Questions tagged [raid]

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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How to determine wasted space by large chunk size on macOS RAID array?

Working on a system that was created with a macOS RAID array with 256k chunk size for the members. The drive was originally to be used for video and image editing and storage, but has now become a ...
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37 views

Two 4TB hard drives — how can I create a RAID 1 with two 2TB partitions?

I have been struggling with trying to get Disk Utility to allow me to divide a 4TB HD into two 2TB partitions, and then have a mirrored raid of that for redundancy. Is this not possible?
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369 views

Raid 0 on two SSDs on Macbook pro Mid 2012 (non retina) running Catalina?

I am using Macbook pro-Mid 2012 (non-retina). There are two SSDs, one 850 EVO (250 GB) and 860 Pro (256 GB). Both have Catalina installed and running perfectly. I can switch easily using startup disk ...
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Problem upgrading Mac Pro to macOS High Sierra

I have macOS El Capitan on my Mac Pro and I am trying to update my Mac Pro to macOS High Sierra so I can update it to Mojave since Mojave requires to have at least macOS High Sierra. But when I run ...
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6answers
3k views

Lifespan of 2011 iMac

I have a 27" 2011 (i7 3.4ghz 24GB RAM) iMac that I just replaced the drives (1 SSD and 1HDD) in 2 years ago. It runs pretty well now, but is just starting to slow down (and pales in comparison to ...
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1answer
113 views

On MacOS 10.15.5, “About This Mac --> Storage” is not recognizing my RAID-1 drive correctly

I upgraded from El Capitan to Catalina 10.15.5 on a MacbookPro mid-2012 , the oldest HW that Catalina will run on. Then, I created a RAID-1 drive using 2 USB disks. "About This Mac --> Storage" is not ...
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2answers
93 views

How to reclaim all the space on a NAS RAID drive for us as a regular Mac drive

I have just upgraded several hard drives on our Synology, and now have 2 bare metal drives of smaller capacity (6TB) that I'd like to reuse on my Mac for other purposes. However I can't seem to get ...
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1answer
32 views

Running Raid0 on MBP 2011

I have a higher end (i7, 2.5ghz, 16gb RAM) 2011 MBP with an older HDD that has been pretty unreliable for the last year or so. I have an unused/unopened 250bg SSD sitting on a shelf and was thinking ...
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0answers
21 views

Are RAID volumes compatible between OSes?

I have a RAID 1 (mirrored) volume made of 2 USB external drives which was created on macOS High Sierra and I wanted to check if I can plug these drives into another machine running an earlier version ...
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3answers
384 views

RAID storage drive failed - what to do?

I have a macOS Server setup which is connected to two RAID (0, I think) systems. One of them does not work anymore. Disk Utility shows that one drive is missing/damaged. It is not missing, thus it ...
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8 views

RAID member needs to be deleted, not showing up in terminal

The drive is 500 GB. Could it be anything besides a messed up connector or something? I've tried multiple SATA connectors. I type diskutil list and get this: /dev/disk0 (internal, physical): #: ...
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1answer
416 views

macOS Catalina renamed external volume name

I have an external APFS RAID 1 array made of three USB hard drives connected to my Mac Mini. Before I installed Catalina (10.15) on my Mac Mini, this array was called "Primary" and was mounted as /...
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203 views

Raid set add member: com.apple.StorageKit error 118

I have a failed RAID set, and am trying to add a replacement drive. Every time I try to repair, add member, or add spare, it fails immediately with com.apple.StorageKit error 118. Does anyone know ...
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1answer
171 views

Adding a new hard drive to RAID1 software RAID fails

I've got a Mac Pro 1.1 running macOS Server 10.6.8 that I want to use as a RAID-Server. I use Disk Utility to run a RAID1 set with two 500GB hard drives. Now adding a third 500GB hard drive to the ...
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242 views

Can a RAID be a Time Machine backup?

If I configure a large external drive as a RAID, can TimeMachine use it for backups? I see it can use a Drobo, but can it use even a "home-brewed" RAID?
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448 views

Computer Froze, Now Raid over iSCSI (APFS Format) is no longer mountable. GPT/MBR not present

I was exporting video in Premiere and the computer froze so I had to restart. Upon restarting, I noticed the raid drive I connect to over iSCSI was not showing up on my desktop. However, it appeared ...
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14 views

Check files on both HDDs on RAID 1 array

I just set up my LaCie 2big Thunderbolt as RAID 1 array. Is there a way I can look at both HDDs to confirm, that all my data is actually mirrored?
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1answer
66 views

Move SoftRAID to a new home

We have 3x4TB 3.5" HD's in RAID 5 (SoftRAID) in a 2012 MacPro tower. Is it possible to physically remove them and insert them into a larger enclosure and it will continue operating?
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1answer
618 views

How to repair Raid 0 Via Terminal

I have 2 @ 4TB drives in an 8tb Raid 0 stripe enclosure that has become corrupted. I have tried to repair the volume via, disk utility, terminal and single user mode with no luck. All 3rd party ...
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1answer
624 views

Recovering a RAID 0 volume

In the process of upgrading a 2 4tb disk RAID 0 array from an iffy LaCie drive to a faster/more reliable USB enclosure I have lost data. The backups take a long, long time to restore so I'm hoping to ...
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0answers
19 views

How to suppress warning about unreadable disks?

