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.
Questions tagged [raid6]
125 questions
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Expanding RAID6 with LVM
My question is a bit broader than the question title, but here is my situation: I have Synology Hybrid Raid (SHR) built on 2 x 2TB drives. I want to migrate to a software-RAID on a homegrown linux machine. My current plan is backup the SHR remotely,…
soundsofpolaris
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ZFS: 3 devices: what's the difference between mirror and raidz2?
It would seem like with 3 devices, it's possible to configure a ZFS pool with either mirror or raidz2 mode.
What's the difference in performance and reliability?
(In regards to reliability, I'm specifically interested in the topic of partial data…
cnst
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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 operation : Reconfiguration
…
user1559834
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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 one drive (sdi) which is constantly reading faster…
Peter
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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 hardware for 4 months already.
Every week however,…
Soonts
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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 < 1mb/sec for about 30-60 seconds.
Streaming HD…
zio
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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. I should be able to add a single 2TB disk to the…
Paul Hinett
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Adding a disk to an existing RAID fails with "disk doesn't have enough capacity"
I have a very old physical server using many disks in a number of RAID6 group. Those disks are not in the same chassis, instead is a JBOD system connected through the RAID controller on this server. In one of the RAID group, I had a disk failed.…
Heelara
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How is the HPE SSA "remove drives" command supposed to work to shrink an array?
I have an HPE ProLiant DL380 Gen9 Server with 15 internal 8TB SAS LFF drives, in a RAID6 configuration through an HP Smart Array P840ar controller. It contains a single 94.6 TB Logical Drive [Size: 94.6 TB / Used Space: 109.2 TB (100.0%)]
The…
interplanetary
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RAID6 failed instantly and switched to RAID0 - any chance to rescue?
I´m running a server ob Ubuntu 16.04. Data storage on this system uses a lvm on top of a software raid 6 whereas the os is installed on a separate raid 1 with lvm.
The raid 6 is built up of 7 partitions on 7 disks.
After a raising amount of…
grelog
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How to create degraded raid6 array using megacli
There is a server with few disks. And - a new server with PERC controller.
I would like to migrate existing data into a new server to raid6 which uses 6 disks(4+2).
Unfortunly - i don't have enought free disks to create a "target" raid6 array. I…
undefine
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Recovering an RAID6 using ddrescue. mdadm: failed to add, invalid argument
I had 3 drives fail in a matter of a week on a RAID6. Luckily, one drive seemed to be mostly fine. I was able to run ddrescue and it copied all but one small area (couldn't read 14MB out of 3TB).
However, when trying to assemble the array using…
Devon
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mdadm RAID6, recover 2 disk failure during reshape
I was reshaping my array from 10 disks to 11 to a degraded state (drive I want to add already has data on it, but nowhere to put it). 2 drives disconnected while it was running (power issue).
Is it still possible to recovery this array?
After power…
user294789
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mdadm RAID6 to RAID60
Is it easy to convert a RAID6 to a RAID60?
Right now, I have an 8-drive RAID6. I'm looking to upgrade to a 3U 16-bay system and thinking of having a 16-drive RAID60. Is it possible to move my drives over to the new system start the RAID6 and then…
Devon
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Strange performance issue with Dell R7610 and LSI 2208 RAID controller
Connecting controller to any of the three PCIe x16 slots yield choppy read performance around 750 MB/sec
Lowly PCIe x4 slot yields steady 1.2 GB/sec read
Given same files, same Windows Server 2008 R2 OS, same RAID6 24-disk Seagate ES.2 3TB array on…
GregC
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