SAS RAID volume. The removal of the Parallels volume leaves me with the ...
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90 views

How do I remove everything Parallels?

Background: Mac Pro 4.1 circa 2009, specs: OS X El Capitan Version 10.11.3 (just updated last weekend) SN - H09440CK20H 2 - 2.93 GHz Quad-core Intel Xenon processors 32 GB RAM 2 - 1 TB HD 1 - ...
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2answers
358 views

RAID 0 setup does not contain full disk space from slices

I just setup a striped RAID 0 on my 2012 MacBook Pro with two SSDs. One drive is 256 GB and the other is 500 GB, but my RAID disk is only 510 GB. Disk2 is my RAID disk, with disk0 and disk1 being ...
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29 views

RAID 0 erases when you disconnect

I've decide to buy a USB 3.0 RAID (CADA-U3A2 Series). I've configured it and seems to work fine. But when I disconnect the power it loses all its data, and my Mac ask me to format the drive again. ...
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1answer
27 views

Running OS off RAIDed drive?

I recently asked about bottlenecks in the Mac architecture (The Mac Pro 12 core 2010 model) to try to create a set up that optimizes performance. It was my intention to take 2 SSDs and RAID them on ...
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1answer
59 views

Is RAID1 volume usable while rebuilding RAID after disk failure?

One disk of my 2-disk-RAID1-stack has failed and I'm about to replace it. Is the volume usable—i.e. can I read & write just as I normally could—while Disk Utility is rebuilding the RAID?
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28 views

Restore RAID Mirror?

I had a 3TB mirror using Apple software RAID on Mavericks—the two disks are in a USB3 JBOD and the USB3 card in my Mac Pro only works with Mavericks or older. Last night I demoted one of the disks so ...
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38 views

RAID + FileVault and startup partition

From this answer: Why doesn't FileVault work on a RAID volume? I learnt that it is possible to have RAID and FileVault together. However it seem that the solution is for a separate data volume not ...
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61 views

Xserver Early 2009 Raid Card

I have an Xserve 2009 with Yosemite installed. The 3 hdd are configured as RAID5. It was working fine until this morning. Upon reboot I see the folder with the question mark. I put a macbook pro in ...
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27 views

Raid 1 question

I am very new to Apple, took delivery of a iMac Retina 5k yesterday. I have two 6 TB drives configured in RAID 1. I am using Time Machine to back up my files to these drives. My question is: Can I ...
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63 views

How to solve the issue of software RAID inconsistency if a Mac has multi-boot or if only one drive is plugged in?

Let's say if we buy 2 external hard drives, be it Western Digital or Seagate, or any other brand's external hard drives, and set up on a Mac Mini as software RAID 1 (mirror), what if we actually have ...
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1answer
239 views

Does OS X's Disk Utility create hardware RAID or software RAID?

I created a mirrored RAID (RAID 1) using 2 Western Digital 2TB external hard drives before, using Disk Utility on a Mac. For this, it should be software RAID. And then I got a WD Thunderbolt Duo ...
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1answer
179 views

Best way to expand JBOD with RAID?

I currently have a Hornettek Enterprise Quad bay USB3 JBOD hooked up to a Mac Pro running Mavericks. It has two 3TB disks which are mirrored (RAID 1 using Disk Utility) and contain a mixture of ...
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77 views

Mac Solution for Software RAID 6

Disk Utility apparently only supports RAID 1 and RAID 0. Is there a way to do software RAID 6 on a Mac? A Mac GUI is preferred but I can use any UNIX program.
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16 views

Encryption and Partitioned RAIDs

I use a Thunderbolt Duo configured as a mirror RAID 1. I understand that it is incompatible with FileVault. Is there another encryption system I can use on my MacBook Pro?
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1answer
125 views

Expanding Flash Storage with SDXC

I see on a Macbook Pro, you can expand your current storage space with SDHC or SDXC. Being a Linux user I know you can use RAID to expand storage with 2 disk, so storage looks like 1 HD. However, most ...
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24 views

Why does disk utility want to erase my RAID 1 set?

