> -----Original Message----- > From: Sage Weil [mailto:sage@xxxxxxxxxxxx] > Sent: Wednesday, March 30, 2016 3:25 PM > To: Vikas Sinha-SSI <v.sinha@xxxxxxxxxxxxxxx> > Cc: Allen Samuels <Allen.Samuels@xxxxxxxxxxx>; Igor Fedotov > <ifedotov@xxxxxxxxxxxx>; ceph-devel <ceph-devel@xxxxxxxxxxxxxxx> > Subject: RE: Adding compression/checksum support for bluestore. > > On Wed, 30 Mar 2016, Vikas Sinha-SSI wrote: > > > [snip] > > > > If I understand correctly, then there would still be a cost associated > > with writing dis-contiguously to disk. In cases such as this where the > > resources for compression are not easily available, I wonder if it is > > reasonable to simply not do compression for that Write. The cost of not > compressing would be a missed space optimization, but the cost of > compressing in any and all cases could be significant to latency. > > I also like this better than the split pextent complexity. I agree that the complexity is reduced -- which is good. Of course this is traded-off with a reduced storage capability, provided that this doesn't happen very often -- this might be a reasonable approach . I want to brood on this for a while. > > sage -- 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
