Re: Raid 5 Array

[Marcus <nexuslite@gmail.com>]

Okay I have my raid extended to 1500.3GB however I can't seem to grow
the partition past 1TB. It will let me create a new partition but it
won't let me make the current partition any bigger. Does anyone know
how to fix this?

On Sat, Apr 2, 2011 at 5:22 PM, Marcus <nexuslite@gmail.com> wrote:
> Okay it seems to work now. I destroyed md0 and recreated it and then
> just added it to the md2 array without doing any partitioning like I
> did all the times before. Even when I created my old array I
> partitioned it but mdadm destroyed the partition automatically.
>
> On Sat, Apr 2, 2011 at 4:06 PM, Marcus <nexuslite@gmail.com> wrote:
>> I am running a raid 5 only. The raid 0 is to make a number of smaller
>> drives larger. Because a raid 5 takes the smallest drive and applies
>> it to all drives.
>>
>> The original raid started off as a 26GB raid 5 with a 13GB, 40GB and a
>> 160GB drive and I have grown it from there to its current size which
>> is 1TB.
>>
>> I bought another 1TB drive yesterday and am trying to combine a 500GB
>> and a 250GB drive to make a 750GB drive so I can push the raid up
>> again this time to 1.5TB.
>>
>> The last configuration was a raid0 md0 320GB (160GB, 160GB), raid 0
>> md1 570GB (md0, 250GB), raid 5 1TB (md1, 500GB, 1.0TB) which has been
>> extremely stable for the last 3 months but ran out of space.
>>
>> The configuration I am trying to achieve is raid0 md0 750GB (250GB,
>> 500GB) , raid 5 md2 1.5TB (md0, 1.0TB, 1.0TB)
>>
>> This started out as an experiment to see if I could do a raid 5
>> system. It was originally built with drives I had laying around the
>> house. Now it is big enough that I have started buying drives for it.
>> I have gone through many configurations of extra drives to get it
>> where it is now. I have had 1 catastrophic failure since I started and
>> that was the last time I made it bigger. I was running on 2 drives one
>> of them being the md0, md1 configuration and mdadm got confused and
>> couldn't put md0 and md1 back together to have 2 working drives. I
>> probably could have corrected the problem if I knew what I know now
>> but as this is an experimental raid it is a learning process.
>>
>> The current problem I am having is every time I try to apply the 750GB
>> raid drive to the raid 5 it corrupts the headers and 1 of the arrays
>> report the wrong size. Which causes it not to mount. The only way to
>> correct the problem seems to be to unplug the two drives that make up
>> md0 and reboot onto 2 drives then start the process again. I am
>> currently working on my 3rd attempt to integrate the 750GB raid drive.
>> Each attempt takes 4 hours to restore the drive so it has been a long
>> process. I haven't lost the data yet though so I guess I will keep
>> trying. Hopefully it won't be too corrupt when I am done.
>>
>>
>>
>> On Sat, Apr 2, 2011 at 3:04 PM, Roberto Spadim <roberto@spadim.com.br> wrote:
>>> why use raid 5,6? raid1 isn´t more secure?
>>>
>>> 2011/4/2 Roman Mamedov <rm@romanrm.ru>:
>>>> On Sat, 2 Apr 2011 22:45:58 +0100
>>>> Simon Mcnair <simonmcnair@gmail.com> wrote:
>>>>
>>>>> One last thing.... I've never heard of anyone using a raid 05. Why
>>>>> wouldn't you use a RAID50 ?  Please can you dish the dirt on what
>>>>> benefit there is ? (I would have thought a raid50 would have been
>>>>> better with no disadvantages ?). I thought that raid10 & 50 were the
>>>>> main ones in use in 'the industry'.
>>>>
>>>> RAID5/6 with some RAID0 (or JBOD) members is what you use when you want to
>>>> include differently-sized devices into the array:
>>>> http://louwrentius.com/blog/2008/08/building-a-raid-6-array-of-mixed-drives/
>>>> --
>>>> With respect,
>>>> Roman
>>>>
>>>
>>>
>>>
>>> --
>>> Roberto Spadim
>>> Spadim Technology / SPAEmpresarial
>>>
>>
>
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