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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10answers
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Which is better: RAID5 + 1 Hotspare / RAID6?
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?
9
votes
2answers
564 views
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 ...
6
votes
2answers
2k views
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 ...
5
votes
2answers
1k 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 ...
5
votes
2answers
644 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 ...
4
votes
1answer
1k 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 ...
4
votes
1answer
294 views
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 ...
4
votes
1answer
63 views
Linux mdadm --grow RAID6: Something wrong - reshape aborted
I have a RAID60 that I want to expand.
The current is: 2 axles each having 9 disks + 2 spares.
The future is: 4 axles each having 10 disks + 1 spare.
So I need to do some --grow to reshape the ...
3
votes
3answers
406 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 ...
3
votes
2answers
663 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 ...
3
votes
1answer
173 views
RAID-5 or RAID-6 - is RAID-5 really that bad? [duplicate]
Possible Duplicate:
Which is better: RAID5 + 1 Hotspare / RAID6?
I need to decide myself between RAID5 and RAID6.
The servers have a hardware-RAID controller and 6 drives each.
The ...
3
votes
1answer
164 views
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 ...
2
votes
4answers
323 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 ...
2
votes
2answers
223 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 ...
2
votes
1answer
129 views
Abort raid6 expansion on Adaptec 52445 SATA RAID?
I am expanding my raid6 array from 18x2Tb to 20x2Tb disks and after 3 weeks status shows:
Logical device Task:
Logical device : 0
Task ID : 105
Current ...
1
vote
5answers
493 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. ...
1
vote
3answers
1k views
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 ...
1
vote
1answer
330 views
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 ...
1
vote
2answers
874 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 ...
1
vote
3answers
707 views
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 ...
1
vote
0answers
42 views
Online expansion PERC700 RAID6 server
I have a Dell PowerEdge r510, with 5 HDDs in a RAID6 configuration. I'd like to add a 6th disk (and, in the future, more) to grow the hardware RAID configuration. I have a logical volume, in which ...
0
votes
1answer
186 views
3ware raid controller, unit unusable, several degraded disks
I was switching the disk drives in my server, running RAID 6 on 5 disks on a 3ware 9650SE controller, for newer disks and have run into a problem.
The two first disks went fine, I took out one disk ...
0
votes
2answers
309 views
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 ...
0
votes
2answers
366 views
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 ...
0
votes
1answer
26 views
Disabling Server 2003 Wonderware App Server Page File on VMware
There are so many threads on whether you should mess with the page file or not. This scenario describes a unique circumstance that is real world in my production enviornment. The conclusion I've ...
0
votes
1answer
485 views
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 ...
0
votes
1answer
2k 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 ...
0
votes
1answer
215 views
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, ...
0
votes
0answers
373 views
Rebuilt md raid 6 array now showing xfs errors. How bad is it?
We had a storage server with performance starting to be poor. When I installed Linux's smartutils, it found
Device: /dev/sdm, 2 Offline uncorrectable sectors
Since this was a rather large raid6 ...
-1
votes
7answers
516 views
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 ...
-1
votes
1answer
251 views
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 ...
-2
votes
2answers
733 views
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 ...
