How to create new empty journal?

How to create new empty journal?

[Fyodor Ustinov]

Hi!

I need to create new fresh journal for OSD server without removing data.
How?

WBR,
     Fyodor.

Re: How to create new empty journal?

[Wido den Hollander]

Hi,

On Thu, 2011-06-09 at 01:30 +0300, Fyodor Ustinov wrote:
> Hi!
> 
> I need to create new fresh journal for OSD server without removing data.
> How?

This can be done with:

$ cosd -i <osdnum> -c /etc/ceph/ceph.conf --mkjournal

This will reset your journal.

Why do you want to do this?

Wido 

> 
> WBR,
>      Fyodor.
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Re: How to create new empty journal?

[Fyodor Ustinov]

On 06/09/2011 01:09 PM, Wido den Hollander wrote:
> Hi,
>
> On Thu, 2011-06-09 at 01:30 +0300, Fyodor Ustinov wrote:
>> Hi!
>>
>> I need to create new fresh journal for OSD server without removing data.
>> How?
> This can be done with:
>
> $ cosd -i<osdnum>  -c /etc/ceph/ceph.conf --mkjournal
Thanx!

> This will reset your journal.
>
> Why do you want to do this?
>

Many cases:

1. I have journal on tempfs and want to stop ceph cluster and restart 
servers. After that I lose journal.

2. I want to increase journal size.

3. I want to decrease journal size.

4. I want replace journal device.

And so on.

WBR,
     Fyodor.

Re: How to create new empty journal?

[Gregory Farnum]

For all of these use cases you're going to want to flush the journal
to permanent store to make sure you don't lose any data.
1) Shut down the cosd.
2) Start it up again with the --flush-journal argument.
It will run in the foreground and flush out any data in the journal.
You're all set and can do whatever you want!
-Greg

On Thu, Jun 9, 2011 at 3:19 AM, Fyodor Ustinov <ufm@ufm.su> wrote:
> On 06/09/2011 01:09 PM, Wido den Hollander wrote:
>>
>> Hi,
>>
>> On Thu, 2011-06-09 at 01:30 +0300, Fyodor Ustinov wrote:
>>>
>>> Hi!
>>>
>>> I need to create new fresh journal for OSD server without removing data.
>>> How?
>>
>> This can be done with:
>>
>> $ cosd -i<osdnum>  -c /etc/ceph/ceph.conf --mkjournal
>
> Thanx!
>
>> This will reset your journal.
>>
>> Why do you want to do this?
>>
>
> Many cases:
>
> 1. I have journal on tempfs and want to stop ceph cluster and restart
> servers. After that I lose journal.
>
> 2. I want to increase journal size.
>
> 3. I want to decrease journal size.
>
> 4. I want replace journal device.
>
> And so on.
>
> WBR,
>    Fyodor.
> --
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
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Re: How to create new empty journal?

[Fyodor Ustinov]

On 06/09/2011 08:13 PM, Gregory Farnum wrote:
> For all of these use cases you're going to want to flush the journal
> to permanent store to make sure you don't lose any data.
> 1) Shut down the cosd.
> 2) Start it up again with the --flush-journal argument.
> It will run in the foreground and flush out any data in the journal.
> You're all set and can do whatever you want!
> -Greg
Thanx!

WBR,
     Fyodor.