Sync_client or rsync/zfs

Hi everyone.


When I installed my cyrus imap (3.0.17) server I use sync_client to make two slaves 

  Master -- sync_client --> slave 1 -- sync_client --> slave 2 

but since the beginning I very got a lot of problem with this sync.

Sometime it will be working fine during 1 month , then it will crash every
8 - 10 hours. 

Currently since 20 days my sync_client crash regularly, I've no idea why. 

I got notice/error like 

Jan 19 10:20:37 FQDN sync_client[56922]: Error in do_sync(): bailing out! The remote Server(s) denied the operation
Jan 19 10:21:27 FQDN sync_client[56922]: MAILBOX received NO response: Unknown error
Jan 19 10:21:27 FQDN sync_client[56922]: Error in do_sync(): bailing out! The remote Server(s) denied the operation
Jan 19 10:21:39 FQDN sync_client[56922]: IOERROR: zero length response to MAILBOX (end of file reached)
Jan 19 10:21:39 FQDN sync_client[56922]: Error in do_sync(): bailing out! Bad protocol
Jan 19 10:56:03 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN1 35038 (5495723713e3383847128719f3ff4a7e54fd3922)
Jan 19 10:56:03 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN1 35039 (39fcbeec876749c45a7a4ae5fa1ae7a1453b8454)
Jan 19 10:56:03 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN1 35038 (5495723713e3383847128719f3ff4a7e54fd3922)
Jan 19 10:56:03 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN1 35039 (39fcbeec876749c45a7a4ae5fa1ae7a1453b8454)
Jan 19 10:56:16 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN2 383918 (45ae38b4a5ce001aa642d76224e9eac2bdf07775)
Jan 19 10:56:16 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN2 383918 (45ae38b4a5ce001aa642d76224e9eac2bdf07775)
Jan 19 10:57:10 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN3 60893 (075af2111ff386f4bc73cc10b41cb83b3d800a63)
Jan 19 10:57:10 FQDN sync_client[49408]: SYNCERROR: only exists on master user.LOGIN3 60893 (075af2111ff386f4bc73cc10b41cb83b3d800a63)

Anyone have any idea ? 

Beside this problem, what are the actual advantage between sync_client and
some classique 

  zfs snapshot MAILBOX 
  zfs send SNAPSHOT --> other server

? 

Knowning my slave are unable to perform as master (because they don't have
ssd for the db).

Regards



-- 
Albert SHIH 🦫 🐸
Observatoire de Paris
France
Heure locale/Local time:
jeu. 19 janv. 2023 10:48:32 CET

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