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Questions tagged [hardware-raid]

RAID solution with hardware assistance. RAID parity calculations can be performed by either the main CPU, or by a separate processor on the RAID controller card.

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How is RAID3/4 is implemented for more than 4 drives?

I understand that, RAID 3/4 for 4 drives is: Parity Drive = D1 XOR D2 XOR D3. But what is there 5 drives or more? For example 5 or 6. How many parity drives is needed, and how XOR algorithm is working for this case?
Dmitry Sokolov
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Hp Proliant DL120 G7 won't show ORCA

I have on old server, HP Proliant DL120 G7. I configured it with 4 500GB Hard Disk in RAID 10. With this configuration I was able to enter in ORCA setup and the hard drives where connected. Then I changed the drives to 4 1TB Hard Disk. I wasn't able…
amicoderozer
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HPACUCLI Remotely make active spare permanent member

We have an old HP server - we let the HPE contract expire as it'll be decom'd soon, and our monitoring has flagged a failed disk. For various reasons it's difficult to organise access to the server, so ideally we'd like to remove the Failed disk…
Litch
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DL380 G10 - P816 controller - Extending LD produces error about max size, even though there is more space in the Array

Array A on this DL380 G10 consists of 9 1.9TB drives in a RAID 5 config. It reports unused space of 619995 MB. There are two logical drives, LD 1 with 13.55 TB (14,000,000 MB), and LD 3 with 97.66 GB (100,000 MB). I wanted to extend LD 1 to use some…
MartinF
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Can not access PowerEdge Expandable RAID Controller Configuration Utility

I've looked online but can't find a solution. On post it says press ctrl+r to enter configuration utility and i do that. it then says 1 virtual drives found on the host adapter 1 virtual drives offline 1 virtual drives handled by bios Initializing…
Optiplex
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How to get temperature readings of HP P420 RAID PCI-e card?

I have an HP Proliant ML110 G9 Server. Added an HP Smart Array P420 PCI-E card to have real hardware RAID on the server. Everything works fine, but I noted that the P420's processor was extremely hot (I realized by touching the sink). Added an extra…
J.L
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Is putting Server 2019 (full os with hyper-v) and 2 2019 Guests on a single two-disk Raid 1 array reliable enough?

We're currently experiencing some significant cpu/ram performance issues with 2 VM's on our current HPE 2015 tower server (2x Xeon 8c/8t 1.7ghz) running server 2012 for HV and guests (10 guests total), so we're looking at getting a HPE DL325 1x…
Joe
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Data layout on RAID-1 Array

For the sake of this question, assume a RAID-1 array of two identical drives. RAID-1 (Mirroring) stores an identical copy of the data on both drives. How identical is the drive layout? Are the drives sector-by-sector identical (logical) - Excluding…
GCon
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Hard disk drivers for Windows Server 2008 R2 installer

I'm trying to install Windows Server 2008 R2 on my server that uses RAID 1 on 2 146GB SCSI drives. However, when I get to the partition selection screen, nothing displays. I'm guessing this is because the installer doesn't know how to interface with…
panoptical
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Recover data from IBM x3650 with SYS BRD ERR

As in every sysadmin nightmare after shutting down a server I'm not able to power it on any more. The server is an old IBM x3650 M4, which has been shut down because unused and of course when not available users recalled they had something left…
Maxxer
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Very Low IOPs on Array of 16x 15K SAS Drives

I'm having issues with one of our servers that is running 16x 900GB 15K SAS drives in a RAID 1+0 Array on a PERC H710P, under normal load its doing ~450 IOPs (almost all writes) and has a backlog of ~80ms, when testing the speed with dd if=/dev/zero…
philliplcg
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Does this SMART report indicate a bad disk?

On a remote server, I have 2x3TB drives set in raid 0 with SLI raid card. I tried to run SMART tests to see if drives have a problem because server become unresponsive and one drive had to be put back "online" manually. Drive ids are 4 and 5, this…
adrianTNT
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What is the risk of RAID 0 for a *single* disk versus no RAID on that disk?

I have a server that I'm having trouble with getting the drive to show up without using RAID. However, that's different question. This question is about the problems running a RAID 0 on a root drive in a server and what potential problems it could…
user250795
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How to mount a RAID array on a Linux server if it does not appear to be listed?

I am helping to administer two CentOS 5 servers, on the "user" side of things. A RAID 1 array and a separate single hard drive were recently added by IT support. According to the IT support, both of these are ready to be mounted on either of the…
Jake
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Replacing RAID 1 with larger drives - professional standards

I work with one of the biggest hosting companies on the planet. I got a dedicated server with hardware RAID 1 and two SAS 15k disks. I asked my hosting company if they could replace SAS with much bigger SATA drives as I need space on this machine, I…
rumburak
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