From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Mailand Subject: Re: ceph and ext4 Date: Mon, 14 Nov 2011 20:40:38 +0100 Message-ID: <4EC16EB6.3060707@tuxadero.com> References: <4EC10664.1080501@tuxadero.com> <4EC118A1.1030008@tuxadero.com> Reply-To: martin@tuxadero.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from einhorn.in-berlin.de ([192.109.42.8]:50417 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752305Ab1KNTkt (ORCPT ); Mon, 14 Nov 2011 14:40:49 -0500 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Gregory Farnum Cc: Tomasz Paszkowski , ceph-devel@vger.kernel.org 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 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 >>> 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@vger.kernel.org >>>> 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@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >>