search for: resiliency

I''m planning on setting up an NFS server for our ESXi hosts and plan on using a virtualized Solaris or Nexenta host to serve ZFS over NFS. The storage I have available is provided by Equallogic boxes over 10Gbe iSCSI. I am trying to figure out the best way to provide both performance and resiliency given the Equallogic provides the redundancy. Since I am hoping to provide a 2TB datastore I am thinking of carving out either 3 1TB luns or 6 500GB luns that will be RDM''d to the storage VM and within the storage server setting up either 1 raidz vdev with the 1TB luns (less RDMs) or 2 ra...

Hi Dovecot team, I need help in configuring HA/resilence for my dovecot (POP3/IMAP) server. I have one RHEL Linux POP3/IMAP server with Dovecot version 2.2.10. I also installed the postfix(version: 2.6.6) in it. At present it have around 10 domains and each domain is having around 20 email boxes. It has very simple configuration. User's reading the email via some internal

Thank you Aki for the reply. But I cannot disturb the version at present as it is a live server and thousands of emails will circulate every hour. Could you please suggest me how to create HA/resilience for the existing environment. I have another server ready with the similar configuration. Please provide any steps/link for me to proceed on this? It will be a great help to me. Thanks, Kishore

Hello, 1) If i create a raidz2 pool on some disks, start to use it, then the disks'' controllers change. What will happen to my zpool? Will it be lost or is there some disk tagging which allows zfs to recognise the disks? 2) if i create a raidz2 on 3 HDs, do i have any resilience? If any one of those drives fails, do i loose everything? I''ve got one such pool and

Thank you all for the replies.... I have the test environment with the same configuration. But I have been asked to go with same environment for HA/Resilience in Live. Yes, I have only one Live server. It is configured in "Maildir" format. The data stores on a Network / Shared Storage (But definitely not local disk, its a mount point). I have been asked to create a HA/Resilience for

Hi, I ran "yum update" this morning on a 7.2 machine with all of the cr updates applied to it and yum wants to install lvm-cluster and a bunch of deps. Dependencies Resolved ====================================================================== Package Arch Version Repository Size ======================================================================

You can do it using replication, https://wiki.dovecot.org/Replication but since you have no staging/test environment, I would advice you to get one. Aki > On 09/01/2020 18:45 Kishore Potnuru <kishore.reachme at gmail.com> wrote: > > > Thank you Aki for the reply.? > > But I cannot disturb the version at present as it is a live server and thousands of emails will

On Fri, Jan 10, 2020 at 09:07:24AM +0200, Aki Tuomi wrote: > Replication is not supported with mbox. Most features are not. It would be nice if the document about replication could tell what setup works. -- Emmanuel Dreyfus manu at netbsd.org

Hello, you need to "clone" the first server, change the ip address, mount the same maildir storage and use some mechanism to share the accounts database. Then you need to put a TCP load-balancer in front of the servers an you are good to go. This is the easiest solution if you already have in the network an appliance that can do LB. For instance if you already have a firewall with

Dear OpenSSH Community, Please find an experimental patch for resilient SSH connections from the web page below. It enables an SSH session to continue over sequential TCP connections in case of a broken TCP connection or change of an IP address. The page also includes the related USENIX'06 paper which describes the design in detail. http://www.infrahip.net/resilient/ Best regards,

Hi, I am using theora codec to stream video. Sometimes I am getting (due network actions- packet loss / delay) a distortion in the video image degrading its quality and I think it is something related to the video slices / chunks (dropped or disordered) of the entire frame. Are there plans for slicing and loss detection/resilience built-in theora codec? Will theora codec have a similar approach

Hi All, I need to migrate the complete data & setup/environment from an old dovecot environment to a new dovecot environment. Old environment details: ======================== Linux OS - Red Hat Enterprise Linux Server release 6.5 (Santiago) Dovecot version - 2.0.9 Postfix version - 2.6.6 New Environment details: ( 2 systems) ======================== Linux OS - Red Hat

Yes, but it works for small systems if you set IP source address persistence on LB or even better, if you set priority to be Active/Standby. I couldn't find a good example with dovecot director and backend on the same server, so adding another two machines seems overkill for small setups. If someone has a working example for this please make it public ! Quote from

I compiled SPEC CPU2006 bzip2 with Clang, and generated profiles with OPT's -insert-optimal-edge-profiling option. After a profile run, I launched OPT with -profile-loader -profile-verifier flags and also passed -O3 flag. This caused OPT to give a warning "WARNING: profile information is inconsistent with the current program!" and then fail with an assert (ASSERT:inWeight and

> On 09/01/2020 18:25 Kishore Potnuru <kishore.reachme at gmail.com> wrote: > > > Hi Dovecot team,? > > I need help in configuring HA/resilence for my dovecot (POP3/IMAP) server. > > I have one RHEL Linux POP3/IMAP server with Dovecot version 2.2.10. I also installed the postfix(version: 2.6.6) in it. At present it have around 10 domains and each domain is having

Hello folks, I have been asked about the resilience of samba clients when faced with a domain controller failure. My client's environment has multiple Windows Domain Controllers (we'll call them dc1 - dc9). Assuming that domain replication operates as expected (and does, from Windows workstation point of view), what should I expect if (when) the domain controller that initiated a

Hi, We're testing CELT (version 0.7.1) error resilience capability. We've used already celtdec packet-loss options. Hence we know what to expect in case of whole packet loss. How does Celt respond to a broken encoded packet? Is it always better to discard it and decode the missing frame through decode_lost? We have the hardware capability of protecting the frame with multiple CRCs.

On the whole we are pleased with our trials of dovecot to replace UW-IMAP. But (ah!) we have hit one particular problem, in which we think dovecot could probably benefit from a resilience improvement. We're running dovecot on Fedora Core 5 (FC5), with passwd map details supplied by NIS. We have found that "nscd" sometimes thinks that a username is invalid, even though it is valid.

Also you should probably use dovecot director to ensure same user sessions end up on same server, as it's not supported to access same user on different backends in this scenario. Aki > On 10/01/2020 19:49 Adrian Minta <adrian.minta at gmail.com> wrote: > > > > Hello, > > you need to "clone" the first server, change the ip address, mount the same

On Thu, Jan 09, 2020 at 06:51:36PM +0200, Aki Tuomi wrote: > You can do it using replication, > https://wiki.dovecot.org/Replication Last time I tried, it did not work with mbox. Did that change? The document does not tell about the format. -- Emmanuel Dreyfus manu at netbsd.org