[DRBD-user] Re: system freezes with drbd 0.7.21 on kernel 2.6.18

Joachim Rieger joachim.rieger at agimatec.de
Tue Feb 5 15:46:47 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.


Hello list,

ok, now I setup lvm over drbd and dumped the domU's to lv and this works
much better and much more stable than file-based VBDs (with domU as loop
.img)
So finally I can say 'don't put Xen domU als file-based VBSs (loop-FS/
.img) on a drbd-device, use lvm over drbd instead and create a lv for
each domU' (if you have intensive disk i/o)

So, I'd like to close this thread, because my problem is solved!

Thank you for all the suggestion and hints!
Joachim


> Hello Hans-Joachim,
>
> thank you for your answer, but now I try to put a LVM over drbd and make
> a lv for each domU
> and I just leave the file-based VBD solution. Hope this will work.
>
> regards
> Joachim
>
>   
>> Hi,
>>
>>   
>>     
>>> meanwhile I upgraded the kernel and drbd to 8.2.4 but the problem still
>>> exists.
>>> I read your docu on pro-linux and read that you also had problems with
>>> Xen VBDs (_file:_ xyz.img),
>>> so I think about if I should make LVM over drbd and create a lv for each
>>> domU or if I should try to bring the tap:aio functionality into Xen and
>>> the kernel, but you did not have good experience with this tap:aio, did
>>> you ?
>>>     
>>>       
>> right, it was desastrous. Maybe newer Xen does better, but I didn't
>> follow the Xen development.
>>
>>   
>>     
>>> Can you recommed KVM, is there a docu how you switched from Xen to KVM ?
>>>     
>>>       
>> I certainly have do do more tests, but currently it runs reliably.
>> It performs a ittle slower as Xen, at least on file operations.
>> The documentation is in preparation. Basically I created a new VM
>> on KVM, booted a rescue disk and rsync'ed the contents of the old VM into
>> the new one. With my largest VM with 300 GB this took a while.
>> You must not use the default network driver (ne2000) in KVM which
>> is broken.
>>
>> Regards,
>> hjb
>>   
>>     
>
>
>   


-- 
--- 
Joachim Rieger

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