HAST initial sync speed

[Thomas Steen Rasmussen]

On 06-08-2010 15:50, Pawel Jakub Dawidek wrote:
> On Tue, Aug 03, 2010 at 11:31:58AM +0200, Thomas Rasmussen wrote:
>    
>> Hello list,
>>
>> I finally got my ZFS/HAST setup up and running, or trying to at least.
>> I am wondering how fast the initial HAST sync normally is - I created
>> these 4 HAST providers yesterday on 4 146 gig drives, and they still each
>> have over 90 gigabytes 'dirty' today. The machines are powerful (dell
>> r710) and are otherwise idle, and they are connected to the same gigabit
>> switch.
>>
>> I can supply details about any part of the configuration if needed, but I
>> just wanted to ask if you guys believe something is wrong here. I can't help
>> but think, if the initial sync takes 24+ hours, then if I ever need to
>> replace one of the servers, I will be without redundancy until the new
>> server reaches 0 'dirty' bytes, correct ?
>>      
> Correct, but synchronizartion should take much, much less time.
> Is dirty count actually decreasing?
>
>    
Hello,

Yes it was decreasing steadily but very slowly. It finished between 
thursday
evening and friday morning, and the dirty count is now 0. All in all it 
took over
72 hours. It was transferring around 20mbits while doing this. However, 
if I
copied a large file to the primary HAST node, it would use up a lot more
bandwidth. It is like HAST was synchronizing the "empty space" with lower
priority or something. Does that make any sense ? The servers are not in
production so I can perform any testing needed. Thank you for your reply.

Regards

Thomas Steen Rasmussen