Hi, Greg,
When I went through the Ceph document, I could find the description
about /etc/init.d only, so it is still the easiest for me.
Is there documentation on other (upstart?) system or do I need to
learn those system ? Or just letting me know how to install the
resource file (for Ceph in upstart) might work for me.
Thanks.
regards,
Yasu
From: Gregory Farnum <greg@xxxxxxxxxxx>
Subject: Re: Question about configuration
Date: Thu, 10 Jan 2013 16:43:59 -0800
Message-ID: <CAPYLRzhZr81ko3QgC1oGXs_12-C6z-EVmuf3k47Ej3j8P_T0AA@xxxxxxxxxxxxxx>
> On Thu, Jan 10, 2013 at 4:39 PM, Yasuhiro Ohara <yasu@xxxxxxxxxxxx> wrote:
>>
>> Hi,
>>
>> What will happen when constructing a cluster of 10 host,
>> but the hosts are gradually removed from the cluster
>> one by one (in each step waiting Ceph status to become healthy),
>> and reaches eventually to, say, 3 hosts ?
>>
>> In other words, is there any problem with having 10 osd configuration
>> in the ceph.conf, but actually only 3 is up (the 7 are down and out) ?
>
> If you're not using the /etc/init.d ceph script to start up everything
> with the -a option, this will work just fine.
>
>>
>> I assume that if the size of the replication is 3, we can turn off
>> 2 osds at each time, and Ceph can recover itself to the healthy state.
>> Is it the case ?
>
> Yeah, that should work fine. You might consider just marking OSDs
> "out" two at a time and not actually killing them until the cluster
> has become quiescent again, though — that way they can participate as
> a source for recovery.
> -Greg
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