Questions tagged [raid]
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.
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ESXi sees RAID1 as two hard drives
The server is Proliant ML330 G6. I've activated the embeded SATA RAID in BIOS. Created 1 logical drive in "Option Rom Configuration for Arrays" in RAID 0+1 that consists of two 1TB drives. So in other ...
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Which RAID to use for 8 hard drives? [closed]
I have 8 idendical hard drives and I want to know which RAID levels or level combinations I should use to achieve maximum performancefor random reverse reading.
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SW ZFS vs. HW RAID controller
I run a FreeBSD 10.1-RELEASE webserver, and I have 2 sata HDD on a HW RAID1 controller, but when I installed the OS, it won't do it on a ZFS filesystem (for mirroring as I intended to) but I was ...
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Does hardware RAID1 offer significant advantages to S/W RAID in a computer cluster that's highly redundant?
I'm about to set up a Linux cluster of 5 physical server nodes (more nodes to be added later, probably).
the cluster will be managed by Proxmox (and yes, it works in software RAID)
shared storage ...
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LVM2: pvscan with offset?
After I played with mdadm a bit too hard, I'm now tryng to recover my lvm2 volumes that were sitting in the original RAID1 array. pvscan finds nothing, but that's not a surprise: since mdadm is not ...
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Rebuild the Software RAID Array after a Drive Replacement
I had a disk failure on my dedicated server with 1and1. They have sent me this guide.
http://help.1and1.co.uk/servers-c40665/dedicated-server-linux-c40577/rescue-and-recovery-c40581/rebuild-the-...
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How does LSI MegaRAID actually lay out RAID10 sets?
I'm trying to set up a RAID10 set on an LSI MegaRAID controller. It is unclear to me how the RAID controller will actually lay out the RAID set on the physical drives.
Part of the problem is that ...
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RAID 1 failed disk replacement - backup recommendations [closed]
Having recently lost one drive in a RAID1 (mirrored) setup with a "hot spare" on a HP ProLiant ML350 G6 server, we're about to have it replaced with a new one. The disks are hot swappable so for that ...
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Problems with DL380 Gen9 Smart Array
I recently bought a ProLiant DL380 Gen9, i've had some trouble getting it up and running...I ran the ProLiant SPP ISO to uprade firmwares but felt the system became less stable as a result, at one ...
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Ubuntu installation can't detect hard drives
I'm installing Ubuntu onto a HP Proliant DL360 G7 server, which has a hardware Smart Array RAID controller that is not compatible with Ubuntu.
HP say the RAID controller needs to be disabled in the ...
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Centralized LSI RAID controller management
In an organization where the hardware maintenance team is separated from the OS platform and operations team, 3Ware's RAID controllers have been in use together with the 3DM2 web service opened up to ...
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"No inittab file found" after reset
An old dedicated server (Debian with Raid1) wasn't responding today and now can't boot after manual reset. Last message is
No inittab file found.
I still have access to filesystem via rescue ...
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4TB HGST Ultrastar 7K4000 shows as 2 TB with Dell PERC 6/i RAID controller
I just got 2 x HGST Ultrastar 7K4000 4 TB drives, for creating a RAID 1 array in a Dell Poweredge 2950 server with a PERC 6/i RAID controller.
According to a Compatibility Summary from HGST, the ...
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ZFS - zpool replace never finishes
I have a 5 x 3TB raidz1 array on a ubuntu 14.04.1 server. Last month, one of the drives died (audible clicking). I was able to replace the drive with zpool replace RAID <dead drive> <new ...
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How to identify failed drive/port on 3ware card
I have a 3ware 9650-SE controller with 2 drives in RAID-1 configuration. The drive on "port 1" has an error but the drive cages aren't labeled. I tried using the cli to "identify" the drive but tw_cli ...
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3disk in raid 1 using half/half
Im using a mdadm software raid system on my new server which runs 3x120GB ssd drives.
Currently, this is the preinstalled configuration that came with the server
cat /proc/mdstat
Personalities : [...
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Server raid doesn't boot in the morning
We have a HP Proliant ML350 G6 with integrated sas raid controller. Since 3 days the server starts up in the morning without this raid. All othe HDDs / SDDs are ok.
