Hi Jaze, If you write data first, and you have a failure after writing data and before writing to the journal, then you cannot recover that write operation and it will be lost. You can see the journal as a primary replica of data. Ricardo Dias Sent from my mobile phone > On 22 Aug 2016, at 09:46, Jaze Lee <jazeltq@xxxxxxxxx> wrote: > > Hi all: > I found that rbd journaling first write journal and then write data. > Why we not first write data and then write journal? Is there some > considerration > for which is first ? > > Thanks a lot. > > -- > 谦谦君子 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
