>>
>> FWIW when using rbd-mirror to migrate volumes between SATA SSD clusters, I
>> found that
>>
>>
>> rbd_mirror_journal_max_fetch_bytes:
>>section: "client"
>>value: "33554432"
>>
>> rbd_journal_max_payload_bytes:
>>section: "client"
>>value: “8388608"
>
> Indeed,
On Tue, Mar 10, 2020 at 2:31 PM Anthony D'Atri wrote:
>
> FWIW when using rbd-mirror to migrate volumes between SATA SSD clusters, I
> found that
>
>
>rbd_mirror_journal_max_fetch_bytes:
> section: "client"
> value: "33554432"
>
> rbd_journal_max_payload_bytes:
> section:
FWIW when using rbd-mirror to migrate volumes between SATA SSD clusters, I
found that
rbd_mirror_journal_max_fetch_bytes:
section: "client"
value: "33554432"
rbd_journal_max_payload_bytes:
section: "client"
value: “8388608"
Made a world of difference in expediting
On Tue, Mar 10, 2020 at 11:53 AM Ml Ml wrote:
>
> Hello Jason,
>
> okay, good hint!
>
> I did not realize, that it will write the journal 1:1 but that makes
> sense. I will benchmark it later.
Yes, it's replaying the exact IOs again to ensure it's point-in-time consistent.
> However, my backup
Hello Jason,
okay, good hint!
I did not realize, that it will write the journal 1:1 but that makes
sense. I will benchmark it later.
However, my backup cluster is the place where the old spinning rust
will find its last dedication.
Therefore it will never be as fast as the live cluster.
Hello Jason,
thanks for that fast reply.
This is now my /etc/ceph/ceph.conf
[client]
rbd_mirror_journal_max_fetch_bytes = 4194304
I stopped and started my rbd-mirror manually with:
rbd-mirror -d -c /etc/ceph/ceph.conf
Still same result. Slow speed shown by iftop and entries_behind_master
On Tue, Mar 10, 2020 at 10:36 AM Ml Ml wrote:
>
> Hello Jason,
>
> thanks for that fast reply.
>
> This is now my /etc/ceph/ceph.conf
>
> [client]
> rbd_mirror_journal_max_fetch_bytes = 4194304
>
>
> I stopped and started my rbd-mirror manually with:
> rbd-mirror -d -c /etc/ceph/ceph.conf
>
>
On Tue, Mar 10, 2020 at 6:47 AM Ml Ml wrote:
>
> Hello List,
>
> when i initially enable journal/mirror on an image it gets
> bootstrapped to my site-b pretty quickly with 250MB/sec which is about
> the IO Write limit.
>
> Once its up2date, the replay is very slow. About 15KB/sec and the
>