We did install the ServicePack ...
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Can I recover my raid after blown backplane / mobo?
We had a catastrophic server failure the other day. The server was the head to our NAS. Multiple disk shelves were attached via SAS (SFF-8088 to a HP Smart Array RAID Card). Also connected to the RAID ...
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connecting HP gen 5 SAS raid cage to a third party (3ware, LSI) controller?
I have a ML350 G5 that I'm thinking of repurposing to save money. I'm looking to install FreeNAS but it (ZFS) doesn't play nice with the HP e200i card that's part of the motherboard from what I've ...
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How do I connect 16 SATA-drives to one Adaptec ASR-6805 KIT? (2 SFF-8087 Internal Ports) [duplicate]
Kit includes only 2 cords SFF-8087 to 4xSATA... Sum is 8. I need 16. What should I do? No way to change the controller. But can buy additional cards or wires if needed. Please advise.
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Cannot see all disks on Solaris 10 using on a Dell Perc5i Dual Channel Raid Controller
I have a Dell PowerEdge 2950 running Solaris 10 with 8 drives. I want to swap some of the drives out for new ones. My issue as of right now is that I only see half of them and there does not appear ...
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Data Transfer Speed Hardware Config
First off, I am sorry if this gets a little scattered, it encompasses a large problem for me I have been dealing with for some time.
Here is a little background: I operate an educational website ...
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Move PERC5I and RAID Array from Gen 2 to Gen 3 2950
I have two 2950 servers, one Gen 2 and one Gen 3. The Gen 2 server has a failed motherboard DT021, and a lot of important data. The Gen 3 box is currently unused. It has a DP246 motherboard.
My ...
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Mounting device from degraded RAID 1
I am trying to mount device form raid 1 (created on other device), because I need to copy data from this disk. When I am trying to assemble new array i get a message:
foo@bar# mdadm -A -R -v /dev/...
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RAID rebuilding seems to have stopped
My server was running a RAID 1 array with two disks. One of those disk failed today and was replaced.
I've copied the GPT partition to the new hard disk (sda) with:
sgdisk -R /dev/sda /dev/sdb
...
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Would this RAID 5 solution work?
I have a question about RAID 5 rebuilding.
Let's assume the following: A RAID 5, 3 disk (5TB each) array (i.e. 10TB useable).
If a disk fails, the data remains accessible (e.g. employees could ...
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Abstract physical drives to create a resizable raid array: is it possible?
I want to set up two hard drives with a portion of them set in raid1. I want that portion to be scalable too, as logical LVM volumes are. Is it possible to abstract physical volumes or to create an ...
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How can I force soft raid to read only from one disk?
I have quite a large IO wait showing in top. I suspect this is fault of SDA drive (on of 2 disks in RAID array), which was replaced about week ago. There are no errors visible, smart showing nothing, ...
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RAID 10: Does it impact performance if I have 24 small drives in Raid10 vs. 4 larger drives?
Does it impact performance if I have 24 small drives in Raid10 vs. 4 larger drives?
The root of the question is does it have any performance or redundancy benefit if I fill out all 24 of my bays with ...
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added new drives to raid 5 with wrong format then removed them and broke raid 5
thanks in advance for any help.
In summary: I added 3 new disks to raid 5 array. Then, thinking they were not added, I removed them. Now the array doesnt work. What can I do to get back the array?...
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Windows Tool to read S.M.A.R.T. attributes on SATA drive in HP D2700 Enclosure using P812 Controller
I've got two HP DL380 G7 servers + P812 controller + D2700 enclosure. They're database servers with 144 Gb RAM. P812 firmware is 6.40, D2700 is at 0147
They both worked great with 18 OWC Mercury ...
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Would software RAID0'ing SSDs help or hinder maximization of useful CPU work throughput?
My question is in the title... here is some background:
[OS is Linux.]
[UPDATE: The contents of this RAID0 is redundant (sync'd from SCM). I am not worried about the increased risk of data loss.]
