[dm-devel] Problem when creating snashots

[The MoonSeeker]

Where can I find this patch? I'd like to test it..

Le 27 sept. 06 à 12:36, Milan Broz a écrit :

> The problem with limited number of snapshots is caused by the using
> big common mempool in dm-io module.
> (This can happen even you have a lot of free memory...)
>
> There are new dm-io patches which introduce new dm-io interface
> (using private mempools) and solving this type of snapshot limitation.
>
> Patches are currently in review and will probably change a bit,
> but I hope it will in 2.6.19 kernel.
>
> Milan
>
> --
> mbroz at redhat.com
>
> The MoonSeeker napsal(a):
>> Yes I really need it. I have to create a virtual network editor  
>> for my
>> diploma project. So I have found many virtual solutions but the  
>> bestest
>> for our project is OpenVZ. Unfortunatly, OpenVZ don't offer the  
>> copy on
>> write with his solution, after many tests, I have found a solution  
>> based
>> on LVM.
>>
>> The main idea is to have a Virtual Private Server Core and lot of
>> Virtual Private Server who are a snapshot of the Virtual Server Core.
>> Now the problem is the limitation of VLM, I need more than 32 servers
>> (32 snapshots). Will this limitation incresed in futur futur  
>> released of
>> LVM? Or can we broke this limitation?
>>
>> Have you a solution, it's relly urgent for me...
>>
>> Thanks you
>>
>>
>> Le 26 sept. 06 à 23:14, Jan Blunck a écrit :
>>
>>> On Tue, Sep 26, The MoonSeeker wrote:
>>>
>>>> I'd like to create many snaphot of an image but I've got when I
>>>> attemp to create the 32th snapshot :
>>>>
>>>> root at B03:/diplome# lvcreate -s -L150M -n 232 /dev/openvz/vps-core
>>>>   Rounding up size to full physical extent 152.00 MB
>>>>   device-mapper: reload ioctl failed: Ne peut allouer de la mémoire
>>>>   Failed to suspend origin vps-core
>>>>
>>>> I don't understand the error..
>>>
>>> I'm not a native french speaker (hint!) but I assume you run out of
>>> memory.
>>>
>>> Yes there are limitations to the number of snapshots. For every  
>>> single
>>> snapshot we have to allocate memory for copying the chunks to the
>>> exception
>>> store.
>>>
>>> Do you really need that many snapshots at the same time?
>>>
>>> -- 
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>>> dm-devel at redhat.com
>>> https://www.redhat.com/mailman/listinfo/dm-devel
>>
>>
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>
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