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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Splitting a raidctl mirror safely
I have a Sun T5220 server with the onboard LSI card and two disks that were in a RAID 1 mirror. The data is not important right now but we had a failed disk and are trying to understand how to do this for real if we had to recover from a…
squarism
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Why is omreport storage vdisk controller=0 inconsistant output across servers
I wrote a script fetching the RAID configuration of the latest VirtualDisk.
On one server I get :
# omreport storage vdisk controller=0 -fmt ssv | awk '-F;' '/^ID/{print}/Virtual\s*Disk\s*[0-9]+;/{line=$0;value=$7}END{print line;print…
SebMa
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How does VMWare vSAN's RAID5/6 work
BLUF: How does VMWare's implementation of RAID5/6 work?
Below is VMWare's chart for RAID5/6 in vSAN:
It seems VMWare is altering RAID's terminology. When I hear RAID6 I think two parity of something; usually two parity drives and subsequently we…
Grant Curell
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Find which physical disks are in virtual disk from CLI
I have the following virtual disk :
# omreport storage vdisk controller=0 vdisk=14
Virtual Disk 14 on Controller PERC H730 Mini (Embedded)
Controller PERC H730 Mini (Embedded)
ID : 14
Status …
SebMa
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Can one VG (Volume Group) contain different types of PVs (Physical Volumes)?
The background is we have our database data directory on an LV which is located on a VG. We want to use the LVM's snapshot function to backup our database data, but this VG has no free PEs left. We also could not shrink the LV (we use XFS). The VG…
Ke Lu
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Issue with Volume Mounting after Server Restart
Originally on bkp-01 instance. The server and disk have manually been set to a different availability zone. The disk are running zfs for backups/snapshots. It's an old server with a manual Raid system.
Now if we check :
root@bkp-01:~# cat…
santosh baruah
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HPE Smart Array P410 - Replacing failed drive of a degraded mirror with a new one using ssacli with the failed drive kept connected?
A server is using attached drives without the HP hot-plug drive cage, with drives attached to P410 using two SFF8087 -> 4x SAS SFF8482 cables. I can add new drives while running, but cannot remove a specific drive (no way of IDing for now).
A mirror…
Pavel Hofman
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How is Hardware RAID for NVME drives configured on SuperMicro?
I've purchased as x13sae motherboard from supermicro which is advertised as
M.2 Interface: 3 PCIe 4.0 x4 (RAID 0, 1, 5) M.2 Form Factor: 2280 M.2 Key: M-Key
I have two NVME dries in my m.2 ports. I want to put them RAID 1 so I can weather a drive…
Evan Carroll
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RAID10 on SSD drives
I can't find information about using SSDs in RAID10. If I want to build RAID10, should I create RAID partition in 80% of total drive size on each drive?
Deniska80
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zfs performance: split controller across mirrors vs splitting a mirror across controllers?
Suppose I have
4 disks split into 2 zfs mirrored pairs
2 sata controllers, where each can take 2 disks
Obviously, better expected uptime will be achieved by splitting each controller across both mirrored pairs: so either controller can fail and…
mkk
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Connecting XRAID to Sunfire via LSI FC card - Drives not showing up
I've got a Sunfire T1000 machine ( Solaris 10 10/09 s10s_u8wos_08a SPARC ) with a LSI7404EP-LC fibre channel card in it. This is plugged into an XRAID.
The system seems to have picked up the card
> /usr/platform/`uname -i `/sbin/prtdiag
…
Matthew Watson
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ESXi 4.0u1 - backup/copy options
I have a machine built using ESXi 4.0u1 and it has 3 hard drives. I have my hosts built on different hard drives but wondering about backup options. I do not have RAID but I have 3 drives and 1 is totally empty. I had been using it to store ISOs for…
Hanadarko
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Disk pair not usable after moving from hardware RAID (Windows) to software RAID (Linux)
A long time ago I created a RAID1 pair from the boot menu of a JMicron JMB363 card. All was working fine under Windows and the RAID1 array was recognized as a single disk. I don't remember exactly how may partitions the disk had but for sure there…
Bemipefe
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Transferring RAID1 to a new motherboard after HDD failure, and no "Superblock" found
First an OS SDD failure followed by a mobo failure, new mobo/cpu/ram later, and I have a RAID1 with a single working disk, and I am trying to get it remounted so that I can add in a new replacement disk.
But to do that I need to assemble it using…
Aslan French
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4 answers
Hard-drive/memory configuration for a compile server?
I have a workstation that 3 people log into for compiling source code. Our project consists of about 1000 files and GCC compiles that to a ~200MB .elf file (with debug).
Our current workstation is an Intel Core 2 CPU X6800 @ 2.93GHz with 2…
user34327