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LSI Megaraid alarm - clearing hotspare
I have several Supermicro servers with LSI Megaraid controllers, 9266-8i. One recently lost a drive; I replaced it as usual, but it is still beeping on reboot. It is set up as RAID 10 + hotspare.
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Increasing the size of a 3ware 9650SE RAID5
These questions seemed similar, but they did not worK:
Why is the 9650SE RAID1 not showing the full size of the disks?
How can I increase the size of a RAID 1 array from 750GB to 1TB? 3ware
Here is ...
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Remote system's filesystem disappeared after "mdadm --grow 2 /dev/md0"?
Yesterday, I added a second 500GB hard drive to a system. This system was installed as a RAID-1 system with only one drive, because I didnt have the other one on hand.
After finally adding the second ...
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How do I list which drives are part of each RAID array?
I have a linux software RAID using md. I want to list all of my RAID arrays and each hard drive attached to them. Is there an easy way to do that?
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Can't mount raid 1 with different size disks
I have a EC2 instance with a an ssd on xvdm (20 gb, 60 iops) and another ssd on xvdb (16 gb, better iops - instance store). The xvdm contains a mysql database and I'm trying to join these 2 disks in a ...
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Reusing a drive from an array
I read the question here Reusing Raid 5 Drive? but I'm not sure it applies 100% to my situation.
What is the standard practice when removing a drive from an array to use as a spare for another array? ...
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HP P420i SSD RAID Configuration
I've been testing a HP DL380p with 16x SSDs in a RAID5 on the P420i controller with 2GB FBWC that is integrated on the board. Quite good performance, but not good enough.
When I simulate the IO ...
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Ubuntu VS Windows partitioning, 2TB limit
I have a server with a 3ware 9690sa-i8 raid card installed. I have configured a raid with a size of 12TB which i would like to use for Windows. It seems whenever the partition table is MSDOS the limit ...
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Adding additional disks to HP P2000 SAS Storage
We have a 12 bay HP P2000 SAS Enclosure with 6 drives on RAID 5 installed. The drives are configured as 2 separate DataStores for a VMWare vSphere ESXi setup.
Now we want to add:
6 additional ...
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Software RAID 10 not any faster than s/w RAID 5 on Ubuntu 14.04 box, why?
We are doing some tests on a new database server with 4 x 240 GB SSD disks. From what I have read RAID 10 should be faster than RAID 5 with the same "one-disk loss ok" redundancy.
However when ...
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Create an MBR on secondary plex
I have a HP Proliant ML350 g6 server running windows 2008 std R2. This server had two hardware arrays in it. One array was a raid 0 with 1 physical drive running raid 0. The other array is 5 physical ...
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Improve read performance on ext4 on Centos with software raid1? [duplicate]
I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions:
# df -h
Filesystem Size Used Avail Use% ...
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Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens?
Is a BBU necessary when you have A+B power?
Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens and you are forced to do a cold reset?
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3ware 97504i - Disk mappings/UUIDs change on reboot
I have a 3ware 9750-4i with 36 drives running (4 in RAID 10, rest individual drives, i.e JBOD).
When I reboot, all the drives except for the RAID 10 array, have their UUIDs changed on reboot (it ...
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How to clone a RAID5 system
I clone single disk systems by booting the master system to a CD and running…
dd if=/dev/sda | gzip - | ssh user@hostname dd of=image.gz
Then I boot the target system with the CD and run…
ssh user@...
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QNAP ts-1679u-rp RAID 6 rebuild with wrong order
I have a qnap ts-1679u-rp running on RAID 6.
It has 2 disk error. Therefore, I replaced the 2 disk (Disk 3 and Disk 13) with new disk of the same model and capacity.
It failed to rebuild.
1. I tried ...
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When does a Raid restore redundancy after a broken sector is flagged as defective?
What happens when I flag a sector on a hdd in a RAID setup as `defective (GLIST) ?
Will the data be written to the replacement sector right away or does this depend on the actual setup/settings (...
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Combine 2 logical raid 0 drives to 1 logical raid 1 drive
I have an HP Proliant server with an P410i embedded array controller.
The server was originally setup with 6 physical drives with the OS on 1 logical drive with a raid 0 and 5 physical drives setup ...
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