发自我的 iPhone
在 2013-7-23，0:21，"Gandalf Corvotempesta" <gandalf.corvotempe...@gmail.com> 写道： > 2013/7/22 Chen, Xiaoxi <xiaoxi.c...@intel.com>: >> Imaging you have several writes have been flushed to journal and acked，but >> not yet write to disk. Now the system crash by kernal panic or power >> failure，you will lose your data in ram disk，thus lose data that assumed to >> be successful written. > > The same apply in case of journal failure with data still on it. > Imagine an SSD journal with 50GB of data. If SSD fails, all datas are lost. > > The only difference is that RAM is volatile and subjected to kernel > panics or power failure (I only have dual power server) but actuall > RAM is *MUCH* more reliable than SSD. I've never seen a single RAM > module (server grade) failed from the latest 5-6 year. RAM is physically much more reliable than ssd,but when taking kernel/power failure into account, i would like to bet Ram disk is MUCH dangerous than ssd _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
