Sorry, missed adding the list. ---------- Forwarded message ---------- From: Gregory Farnum <gregory.farnum@xxxxxxxxxxxxx> Date: Mon, Nov 14, 2011 at 11:53 AM Subject: Re: ceph and ext4 To: martin@xxxxxxxxxxxx Yeah, I think we'll be working on it in the next couple of months, but right now we're recommending xfs if you can't do btrfs. On Mon, Nov 14, 2011 at 11:40 AM, Martin Mailand <martin@xxxxxxxxxxxx> wrote: > Hi Gregory, > this is quite bad, so ext4 is still no alternative as a backend fs. > > -martin > > Gregory Farnum schrieb: >> >> On Mon, Nov 14, 2011 at 5:33 AM, Martin Mailand <martin@xxxxxxxxxxxx> >> wrote: >>> >>> Hi Tomasz, >>> as far as I know it still has this limit. >>> But it should be relatively safe to use it. >>> >>> http://marc.info/?l=ceph-devel&m=131942130322957&w=2 >>> >>> If we hit the 4KB limit of xattrs in ext4 how does it show up in the rbd >>> layer? >>> >>> How does it show up in the fs layer, would the fs still be clean? >> >> Right now it would show up very badly, unfortunately. (And yes, the >> limit is still there.) You'd notice, though you might manage to >> corrupt some of your data first. :/ >> >> However, if you're not taking snapshots and you're not using xattrs >> yourself, you won't hit it with rbd or the Ceph FS. >> -Greg >> >>> -martin >>> >>> >>> Am 14.11.2011 14:09, schrieb Tomasz Paszkowski: >>>> >>>> what about limit on xattr size ? Is it still limited to 4KB ? >>>> >>>> >>>> >>>> On Mon, Nov 14, 2011 at 1:15 PM, Martin Mailand<martin@xxxxxxxxxxxx> >>>> wrote: >>>>> >>>>> Hi Christian, >>>>> I am not sure if you noticed, but your ext4 bug is fixed in mainline. I >>>>> am >>>>> running a ceph cluster with 40+ vms for over a week by now, without any >>>>> problems. An fsck.ext4 shows the ext4 is clean. >>>>> The performance of ext4 is much better than btrfs, no rise in the load >>>>> of >>>>> the osd's. >>>>> >>>>> -martin >>>>> -- >>>>> 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
