Questions tagged [raid6]

RAID6 is a method of configuring fault-tolerant hard drive storage. It is similar to RAID5, but differs in that it writes two sets of parity information, thus can survive the simultaneous failure of two hard drives.

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Linux software RAID6: 3 drives offline - how to force online?

This is similar to 3 drives fell out of Raid6 mdadm - rebuilding? except that it is not due to a failing cable. Instead the 3rd drive fell offline during rebuild of another drive. The drive failed ...
Ole Tange's user avatar
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mdadm: superblock on /dev/sdd1 doesn't match others - assembly aborted

OS: Debian Squeeze Kernel: 2.6.32-5-amd64 mdadm version: 3.1.4 (31 August 2010) mdarrays md1 = raid1 (this is working) (devices: /dev/sd[fg]1) md0 = raid6 (previously raid5, ...
Waxhead's user avatar
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7 answers
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Which RAID/LVM configuration for new 2x8TB file server is safest?

I just built a totally new PC to be a fileserver. It has one 60gb SSD for OS (ubuntu 12.04), and 8 2tb data drives in it. I am looking for the safest, most stable way to set up a single giant ...
user1169420's user avatar
5 votes
1 answer
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3 drives fell out of Raid6 mdadm - rebuilding?

i had an mdadm raid6 array with 13x1TB drives. Within 10 minutes 3 of these drives fell out of the array... we assume bad cable to the controller card and replaced, however now we need to get the ...
pironic's user avatar
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2 answers
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High IO latency on ESXi 4.1 on HP DL580 G7

at my Company we were experiencing some weird spikes on IO latency on one of our ESXi instances. we've spend 24h figuring out whats wrong and no clue so far. after giving up we put all the disks ...
teddydestodes's user avatar
6 votes
1 answer
8k views

3Ware 9650SE RAID-6, two degraded drives, one ECC, rebuild stuck

This morning I came in the office to discover that two of the drives on a RAID-6, 3ware 9650SE controller were marked as degraded and it was rebuilding the array. After getting to about 4%, it got ...
cswingle's user avatar
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7 votes
2 answers
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Convert a Smart Array RAID5 array to a RAID6 (ADG) variant

I have an HP MicroServer (N36L) with a SmartArray P410 controller, a 512MB BBWC unit and four (4) 2TB disks connected. Three of those disks are configured as a single RAID5 array and one is left alone....
pjsawicki's user avatar
16 votes
4 answers
7k views

Linux mdadm software RAID 6 - does it support bit corruption recovery?

Wikipedia says "RAID 2 is the only standard RAID level, other than some implementations of RAID 6, which can automatically recover accurate data from single-bit corruption in data." Does anyone know ...
sa289's user avatar
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-1 votes
1 answer
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3ware 9650SE-24M8 INOPERABLE data recovery

I have a raid6 array with 16 hdds. Two harddrives had failed (device error), but when I went to replace them, I pulled out one wrong disk! Now the raid array is INOPERABLE. Is there any way to ...
Jon Skarpeteig's user avatar
2 votes
5 answers
3k views

Which disk is bad in raid6 array

Server: Ubuntu Lucid RAID controller: Adaptec 3805 8 disks in RAID6 on HP Proliant DL180 G5 Hardware My kern.log tells me that I have an error on sdb, as shown below: [2740390.344436] sd 4:0:1:0: [...
sixnumber's user avatar
10 votes
2 answers
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Areca 1280ml RAID6 volume set failed

Today we hit some kind of worst case scenario and are open to any kind of good ideas. Here is our problem: We are using several dedicated storage servers to host our virtual machines. Before I ...
Richard's user avatar
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13 votes
4 answers
11k views

Convert linux software raid from raid5 to raid6

I currently have a file server with 3 1.5TB disks in a RAID5 array. Since it's pretty much full, I got three additional disks (also 1.5TB each). Now I'd like to switch to RAID6 since 6TB space is ...
ThiefMaster's user avatar
9 votes
3 answers
2k views

Is it safe to write data to a RAID 6 while it's rebuilding?

I have a test RAID controller on my network which hosts a very large RAID 6 (11 drives, 3TB each). One of the drives failed, and the array is now rebuilding. At this rate, I think it will take about 3 ...
Phil's user avatar
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3 votes
1 answer
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mdadm raid6 recovery reads more from one drive?

