similar to: Unsafe migration with copy-storage-all (non shared storage) and writeback cache

Hi all, I write about libvirt inconsistent behavior when mixing io=native and cache=writeback. This post can be regarded as an extension, or clarification request, of BZ 1086704 (https://bugzilla.redhat.com/show_bug.cgi?id=1086704) On a fully upgraded CentOS6 x86-64 machine, starting a guest with io=native and cache=writeback is permitted: no errors are raised and the VM (qemu, really)

On 17/02/2017 19:50, Jiri Denemark wrote: > > Yeah storage migration should be safe regardless of the cache mode used. > Very good news, thanks. Let me be paranoid: is it *surely* safe? > > This looks like a bug in libvirt. The code doesn't check whether an > affected disk is going to be migrated (--copy-storage-all) or accessed > on the shared storage. > > Jirka

Il 26-08-2017 01:13 WK ha scritto: > Big +1 on what was Kevin just said.? Just avoiding the problem is the > best strategy. Ok, never run Gluster with anything less than a replica2 + arbiter ;) > However, for the record,? and if you really, really want to get deep > into the weeds on the subject, then the? Gluster people have docs on > Split-Brain recovery. > >

Il 23-08-2017 18:14 Pavel Szalbot ha scritto: > Hi, after many VM crashes during upgrades of Gluster, losing network > connectivity on one node etc. I would advise running replica 2 with > arbiter. Hi Pavel, this is bad news :( So, in your case at least, Gluster was not stable? Something as simple as an update would let it crash? > I once even managed to break this setup (with

Ciao Gionatan, I run Gluster 3.10.x (Replica 3 arbiter or 2 + 1 arbiter) to provide storage for oVirt 4.x and I have had no major issues so far. I have done online upgrades a couple of times, power losses, maintenance, etc with no issues. Overall, it is very resilient. Important thing to keep in mind is your network, I run the Gluster nodes on a redundant network using bonding mode 1 and I have

Solved as to 3.7.12. The only bug left is when adding new bricks to create a new replica set, now sure where we are now on that bug but that's not a common operation (well, at least for me). On Wed, Aug 30, 2017 at 05:07:44PM +0200, Ivan Rossi wrote: > There has ben a bug associated to sharding that led to VM corruption that > has been around for a long time (difficult to reproduce I

On 14/07/15 08:17, Steffen Kaiser wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Mon, 13 Jul 2015, Gionatan Danti wrote: > >> On the other hand, private (per-user) sieve file works without >> interfering with hardlinks. In a similar manner, disabling sieve also >> permits dovecot to create multiple hardlinks for a single message. >> >>

On 30 Nov 2015, at 17:48, Gionatan Danti <g.danti at assyoma.it> wrote: > > Hi Timo, > glad to know it is in your TODO list ;) It's been for many years. > Any rough ETA on that? Right now it doesn't seem likely to be developed anytime soon. > Thanks. > > On 30/11/2015 14:23, Timo Sirainen wrote: >> On 30 Nov 2015, at 10:21, Gionatan Danti <g.danti

Sorry for the bump... Anyone know if it is possible to have multiple protocols instances with different ssl_protocols settings? Regards. On 07/02/15 00:03, Gionatan Danti wrote: > Hi all, > anyone with some ideas? > > Thanks. > > Il 2015-02-02 23:08 Gionatan Danti ha scritto: >> Hi all, >> I have a question regarding the "ssl_protocols" parameter.

On 30 Nov 2015, at 10:21, Gionatan Danti <g.danti at assyoma.it> wrote: > > So, let me do a straigth question: is someone using dovecot/LMTP with hardlinking? To me, this seems a _very_ important feature, and I wonder if I am doing something wrong or if the feature (hardlink+sieve) simply does not exists. Hardlink+Sieve has never worked. The fix is a bit complicated. Here's my

Il 01-06-2017 19:42 Jeremy Allison ha scritto: > On Thu, Jun 01, 2017 at 03:11:53PM +0200, Gionatan Danti wrote: >> However, *no* user authentication is possible on samba shares when >> the VPN tunnel is down? >> >> Do you have any suggestions? > > I think Uri and Volker did the work on this. Uri, can you > give an update on where we stand with offline auth

Il 23-12-2019 12:04 Gionatan Danti ha scritto: > On 19/12/19 11:08, Gionatan Danti wrote: >> Hi list, >> many moons ago I asked about preserving hardlink between identical >> messages when pigeonhole (for sieve filtering) was used. >> >> The reply was that, while hardlink worked well for non-filtered >> messages, using pigeonhole broke the hardlink (ie:

Il 26-08-2017 07:38 Gionatan Danti ha scritto: > I'll surely give a look at the documentation. I have the "bad" habit > of not putting into production anything I know how to repair/cope > with. > > Thanks. Mmmm, this should read as: "I have the "bad" habit of not putting into production anything I do NOT know how to repair/cope with" Really :D

There has ben a bug associated to sharding that led to VM corruption that has been around for a long time (difficult to reproduce I understood). I have not seen reports on that for some time after the last fix, so hopefully now VM hosting is stable. 2017-08-30 3:57 GMT+02:00 Everton Brogliatto <brogliatto at gmail.com>: > Ciao Gionatan, > > I run Gluster 3.10.x (Replica 3 arbiter

Hi list, many moons ago I asked about preserving hardlink between identical messages when pigeonhole (for sieve filtering) was used. The reply was that, while hardlink worked well for non-filtered messages, using pigeonhole broke the hardlink (ie: some message-specific data was appended to the actual mail file). Here you can find the original thread:

Hi list, we all know why ZFS is not included in RHEL/CentOS distributions: its CDDL license is/seems not compatible with GPL license. I'm not a layer, and I do not have any strong opinion on the matter. However, as a sysadmin, I found ZFS to be extremely useful, especially considering BTRFS sad state. I would *really* love to have ZFS on Linux more intergrated with current CentOS. From

Hi Javier, thanks for your reply. I already checked SIS and, while interesting, is not what I want, because: 1) it can be difficult to restore a single message/attachment from a backup 2) only the attachments, and not the entire messages, are deduped. Message-based hardlinks really exists for a reason. The good news is that I found _why_ they are not working: it depends from how dovecot and

Hi all, I have a question regarding the "ssl_protocols" parameter. I understand that editing the 10-ssl.conf file I can set the ssl_protocols variable as required. At the same time, I can edit a single protocol file (eg: 20-pop3.conf) to set the ssl_protocols for a specific protocol/listener. I wander if (and how) I can create a different listener for another POP3 instance, for

Hi list, I would like to know if the following rsync's behavior can be changed/modified. I noticed that when rsync receive a file for which the local filesystem already has a symlinks with the same path/name, it _first_ delete the symlink, _then_ it start the transfer. I think there are two problems with this approach: - it completely ignores the content of the symlinked files, which can

On Fri, Feb 17, 2017 at 02:52:06PM +0100, Gionatan Danti wrote: >Hi all, >I write about libvirt inconsistent behavior when mixing io=native and >cache=writeback. This post can be regarded as an extension, or >clarification request, of BZ 1086704 >(https://bugzilla.redhat.com/show_bug.cgi?id=1086704) > >On a fully upgraded CentOS6 x86-64 machine, starting a guest with