[gpfsug-discuss] GPFS on ZFS! ... ?

[Laurence Horrocks-Barlow]

@JAB

Same here passing the same LVM LV's through to multiple KVM instances works a treat for testing.

-- Lauz

On 13 June 2016 22:05:20 EEST, Jonathan Buzzard <jonathan at buzzard.me.uk> wrote:
>On 13/06/16 18:53, Marc A Kaplan wrote:
>> How do you set the size of a ZFS file that is simulating a GPFS disk?
>>   How do "tell" GPFS about that?
>>
>> How efficient is this layering, compared to just giving GPFS direct
>> access to the same kind of LUNs that ZFS is using?
>>
>> Hmmm... to partially answer my question, I do something similar, but
>> strictly for testing non-performance critical GPFS functions.
>> On any file system one can:
>>
>>    dd if=/dev/zero of=/fakedisks/d3 count=1 bs=1M seek=3000  # create
>a
>> fake 3GB disk for GPFS
>>
>> Then use a GPFS nsd configuration record like this:
>>
>> %nsd: nsd=d3  device=/fakedisks/d3  usage=dataOnly pool=xtra
>>   servers=bog-xxx
>>
>> Which starts out as sparse and the filesystem will dynamically "grow"
>as
>> GPFS writes to it...
>>
>> But I have no idea how well this will work for a critical
>"production"
>> system...
>>
>
>For "testing" purposes I just create a logical volume and map it
>through 
>to my bunch of GPFS KVM instances as a disk. Works a treat and SSD's
>are 
>silly money these days so for testing performance is just fine. There 
>was a 960GB SanDisk on offer for 160GBP last month.
>
>JAB.
>
>-- 
>Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
>Fife, United Kingdom.
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-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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