I had the samt question in the past but there seems no way to change it for the ceph team Stefan This mail was sent with my iPhone. > Am 09.01.2014 um 18:28 schrieb Gregory Farnum <greg@xxxxxxxxxxx>: > > The FileJournal is also for data safety whenever we're using write > ahead. To disable it we need a backing store that we know can provide > us consistent checkpoints (i.e., we can use parallel journaling mode — > so for the FileJournal, we're using btrfs, or maybe zfs someday). But > for those systems you can already configure the system not to use a > journal. > -Greg > Software Engineer #42 @ http://inktank.com | http://ceph.com > > >> On Thu, Jan 9, 2014 at 12:13 AM, Haomai Wang <haomaiwang@xxxxxxxxx> wrote: >> Hi all, >> >> We know FileJournal plays a important role in FileStore backend, it can >> hugely reduce write latency and improve small write operations. >> >> But in practice, there exists exceptions such as we already use FlashCache or cachepool(although it's not ready). >> >> If cachepool enabled, we may use use journal in cache_pool but may >> not like to use journal in base_pool. The main reason why drop journal >> in base_pool is that journal take over a single physical device and waste >> too much in base_pool. >> >> Like above, if I enable FlashCache or other cache, I'd not like to enable >> journal in OSD layer. >> >> So is it necessary to disable journal in special(not really special) case? >> >> Best regards, >> Wheats >> >> >> >> -- >> 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 -- 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
