I've been moving users from one system to another by doing a dsync mirror operation. The first dsync mirror takes some time, because of the number of users involved, so I am doing an initial sync, and then I direct the users to the new location and do a final 'freshening' sync to get any changes that happened during the longer sync.

The problem seems to be with this freshening sync, it seems quite fragile breaking with things like:

dsync-local(user@example.com): Error: msg-get failed: box=Spam uid=3034 guid=1ad456015ae9694f083b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69096 guid=c22b541a71e4694fc93700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69097 guid=4b6d6b13d0e9694f505700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69098 guid=175b1c2e4aea694fc97100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69099 guid=bfb08c1b3bee694f133e00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69100 guid=fa5d630c17ef694fa75f00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69101 guid=7ca96011dcef694f3f0400001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69102 guid=ef547107eff1694ff96700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69103 guid=5597bc0519f2694f2e7000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69104 guid=8336a53a54f5694fb21000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69105 guid=96169d13c8fd694f831800001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69106 guid=af21a5183f036a4f263200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69107 guid=d0fde3348e036a4ff44000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69108 guid=4ce01d1a59056a4fee2200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69109 guid=497f96066e056a4f322700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69110 guid=ef34f505c0066a4fc26b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69111 guid=81adcb2c6e076a4f751100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69112 guid=a110841e8a076a4fa21500001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69113 guid=60d8e70a970d6a4fae2100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69114 guid=7c6cb41572106a4ff13c00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69115 guid=aaf4d32b2f126a4ff21000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69116 guid=ab52f43a58126a4ffd1800001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69117 guid=eb543a2179186a4fe45800001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69118 guid=cd7cb408a12a6a4f272100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69119 guid=2ec02e2ef2326a4f9e1100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69120 guid=e7a4552ff8336a4f7f6700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69121 guid=0724b023d33a6a4f1b3300001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69122 guid=9985c91afe3b6a4f127100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69123 guid=9300751b913d6a4f7a4000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69124 guid=822ff806ae3f6a4f293b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69125 guid=eac8ed1f2b426a4f164200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69126 guid=4109561ae3426a4ff26700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69127 guid=30bc832e5e496a4f563600001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69128 guid=c0b36410bd4b6a4f102b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69129 guid=38a9d41a534d6a4ff40200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69130 guid=b8e84d239b4d6a4fd11000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69131 guid=f060ef22154f6a4f2b5c00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69132 guid=e2999c107c4f6a4f5a7600001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69133 guid=8d09280aae506a4f073500001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69134 guid=43d7ec3aa6556a4f963a00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69135 guid=c5800130d2556a4f594200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69136 guid=83a91e08b4566a4f197100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69137 guid=50cf9721f95e6a4f7e4400001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69138 guid=fda2a82886606a4f881700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69139 guid=97ee1d1ad1636a4fc94d00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69140 guid=4f50671f85666a4f306100001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69141 guid=0fea590fb4666a4f7a6b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69142 guid=f3210b02a5676a4ffa1f00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69143 guid=8d325a06686a6a4f2b3600001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69144 guid=0cbf1839f1756a4f8f6800001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69145 guid=d6209a2898796a4f671a00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69146 guid=576ade31da7d6a4f5f5700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69147 guid=70a15b34247e6a4f445a00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69148 guid=3ff92631cd886a4ffd6300001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69149 guid=3ff2081568916a4f134d00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69150 guid=d1a67b0907ab6a4f546000001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69151 guid=3d4cb1197ee96a4fbf5f00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=INBOX uid=69152 guid=aae2542818266b4f7d1e00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2077 guid=c5a0930248e8694fb77c00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2078 guid=dce63e1a6bee694f470200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2079 guid=dde63e1a6bee694f470200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2080 guid=dee63e1a6bee694f470200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2081 guid=dfe63e1a6bee694f470200001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2082 guid=a110b53585056a4fe81b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2083 guid=a210b53585056a4fe81b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2084 guid=93afeb1f7d0b6a4f694e00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2085 guid=ef2bb1098a2e6a4fcf1b00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2086 guid=d8ba601bee2e6a4f982f00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2087 guid=d9ba601bee2e6a4f982f00001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2088 guid=7e5b483b433d6a4fd93600001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2089 guid=7f5b483b433d6a4fd93600001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2090 guid=b08c5205ba646a4f106700001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2091 guid=805b483b433d6a4fd93600001d12b59f dsync-local(user@example.com): Error: msg-get failed: box=sent-mail uid=2092 guid=815b483b433d6a4fd93600001d12b59f dsync-local(user@example.com): Error: Unexpected finish reply: by ims-d13.mx.aol.com (8.14.1/8.14.1) with ESMTP id q2LEhqXZ017169; dsync-local(user@example.com): Error: Unexpected reply from server: Wed, 21 Mar 2012 10:43:52 -0400 dsync-local(user@example.com): Warning: Mailbox changes caused a desync. You may want to run dsync again.

those final "Unexpected finish reply" and "Unexpected reply from server" are a bit surprising results.

Running dsync again seems to resolve things, but there seems to be a bug here that is causing unexpected results to leak through to the dsync process?

thanks, micah