I have a dual boot machine, High Sierra and Windows 10. I have 4 disks in a software RAID created in Windows. Every time I boot macOS, it warns me that these disks are unreadable and must be ...
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0answers
3k views

Mojave and RAID

Does anyone know if Mojave will support booting from RAID drives? My MacPro 5,1 has RAID hard drives and two striped SSD's that boot into Sierra. I've been unable to update to High Sierra on this ...
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1answer
538 views

How can a Mac split a single backup to two independent, external drives

I have been asked to perform an emergency backup of a device showing signs of HDD failure. I'm being provided with two individual external hard drives to accomplish this. Each drive is independently ...
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0answers
210 views

Mac Pro 5.1 (mid 2012 ) Fusion Drive (2 SSDs and 1 HDD)

I have 2 SSDs 160GB each and a 4TB Disk (all SATA) I was thinking to put them in Fusion Drive setup, will it work? how it will work? which setup is recommended if possible? any speed benefits? ...
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1answer
6k views

Terminal command to force-install Mac OS High Sierra onto a specified drive?

I'm wondering if there is a way to install Mac OS High Sierra using terminal onto a specified drive? I'm working with a bit of a unique situation as I've been running Mac OS Sierra successfully in a ...
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1answer
94 views

Possible to mount a RAID1 pair over USB?

I have a pair of disks which I configured as RAID1 (mirrored) via Disk Utility on my Hackintosh. I am now traveling, and took the disks with me, and want to mount them with my MacBook Pro using a USB ...
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1answer
1k views

How to create exFAT or NTFS RAID 1

I am looking for a way to create a RAID 1 Volume from macOS Sierra with a format that will be readable from both Mac and Linux. Using DiskUtility I can not seem to find a way to format the RAID in ...
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1answer
265 views

RAID array creation in macOS

I have a LaCie 2big Thunderbolt 3 RAID drive. I'm currently using LaCie RAID Manager software to create RAID array. I noticed that MacOS is recognizing the RAID volume as an external drive instead ...
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1answer
541 views

Time Machine restore stuck on “Preparing <destination disk>” for more than 24 hours, how can I diagnose the nature of the problem?

Recently I got myself into quite a pickle that eventually required I format my Mac’s dual-SSD RAID-0 array and restore from a Time Machine backup. Unfortunately Time Machine has spent the past 24 ...
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0answers
3k views

APFS on RAID: recommended course of action?

I recently upgraded my Mac Mini Server's dual SSDs and found myself needing to re-create the RAID-0 array from scratch. (I am running the mainline High Sierra 10.13.1 on a 6,2 MacMiniServer from 2012.)...
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4answers
240 views

How would I architecture Network Attached Storage?

This is a sequel (1, 2) question. I'm interested in setting up a home networking solution. One or more individuals would be able to access their accounts from any one of multiple Macs around the ...
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1answer
170 views

Create a RAID 1 with only one disk?

I have a MacBook with an SSD, so space is limited. I've been using a single external drive to store my overflow, but would feel a lot more comfortable if it was on a RAID 1. So, I've bought an 2 bay ...
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2answers
3k views

Is it possible to run OpenZFS on MacOS Sierra on a Mac Pro

I have a Mac Pro with a PCIe flash startup drive running MacOS Sierra. I would like to fill the 4 empty SATA HDD bays with drives and use OpenZFS to create a pool/volume. Is this configuration ...
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3answers
144 views

I can not explain my disk usage

I have a RAID 5 solution with 4 disks of 2TB. That gives me 6TB disk space. Now Disk Utility tells me that my actual usage is 3,5TB and I have 2.5TB free space. But when I add up the disk usage of the ...
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1answer
462 views

Time Capsule & 3TB HDD Raid 1 setup

I have the Airport Time Capsule (3TB) connected to a 3TB HDD via the Airport Time Capsule's USB2 port. How can I set them up with RAID 1?
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1answer
2k views

How to Delete Drive That is Missing From a RAID

I had a RAID drive fail. I replaced the bad drive with a new one and, after some work, got it up and running. I want to delete the bad drive from the config. This is the latest listing: AppleRAID ...
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197 views

Moving or creating Recovery Disk with dual internal SSD with RAID

I have removed my optical drive and installed a second SSD in its place. To do this I partitioned the first SSD to hold macOS Sierra. The other partition was RAID0 with a second SSD. I seem to have ...
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1answer
385 views

How to get data on HW RAID 5 without initializing disk? RocketRAID eSATA connection died but USB3 works and shows RAID5 OK?

What the pluck moment with my hardware RAID: eSATA connection to my SansDigital external 5-bay tower stopped working, not sure why, card definitely warm. Shut everything down, disconnected the eSATA ...
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0answers
234 views

How can a raid set be renamed

I wasn't paying attention, and now I have a raid with a name similar to that of the boot partition. I'd like to name rename the raid set to a name that reflects the partition name. E.g. If the file ...
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1answer
142 views

For a Western Digital Duo, what's the difference between creating a RAID using WD Drive Utilities vs. OS X (diskutil)?

For a Western Digital Duo drive, is there a major difference between the two? OS X Disk Utility doesn't have the RAID feature now, but OS X can still create RAIDs via the command line and diskutil. WD ...
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2answers
656 views

Swapping HDD RAID 1 with SSD in Mac Mini

I have a Mid 2011 Mac mini with 2x 500G HDD configured as RAID 1. Recently one of the HDD died. I planned to replace the dead HDD with a 500G SSD, and let the RAID 1 rebuild Is this a viable ...
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1answer
76 views

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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0answers
231 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 OSX ...
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122 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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1answer
577 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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1answer
1k 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
984 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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1answer
48 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
455 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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823 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 6TB,...