grwong_gt at yahoo
Oct 28, 2009, 11:22 AM
Post #1 of 1
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Does syncing affect File Descriptor access on applications running on the DRBD device?
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Hope I did not double post - Apologies if I did.
I am using DRBD 8.2.6.
The application is qmail in a Centos 4.8 openVZ VPS. The VPS runs on the DRBD device.
While syncing, no mail gets delivered (to local or remote destinations), although they appear in the qmail queue.
If I disconnect the primary node, mail is delivered.
Reading qmail documentation, qmail forks the messages in the queue to qmail-send, which hands off to
either qmail-lspawn (local) or qmail-rspawn (remote) for mail processing.
From the qmail docs:
qmail-lspawn reads a series of local delivery commands from
descriptor 0, invokes qmail-local to perform the deliveries,
and prints the results to descriptor 1. It passes
aliasempty to qmail-local as the default delivery instruc-
tion.
This leads to the question, is there some sort of block on the fd (or other related IO services) while DRBD is syncing?
Thanks in advance.
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