System I/O errors after Cyrus upgrade

[Shawn Sivy]

I upgrade from Cyrus 2.0.16 to Cyrus 2.2.5 this past weekend.  I also 
upgrade Postfix from 1.x to 2.1.1.  After running for a little while, I 
get the error messages below.  If I run a "postfix flush", the message 
usually get delivered fine.  I've seen some talk on the list about 
System I/O errors and interaction with Postfix, Cyrus and LMTP, but I 
haven't a solution that worked for my situation.  Any help or direction 
would be appreciated.

May 30 17:52:57 cyrus lmtpunix[14954]: [ID 240394 local6.error] IOERROR: 
opening quota file /var/imap/quota/m/user.macey2: Too many open files
May 30 17:52:57 cyrus lmtpunix[14954]: [ID 335833 local6.error] DBERROR: 
error fetching user.macey2: cyrusdb error
May 30 17:52:57 cyrus lmtpunix[14954]: [ID 860734 local6.debug] 
verify_user(user.macey2) failed: System I/O error
May 30 17:53:20 cyrus lmtpunix[14954]: [ID 240394 local6.error] IOERROR: 
opening quota file /var/imap/quota/s/user.sdhugg: Too many open files
May 30 17:53:20 cyrus lmtpunix[14954]: [ID 335833 local6.error] DBERROR: 
error fetching user.sdhugg: cyrusdb error
May 30 17:53:20 cyrus lmtpunix[14954]: [ID 860734 local6.debug] 
verify_user(user.sdhugg) failed: System I/O error
May 30 17:53:40 cyrus lmtpunix[14954]: [ID 240394 local6.error] IOERROR: 
opening quota file /var/imap/quota/s/user.samuel2: Too many open files
May 30 17:53:40 cyrus lmtpunix[14954]: [ID 335833 local6.error] DBERROR: 
error fetching user.samuel2: cyrusdb error
May 30 17:53:40 cyrus lmtpunix[14954]: [ID 860734 local6.debug] 
verify_user(user.samuel2) failed: System I/O error
May 30 17:54:05 cyrus lmtpunix[14954]: [ID 240394 local6.error] IOERROR: 
opening quota file /var/imap/quota/b/user.balaisi2: Too many open files
May 30 17:54:05 cyrus lmtpunix[14954]: [ID 335833 local6.error] DBERROR: 
error fetching user.balaisi2: cyrusdb error
May 30 17:54:05 cyrus lmtpunix[14954]: [ID 860734 local6.debug] 
verify_user(user.balaisi2) failed: System I/O error

Thanks,

  -Shawn

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