[mythtv-users] Reassemble RAID with mdadm
Brent Bolin
brent.bolin at gmail.com
Tue Mar 16 19:04:13 UTC 2010
On Tue, Mar 16, 2010 at 12:03 PM, MarcT <myrdhn at gmail.com> wrote:
> Steve,
>
> Here is the current status of my raid -
>
> mdadm -D /dev/md0
> /dev/md0:
> Version : 00.90
> Creation Time : Mon Dec 14 19:17:08 2009
> Raid Level : raid1
> Array Size : 976759936 (931.51 GiB 1000.20 GB)
> Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
> Raid Devices : 2
> Total Devices : 2
> Preferred Minor : 0
> Persistence : Superblock is persistent
>
> Update Time : Tue Mar 16 09:00:38 2010
> State : clean
> Active Devices : 2
> Working Devices : 2
> Failed Devices : 0
> Spare Devices : 0
>
> UUID : d376cfd0:a438be3c:5f1e94b5:d63edfe3 (local to host myth)
> Events : 0.283797
>
> Number Major Minor RaidDevice State
> 0 8 17 0 active sync /dev/sdb1
> 1 8 33 1 active sync /dev/sdc1
>
> So if the status ever changes to degraded(not sure what it would
> change to if bad sectors etc...) could I simply bring the box down and
> replace with another drive? I don't have any spares defined trying to
> keep power usage as low as possible.
>
> Or is there an added set of commands to run when the bad drive is replaced?
> _______________________________________________
>
> Mirroring is fine for fault tolerance, but you get no speed boost from it.
> I would recommend getting 2 more drives if you can afford it and setup a
> RAID5 configuration.
> Not only do you get a fault tolerant array, can lose 1 drive and not lose
> data, but you get a speed boost because the system writes data across all
> the drives.
>
> MarcT
>
>
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>
Believe you can do a raid5 configuration with 3 drives. However
generating the parity bit slows things down on the write.
With 4 drives you would be better using RAID 0+1
Currently see no bottleneck using raid1. That's recording 4 HD
channels at a time. Flagging set for medium using 2 instances. And
often times running a single Handbrake rip.
Never really did get an answer to my question. But from a little
googling looks like a failing drive would need to be removed. And
then a replacement drive added.
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