[DRBD-user] Best way to use LVM with drbd

Rudi Ahlers Rudi at SoftDux.com
Fri Feb 15 14:31:52 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.



Bas van Schaik wrote:
> Rudi Ahlers wrote:
>   
>> Lars Ellenberg wrote:
>>     
>>> (...) 
>>>       
>> Ok, so just to understand this. Let's say I want to setup RAID + LVM +
>> DRBD, with the option of growing the whole storage with minimal fuss,
>> do you recommend the following?
>>
>> 4x 250GB HDD's setup as RAID 5 (1x spare), with LVM on top of that,
>> and DRBD on top of the LVM? And then, I can just replace the 250GB
>> HDD's one-by-one, and increase the LVM ?
>>     
> I don't exactly what you mean with "I can just replace the 250GB HDD's
> one-by-one", but I do know that setting up 4 of 5 hard drives in RAID5
> is everything but optimal. Why not use RAID6? It provides (5-2) * 250 =
> 750 GB of usable storage and uses 2 * 250 = 500 GB for redundancy
> purposes, which is exactly what you will achieve when using RAID5 over 4
> disks and one spare disk. The obvious advantage is that you can have two
> failures with RAID6, where your RAID5 setup with the spare disk can only
> cope with one failure at a time.
>
>   -- Bas
> _______________________________________________
>   


hehe, I meant replace the 1st drive, and let it resync with the RAID 
array, then the 2nd, and 3rd, and then the 4th drive :)

The reason for only 4 HDD's is cause I have a 2U case with space for 
only 4HDD's :( And I pay for U for hosting, so 2U is half the price 
cheaper of 4U

Kind Regards
Rudi Ahlers
CEO, SoftDux
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