I just replaced a fault drive in my raid6-array (consisting of 8 drives) during the recovery I did notice something strange in iostat. All drives are getting the same speeds (as expected) except for ...
Peter's user avatar
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HP Storageworks MSA60, one failed disk replaced, all 12 bays flashing rapidly

I replaced a faulty disk yesterday afternoon, and the rebuild process started (RAID6). All disks were previously 750GB, but the only disk I could get is 1TB. Right now, almost 18 hours after replacing ...
skilleras's user avatar
1 vote
1 answer
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esx4 vmfs3 raid rebuild

I have a ESX 4.1 Server with a storage on RAID 60. After the rebuilding of the RAID the vmdk-files are not working in my VM. On starting VM I have this error: Cannot open the disk '/vmfs/volumes/...
fatumator's user avatar
3 votes
2 answers
23k views

LSI MegaRaid warning: Patrol Read can't be started

We run a HyperV server on RAID-6 (the OS is Windows Server 2008 R2). The hardware is LSI MegaRaid SAS 8704EM2 controller, with 4x 1TB WesternDigital SATA drives. The server is up & running on this ...
Soonts's user avatar
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2 votes
2 answers
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PERC 6i / RAID 6 failures

I've got a new server that I'm trying to install a RAID6 config on with a PERC 6i controller and 6 cabled drives. I installed the card, battery and cabled the drives and all looked fine. I installed ...
DKNUCKLES's user avatar
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How to identify RAID (5 or 6) controllers that allow dynamic resize of the array

I'm building a server with a RAID5 array, based on a hardware controller. I want to be able to later add additional disks and have the array rebalance across all of the disks, enlarging the usable ...
David Pfeffer's user avatar
3 votes
2 answers
1k views

How to diagnose intermittently slow raid data transfer rate?

I have an encrypted RAID6 set up on Centos 5.5. When I transfer a large 10gb file from the raid to my computer it will pause at around 4-5gb and again at 9gb. The data transfer drops from 25mb/sec to &...
zio's user avatar
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3 votes
2 answers
12k views

RAID6 setup - adding additional drives

I want to setup a dedicated server. To begin with we need a minimum of 8TB. I believe I can begin with 6x2TB drives in a RAID6 setup to achieve this. Now when I need to increase this capacity to 10TB....
Paul Hinett's user avatar
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mdadm & raid6: does "re-create(with different chunk size) + resync" destroy orig. data?

I would like to rescue data on my software raid-6 array. I did some stupid actions (described bellow) with this original array. Main Question: I need to know if original data stored on raid-6 array ...
schanhorst's user avatar
2 votes
4 answers
736 views

Which RAID format is best for data privacy during RMA?

So there are several RAID configurations to chose from, and I was wondering, eventually I expect some 25-45% of my drives may need to get swapped for a warranty repair. I know that there is no hope ...
Robert Rolnik's user avatar
1 vote
5 answers
2k views

RAID 6 to RAID 1 with mdadm

My home network is changing and I am moving my file storage solution away from my Ubuntu server and onto a Drobo FS. I currently have 6 500GB hard drives in a RAID 6 array providing 2TB of capacity. ...
Marcus Whybrow's user avatar
9 votes
4 answers
72k views

Minimum number of disks to implement RAID6

RAID6 is intended to provide fault tolerance in the event 2 disks fail. What is the minimum number of disks required to implement RAID6? thanks
Upul's user avatar
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3 answers
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RAID Virtual Disk Configuration / Partitioning in Operating System?

I have 6 x 1TB SAS for my new server. I want to create 3 partitions: one for OS, one for Virtual Machines, one for share data. There are 2 options for me: Option A: Create 3 Virtual Disks in RAID ...
Raptor's user avatar
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47 votes
10 answers
154k views

Which is better: RAID5 + 1 Hotspare / RAID6? [closed]

Just curious, I have 6 x 1TB 7200RPM Near Line SAS for my new server. I can either configure it as RAID5+1 Hot Spare or RAID6. What should I choose?
Raptor's user avatar
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3 votes
2 answers
291 views

Remove second RAID6 drive during resync from first failure?

I have a RAID6 comprised of five 1TB drives in good working order. I'd like to redistribute the array differently in my system (change the drive distribution over controller cards). I pulled the first ...
Tim's user avatar
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