On Wed, 27 Apr 2016, ching lu wrote: > is there any command for forcing flushing cache or invalidate cache? I think you would benefit from reading this: https://www.kernel.org/doc/Documentation/bcache.txt -- Eric Wheeler > > On Wed, Apr 27, 2016 at 3:57 AM, Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx> wrote: > > On Tue, 26 Apr 2016, ching lu wrote: > > > >> Hi all, > >> > >> if i have 1 SSD caching 1 HDD using bcache, the cache mode is writeback > >> > >> if the PC shutdown/unmount normally, will all dirty data in the cache > >> be flushed to backing device before poweroff? > > > > No, it will remain in the cache. > > > >> i am afraid that SSD lose data if left without power for a long time. > >> e.g. hoilday. > > > > Wouldn't your data be retained if you used the SSD alone? SSDs should be > > stable in a powered off state unless it is a bad device. > > > > There exist RAM-based disks that may be volatile, but that is unlikely to > > be your situation. > > > > -- > > Eric Wheeler > > > >> > >> Thanks in advance, > >> C > >> -- > >> To unsubscribe from this list: send the line "unsubscribe linux-bcache" 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 linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
