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...guarantee access concurrency safety if you access indexes using more than one instance of dovecot at the same time. Pardon my ignorance, but how does Dovecot handle when an IMAP client connects multiple times concurrently? Does it not launch multiple instances? > Nevertheless, did you try w/o LizardFS, just to rule out any bugs or incompabilities? Moving everybody off of LizardFS is not an option, and this has affected many separate mailboxes. Now that we have implemented a director front end (instead of just a semi-persistent load balancer), the instances have been reduced, but it is still ha...

Hello, I'm introducing to you the decentralized cloud Cherrypop. Combining libvirt and LizardFS (as of now) it becomes a cloud completely without masters. Thus, any node is sufficient for the cloud to be up and therefore no wasted resources and no single point of failure. It's still pretty crude software but will work with some tinkering. Hope you try it and like it! For more informa...

I am running Dovecot IMAP on Linux, on a LizardFS storage cluster with Maildir storage. This has worked well for most of the accounts for several months. However in the last couple of weeks we are seeing increasing errors regarding corrupted index files. Some of the accounts affected are unable to retrieve messages due to timeouts. It appeared...

On Mon, Jul 24, 2017 at 08:39:36AM +0300, Aki Tuomi wrote: > Do you have users accessing the files concurrently from more than one > dovecot instance at a time? Yes. Apparently it is fairly common behavior for some IMAP clients to open up multiple connections to the same mailbox. Some times the multiple accesses came from different servers (stand alone IMAP client and a webmail system), but

Am 21.07.2017 um 19:47 schrieb Bruce Guenter: > > I am running Dovecot IMAP on Linux, on a LizardFS storage cluster with > Maildir storage. This has worked well for most of the accounts for > several months. > > However in the last couple of weeks we are seeing increasing errors > regarding corrupted index files. you should avoid this one solution is to use loadbalancers with pe...

Anyone made some performance comparison between XFS and ZFS with ZIL on SSD, in gluster environment ? I've tried to compare both on another SDS (LizardFS) and I haven't seen any tangible performance improvement. Is gluster different ?

On 09/22/2015 05:12 AM, Michal Privoznik wrote: > On 21.09.2015 21:28, Gustav Fransson Nyvell wrote: >> Hello, >> >> I'm introducing to you the decentralized cloud Cherrypop. >> >> Combining libvirt and LizardFS (as of now) it becomes a cloud completely >> without masters. Thus, any node is sufficient for the cloud to be up >> and therefore no wasted resources and no single point of failure. >> >> It's still pretty crude software but will work with some tinkering. Hope >>...

...t different view of the filesystem you will face corruption. Specially when you are dealing with multiple servers the metadata syncing across servers is a challenge for the cluster filesystems. I?m a bit surprised that the corruption does happen even with one server. > Moving everybody off of LizardFS is not an option, and this has affected > many separate mailboxes. Now that we have implemented a director front > end (instead of just a semi-persistent load balancer), the instances > have been reduced, but it is still happening on accounts that are not > being accessed across multip...

Ok, some more question as I'm still planning our SDS (but I'm prone to use LizardFS, gluster is too inflexible) Let's assume a replica 3: 1) currently, is not possbile to add a single server and rebalance like any order SDS (Ceph, Lizard, Moose, DRBD, ....), right ? In replica 3, I have to add 3 new servers 2) The same should be by add disks on spare slots on existing serv...

On 21.07.2017 20:47, Bruce Guenter wrote: > I am running Dovecot IMAP on Linux, on a LizardFS storage cluster with > Maildir storage. This has worked well for most of the accounts for > several months. > > However in the last couple of weeks we are seeing increasing errors > regarding corrupted index files. Some of the accounts affected are > unable to retrieve messages d...

On Tue, Oct 10, 2017, at 11:19 AM, Gandalf Corvotempesta wrote: > Anyone made some performance comparison between XFS and ZFS with ZIL > on SSD, in gluster environment ? > > I've tried to compare both on another SDS (LizardFS) and I haven't > seen any tangible performance improvement. > > Is gluster different ? Probably not. If there is, it would probably favor XFS. The developers at Red Hat use XFS almost exclusively. We at Facebook have a mix, but XFS is (I think) the most common. Whatever the deve...

...Darcy <jeff at pl.atyp.us> wrote: > On Tue, Oct 10, 2017, at 11:19 AM, Gandalf Corvotempesta wrote: > > Anyone made some performance comparison between XFS and ZFS with ZIL > > on SSD, in gluster environment ? > > > > I've tried to compare both on another SDS (LizardFS) and I haven't > > seen any tangible performance improvement. > > > > Is gluster different ? > > Probably not. If there is, it would probably favor XFS. The developers > at Red Hat use XFS almost exclusively. We at Facebook have a mix, but > XFS is (I think) th...

On 21.09.2015 21:28, Gustav Fransson Nyvell wrote: > Hello, > > I'm introducing to you the decentralized cloud Cherrypop. > > Combining libvirt and LizardFS (as of now) it becomes a cloud completely > without masters. Thus, any node is sufficient for the cloud to be up > and therefore no wasted resources and no single point of failure. > > It's still pretty crude software but will work with some tinkering. Hope > you try it and lik...

...nto our network.) > > -- > Bruce Guenter <bruce at untroubled.org> http://untroubled.org/ Well, dovecot does not really guarantee access concurrency safety if you access indexes using more than one instance of dovecot at the same time. Nevertheless, did you try w/o LizardFS, just to rule out any bugs or incompabilities? Aki

On Wed, 2018-05-09 at 18:26 +0000, Gandalf Corvotempesta wrote: > Ok, some more question as I'm still planning our SDS (but I'm prone > to use > LizardFS, gluster is too inflexible) > > Let's assume a replica 3: > > 1) currently, is not possbile to add a single server and rebalance > like any > order SDS (Ceph, Lizard, Moose, DRBD, ....), right ? In replica 3, I > have > to add 3 new servers You can change the replica...

...ion The Software Defined Storage devroom will go into it's second round for talks around Open Source Software Defined Storage projects, management tools and real world deployments. Presentation topics could include but are not limited too: - Your work on a SDS project like Ceph, GlusterFS or LizardFS - Your work on or with SDS related projects like SWIFT or Container Storage Interface - Management tools for SDS deployments - Monitoring tools for SDS clusters ** Important dates: - 26 Nov 2017: submission deadline for talk proposals - 15 Dec 2017: announcement of the final schedule - 4 F...

...9;s second round for > > talks around Open Source Software Defined Storage projects, management tools > > and real world deployments. > > > > Presentation topics could include but are not limited too: > > > > - Your work on a SDS project like Ceph, GlusterFS or LizardFS > > > > - Your work on or with SDS related projects like SWIFT or Container Storage > > Interface > > > > - Management tools for SDS deployments > > > > - Monitoring tools for SDS clusters > > > > ** Important dates: > > > > -...