I have 2 disks, the first a 2 TB and the second a 5 TB the 2 TB is split into 2 partitions and the 5 TB into 3 partitions with one 2TB RAID0 set, one 1TB RAID1 set and one single 3TB partition. I now ...
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2answers
534 views

Simple Low-Cost Network Backup System - Drobo? Alternatives?

I'm hoping to graduate from manually copying important files to multiple external desk or portable drives; affordably. We have 3 Macs and an iPad or two. I have just now learned about Drobo, who as I ...
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1answer
43 views

Continuous volume shows too much available space

I have a continuous volume of two identical SSD drives. 2 terabytes, 1.92 terabytes in practice. I plugged it in via USB today and finder and disk utility show that all the space is available. ...
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144 views

Pros and cons to JBOD setup on MacBook Pro with two internal SSDs

I've got an original Apple-installed 120GB 3G (3Gb/s) SSD which I'll be moving into the optical bay using an OWC "Data Doubler" and swapping a new 240GB OWC Mercury Electra 6G (6Gb/s) SSD into the ...
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1answer
148 views

Backing up a RAID experiencing I/O issues

I recently began working for a company that has an OS X Server with a PROMISE Pegasus Thunderbolt RAID (RAID 5) attached as a file server. Within my first couple of days, it became apparent that users ...
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1answer
496 views

VMware ESXi compatible RAID card for the Mac Pro

I have a 2009 Mac Pro that I'd like to add a hardware RAID card to. I am running VMware ESXi with various OSes running as VMs. The Apple RAID card is not what I'm looking for. I would also like to ...
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1answer
3k views

How Do I Partition A Raid 0 Using Disk Utility?

I have just purchased a WD My Passport Pro. It comes in a striped RAID 0 configuration comprising of two 2TB drives. I want to partition the drive into 3: Photoshop Cache Lightroom Catalogue Video ...
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1answer
223 views

Are there any Hardware RAID Cards with Batteries that will work in a Mac Pro 3,1?

I'm looking to install Proxmox on my MacPro3,1 and it's suggested that if you plan to use the system for 5 years that you install a Hardware RAID card with a battery in it, so that if the power goes ...
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1answer
192 views

Restore a lost partition from degraded software mirror RAID

I used to store my valuable files on Apple software RAID (mirror). Recently one disk has failed and the mirror became degraded. I rebuilt the mirror using new drive, following this guide, but seems ...
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2answers
370 views

Apple Time Machine, Drobo and studio computer [closed]

I bought an Apple Time Machine. I have a home studio with several hard drives. I'm trying to find the best way to setup Time Machine to keep all my storage backed up all the time. Studio Computer ...
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1answer
112 views

Combining two RAIDs

I have an OSX machine which houses 2 RAIDs made of 6 disks. The 2 RAIDs contain 6TB of data; they were set up with Disk Utility: A 'safe' 4TB RAID-1 (mirror) made of 2 x 4TB disks, 3.68TB used A ...
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1answer
102 views

Need solution for RAID from old Mac

I have an old Hackintosh which I no longer use, except as a server to access 2 RAIDs made of 6 disks. The machine is too big, uses too much power, makes too much noise, and generates too much heat to ...
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347 views

Getting rid of “The disk you inserted was not readable by this computer” message at startup

I have a couple of disks in Windows software mirroring RAID in my system, and when OS X (Mountain Lion) loads, the same message pops up (twice) each time: The disk you inserted was not readable by ...
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1answer
566 views

Is it possible to restore a backup from a single disk on RAID1?

I want to setup a Mac Mini Server with the following configuration. The Mac Mini server has 2*1TB HDDs. I want to do the following: Setup the server Create a backup of the system on an external ...
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1answer
46 views

Will the Mac Mini late-2012 try to reformat dual PC raid discs when I plug them in?

