RAID, an acronym originally for Redundant Array of Inexpensive Disks (today usually interpreted as referred to as Redundant Array of Independent Disks), is a technology that provides increased storage performance and reliability through redundancy by spreading data across multiple disks using various algorithms (RAID-levels). RAID can be implemented in hardware storage controllers, or in software, usually as operating system/kernel features.
Questions tagged [raid]
3655 questions
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Building a NAS, Raid vs HBA?
Building a NAS with the hardware below. I've been reading through the IXSystems forums as i'm thinking about using FreeNAS or Unraid for the OS. I see that ZFS requires HBA cards rather than raid cards and i have both. I'm trying to see what is the…
UserSN
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mdadm alerts configuration
I have a dedicated server in OVH. mdadm is installed and configured automatically, but I need configure scans and alerts.
I checked some guides in internet but I'm not safe that this is the correct steps, please can you confirme me this is…
MindServer
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RAID status monitoring HPE Smart Array E208i-p SR Gen10
It shouldn't be this hard, but I can't figure out how to monitor the RAID status with the HPE Smart Array E208i-p SR Gen10, in a HP ProLiant DL360 Gen10 in Linux.
I can't find a file in /proc or /sys.
arcconf says: Controllers found: 0.
ssacli…
Halfgaar
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Why does active-active configuration degrade performance compared to failover?
We are setting up the new storage for an HPC compute cluster that we are managing for applied statistics, bioinformatics, and genomics.
Configuration
We have the main enclosure with a Dell EMC ME4084 (84x12TB 7200rpm) and an additional enclosure…
Nicolas De Jay
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What does this message from HPSA RAID controller mean?
I have two identical HP servers with hardware RAID controller.
On the RAID I have 2 SSD's as RAID1 and 3 x 1 TB SATA disks as RAID5.
On both servers I get messages like this about RAID5.
Jun 23 14:58:35 ve18 kernel: hpsa 0000:02:00.0: scsi 0:1:0:1:…
Nick
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Smart Array P420i Permanently replace Predictive Failure Disk with Spare
I have a Smart Array P420i configured as below:
Smart Array P420i in Slot 0 (Embedded)
Array A (SAS, Unused Space: 0 MB)
logicaldrive 1 (838.1 GB, RAID 5, OK)
physicaldrive 1I:2:1 (port 1I:box 2:bay 1, SAS HDD, 300 GB, OK)
…
5Lights
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Rebuild a temporary disconnected RAID device
If I build a RAID 5 array (specifically MD RAID on Linux) and then 1 of the drives disconnects for whatever reason, does that drive need to be rebuilt from scratch if:
No data has been written to the array.
Some data has been written to the…
Livy
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Perc H710 on Windows 2016
Excuse me for a naive question. I just got R720 with 4x3T on RAID 5 using H710. In the server manager, I saw disk with 8T which I suppose is the virtual disk I set up using H710; In volumes, there is a C: with 2T capacity. I can find the 2T storage…
cccfran
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HDD SMART interpretation
I need your opinion if the drive below is failing.
When I run "smartctl -a /dev/sda -d megaraid,1", 2 errors are posted at the end of the output, stating "Error: WP at LBA". I don't see anything suspicious in the SMART parameters.
Here is the…
Alexandru
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unable to clear superblock on drive
I have a USB thumb drive that I briefly used in a raid 1 array. I don't need it in that array anymore (but need to add it to a different array) and hence would like to get rid of the old superblock but I can't. I tried:
$ sudo mdadm…
stdcerr
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UDMA CRC SMART Reporting, Alternative Software/logs for Diag
* Update *
As it turns out the human readable portion of SMART reporting numbers is pretty useless for the UDMA CRC errors and you just have to track the RAW value. After flushing through over a dozen hard drives or so I never saw the readable…
Whyudodis
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ext4 raid5 corrupt group descriptor
I have a raid5 NAS on Open Media Vault, with 3x 2To disks.
A few days ago I've inserted a spare disk from another raid.
I did not see it at the beginning, but I think that changed disks order.
Then I run cfdisk to make a new volume, maybe on the…
Barium Scoorge
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How to Add Another Physical Drive to Adaptec maxView RAID6 Logical Drive
I have an ASR71605. I've added another drive to the controller which shows up in max view as ready. The logical drive is RAID 6 with 5 drives in it now. I'm adding this additional drive which is identical to the other 5. (same brand, same model,…
James Hancock
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ReclaiMe takes forever. Need a faster solution
Arrgh! I had a 4-drive RAID-5 array running nicely on an Intel DX58so motherboard until one of the drives gave up. No problem, right? That is why we use RAID-5, right?
Instead of alerting me and continuing to run on 3 drives, Rapid Storage decided…
Maggie Cummings
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What's the difference between a HP P420i (2GB FBWC) and a HP p822 (2GB FBWC) Raid
I am looking to buy a HP ProLiant DL380p Gen8 2U 12x 3.5 (LFF) server and one of the configuration options I am being offered is whether it comes with an HP P420i or a HP p822 Raid Controller.
However, from looking at the documentation on both of…
DigM
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