17
votes
Accepted
Expand a Linux MD RAID 10 array to use larger disks
Complete the following steps for each disk; replace /dev/sda1 with other disks as necessary. You must complete all of these steps for one disk before you can proceed to the next disk.
Mark the disk ...
- 46.2k
10
votes
Best performance: Windows 10 software striping vs. storage spaces simple
Performance of single HDD
this is just our base performance of single drive
Striped dynamic disk over 3 HDDs
this what you call Windows software RAID
3-column simple Storage Space over the same 3 ...
- 2,908
6
votes
How does Synology Hybrid RAID work?
Synology Hybrid RAID works as follows:
One md RAID 1 across all disks for the NAS root file system (about 2.3GB on my system).
One md RAID 1 across all disks for swap (about 2GB on my system).
One ...
- 317
5
votes
Accepted
Is a Simple Storage Pool the same as software RAID 0 in Windows 10?
The Simple (No Parity) resiliency option allows you to create a raid 0 or JBOD.
When adding the disk drive to the storage pool check the box that says Optimize drive performance across all drives to ...
- 66
5
votes
How-to change the name of an MD device (mdadm)
None of the other answers worked for me but in Centos I used the following guide. The issue is that /etc/mdadm.conf is not really used at boot time and only gets updated when a new kernel is ...
- 265
5
votes
How to get an inactive RAID device working again?
A simple way to get the array to run assuming there is no hardware problem and you have enough drives/partitions to start the array is the following:
md20 : inactive sdf1[2](S)
732442488 blocks ...
- 265
5
votes
Programmatically check Linux RAID array (MD)
Another solution is to query the disk states cat /sys/block/md*/md/dev-*/state.
It is easier, and it does not require super-user rights.
The possible values (can be comma separated) are described ...
- 347
4
votes
alerting you when a hdd is missing with software windows raid
There is a lengthy thread that discussed this exact problem on Microsoft TechNet:
https://social.technet.microsoft.com/Forums/windows/en-US/5d3c3d5c-38ee-4a3d-9243-17712556eab8/windows-7-has-no-...
- 101
4
votes
Accepted
Can I create a degraded mdadm raid10-near (raid 1e) array?
I tried it with
mdadm --create /dev/md0 -n 3 -l 10 -p n2 /dev/sda2 /dev/sdb2 missing
...
mdadm md0 -a /dev/sdc2
and it seemed to work.
Since it operated in degraded mode I can assume data is ...
- 191
4
votes
What happens when you remove a drive from linux raid?
RAID 0 will implode as soon as a single disk fails, as the data is spread across the disks, regardless of the size the the partition/volume in comparison to the array (a volume that's 1/10th the size ...
- 113k
4
votes
Accepted
Is there a way to install Windows onto Dynamic disks?
Officially, Windows supports using Dynamic disks for the system volume, but only in the "Mirror" mode, as that's the only mode supported by the minimal drivers used by the Windows bootloader ...
- 466k
3
votes
Expand a Linux MD RAID 10 array to use larger disks
You'd want to swap out each disk one by one firstly.
To do this you'd 'fail' each disk, and replace it with it's new 8Tb replacement, infact if you have the spare ports, you can add the extra disks, ...
- 6,803
3
votes
Does software RAID 1 in Windows 7 improve read speeds?
Just tested, 2-120GB SSD on windows 10.
RAID 0 increased both read and write dramatically (non-raid read was 450MB/s, raid-0 read was 820MB/s). Raid 1, write speed is the same, read speed increased ...
- 31
3
votes
How to convert a software RAID 1 partition to non-RAID partition?
mdadm --zero-superblock may not be enough, the partition information may need to be updated, too.
What worked for me to successfully convert an 8TB drive with one mdadm RAID1 GPT partition /dev/sda1 ...
- 131
3
votes
Accepted
In raid, but does not appear to be an md device?
You probably wanted to write /dev/md0 and not /mnt/md0.
Device files are always generated in the /dev folder while /mnt is generally used to only mount them (connect the storage device content to the ...
- 2,086
3
votes
Accepted
Is there a way to replace RAID 5 drive without failing it first?
This seems to be a duplicate of https://unix.stackexchange.com/questions/74924/how-to-safely-replace-a-not-yet-failed-disk-in-a-linux-raid5-array
According to the accepted answer there provided you ...
- 6,440
3
votes
Accepted
Programmatically check Linux RAID array (MD)
While parsing /proc/mdstat i feasable, it becomes messy if you want to specialize on an array or want to cover different RAID levels and failure modes.
mdadm --detail /dev/md0 | grep -e '^\s*State : '...
- 20.4k
3
votes
Storage spaces on Windows 10 and tiering
The following example shows how to create a Multi-Resilient volume
where SSD tier is mirrored and HDD tier is configured in Parity.
New-StorageTier -StoragePoolFriendlyName Pool1 -FriendlyName ...
- 214
3
votes
btrfs ontop of mdadm raid - calculating stripes for corrupt sectors for use with raid6check
Alright, I got a somewhat working way to do this after talking to JyZyXEL on #linux-raid on Freenode.
raid6check reports total stripes so run it like this to see the basic information without running ...
- 41
3
votes
Accepted
How much space does a Linux software RAID1 REALLY occupy on its component devices?
Welcome Marcin to SuperUser.
It depends on the metadata format.
With the old 0.9 format, it is quite simple, as documented in the manpage for md(4):
The common format — known as version 0.90 — has a ...
- 738
2
votes
mdadm RAID Fast Setup with Empty Drives?
In general, a newly created array to enable device redundancy on zeroed disks would not need any prior syncing as long as the checksum (or copy, for RAID1) of those zeroed input blocks is also zero. ...
- 141
2
votes
MDADM reshape really slow
In case anyone ends up here like I did, this command kicked the sync into high gear for me:
echo max | sudo tee /sys/block/md0/md/sync_max
- 335
2
votes
Mounting raid5 disks without one of raid's member
A RAID5 array can tolerate a single drive failure. It consists of at least 3 drives.
You get this error message:
... assembled from 1 drive - not enought to start the array.
It says there is only ...
- 64k
2
votes
Linux MD software raid stripe cache size
As I understand this is cache for completed stripe of data, ready to be written to disk including parity data.
Before stripe is written to disk it must be formed somewhere.
That depends. I usually ...
2
votes
Can I use s SAS-expander without a dedicated hardware RAID Card?
SAS expander requires an HBA (Host Bus Adapter).
You can find SAS expanders that do not require a PCI-e interface, and those that do, simply use the PCI-e interface for power and a place to mount the ...
- 213
2
votes
Raid with 4 disk of different size
It seems that what you are looking for is a hybrid RAID 0+1. It's possible but it wouldn't work exactly in the way that you want it to.
The only way to get exactly what you want would be to have four ...
- 1,525
2
votes
Accepted
MDADM raid "lost" after reboot
Well, it turns out that in a last hooray, I tried to re-run the "create" command I previously use to build the array in the first place and.....guess who got is data back!!
Let say I'm gonna backup ...
- 315
2
votes
Where does the Metadata of Blocks in RAID is stored?
What metadata will be stored for a given file?
RAID has absolutely nothing to do with file metadata. It is purely a disk arrangement and as such just does a disk address to physical block translation....
- 93.8k
2
votes
Accepted
what is the performance of zfs IO operations with unequal sized disks?
Based on your question and the comments below it, you're asking whether it's a good idea to have a pool striped between two unequal sized disks. The short answer is, there's nothing inherently ...
- 1,088
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