I have a new Mac Mini late 2012 model replacing a PC with dual 2 TB hard drives set up in Raid format mirrored and auto save. I want to put them into a caddy, a Startech 4-bay SATA version with a ...
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2answers
986 views

How can I mirror two macbooks [duplicate]

I have two macbooks. I want them to be exact copies. They have different CPUs, RAM, but they have the exact same drives. I work on both of them. I never work on them simultaneously. Can I setup ...
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1answer
27 views

Manually force sync on AppleRAID 1

I'd like to force a sync or repair on my AppleRAID set as part of a regular maintence. Under Linux (md) I can do this by writing to control devices. Diskutil does not seem to offer me such an option.
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1answer
291 views

Promise pegasus 4x2TB Disk upgrade [closed]

I have a promise Pegasus with 4x2TB Hitachi disks, would it work with any (or some specific 4x4TB disks?
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1answer
79 views

Raid 0 - Why am I constantly losing data?

I have a Mediasonic 4 bay drive enclosure like this with four 3TB Toshiba HDD's attached to my hackintosh machine. The drives are in a RAID 0 configuration setup with Disk Utility. I've had this ...
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1answer
225 views

RAID 0 On 21.5" iMac Late-2012

I am about to get my fusion drive upgraded to a 256gb SSD on my Late-2012 21.5" iMac that I got from work (don't worry I have a company upgrading it, and yes they know its a Late-2012 iMac). When ...
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252 views

Raid two external hard-drives with read/write support on Windows & OS X

I have a USB 3 HDD enclosure that currently has two 1TB drives in it. I am looking at buying another external USB 3 HDD drive (not an enclosure). I am currently running the external enclosure with the ...
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1answer
66 views

How does Time Machine make room for new users?

This is more of a hypothetical question, but we've been using a Time Capsule to back up our Macs, and it has steadily been filling up since the year or so that we've had it. We've since brought a few ...
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1answer
98 views

Can one slice of a “Disk Utility” RAID mirror be moved to a new computer?

With a 2-disk RAID mirror created in Disk Utility, after one disk fails, can the remaining good disk be moved to a different Mac and used successfully?
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2answers
108 views

RAID 0 and 1 combo?

If I understand correctly, RAID 1 is two drive that mirror each other, and if one fails, it can be replaced and some hours later, it's a mirror of the good drive. Raid 0 combines 2 drives in a way ...
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1answer
291 views

Something like MHDDFS for OS X?

I'm trying to have my Mac Mini take over all my server's functions (I'm recycling the server hardware into a Linux workstation). Its pretty much all done, except for the file-serving portions. ...
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207 views

Repurpose 2006 Mac Mini for Time Machine with external HDD

I have a Apple Mac mini "Core Duo" 1.66 from 2006 sitting around. I also have on order a CiT 3.5 inch USB 2.0 Dual SATA HDD Enclosure and was thinking of getting a WD Green 4TB Desktop Internal SATA ...
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1answer
222 views

How to use iostat with AppleRAID volume?

When I try iostat disk5, I get the error: iostat: could not record 'disk5' for monitoring Iostat works with my other drives, and with the individual disks which make up the RAID volume. How can ...
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1answer
317 views

Cannot boot Mac Mini with striped RAID 0 set

Today we could not get one of our machines running with 10.9 and RAID 0 which stripes the data on the boot volume. After several hours of doing the 'standard' tasks like fixing permissions etc, we've ...
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53 views

Can I enlarge a RAID10 with Disk Utility?

I have a 4TB RAID10 (4x2TB disks) created with Disk Utility. I also have 4x4TB spare disks. Can I enlarge the RAID10 to 8TB (4x4TB)? This post suggests that I can break each mirrored set, and ...
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1answer
303 views

Can I run two non-thunderbolt displays from a thunderbolt RAID device?

It seems like this question has been asked a million times, but after a few hours of reading similar questions, I have not been able to find a clear answer. I have a mid-2012 Macbook Air running OS X ...
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2answers
267 views

Setting Up Raid iMac

I have one lacie 2big thunderbolt 4th unit setup as raid 1. I want to add a lacie 2big thunderbolt 4th unit. How do I get it set up so the entire unit 1 is mirrored onto unit 2(Raid1)?