How large are the xattrs? -Sam On Tue, May 21, 2013 at 10:13 AM, Emil Renner Berthing <ceph@xxxxxxxx> wrote: > On 21 May 2013 19:05, Samuel Just <sam.just@xxxxxxxxxxx> wrote: >> Do you use xattrs at all? > > Yes, on each object we set between 2 to 4 attributes at write time > which are then left unchanged. > /Emil > >> -Sam >> >> On Tue, May 21, 2013 at 9:34 AM, Anders Saaby <anders@xxxxxxxxx> wrote: >>> On 21/05/2013, at 18.19, Gregory Farnum <greg@xxxxxxxxxxx> wrote: >>>> On Tue, May 21, 2013 at 9:01 AM, Emil Renner Berthing <ceph@xxxxxxxx> wrote: >>>>> On 21 May 2013 17:55, Gregory Farnum <greg@xxxxxxxxxxx> wrote: >>>>>> On Tue, May 21, 2013 at 8:44 AM, Emil Renner Berthing <ceph@xxxxxxxx> wrote: >>>>>>> Hi Greg, >>>>>>> >>>>>>> Here are some more stats on our servers: >>>>>>> - each server has 64GB ram, >>>>>>> - there are 12 OSDs pr. server, >>>>>>> - each OSD uses around 1.5 GB of memory, >>>>>>> - we have 18432 PGs, >>>>>>> - around 5 to 10 MB writes/s is written to each OSD and almost no reads (yet). >>>>>> >>>>>> What interface are you writing with? How many OSD servers are there? >>>>> >>>>> We're using librados and there are 132 OSDs so far. >>>> >>>> Okay, so the allocation is happening in the depths of LevelDB — maybe >>>> the issue is there somewhere. Are you doing anything weird with omap, >>>> snapshots, or xattrs? >>> >>> I can help; No, we are not using omap, snaps or weird stuff with xattrs. >>> >>> We are storing objects of sizes from few KB to GBs. Also, we have a quirk in the application design right now, which means that we store an object, write it again under a new name and delete the original object. - if that is of any potential value to finding this. >>> >>> >>> -- >>> Anders >>> -- 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
