Does anyone have any tips for tuning a netapp (and/or clients) for
nfs access to Maildir email folders? I know people do it, and potentially
the load on the server(s) could be less than mbox because you arent shovelling
around huge files, but it seems like the netapp is a little slow with
opening a larger number of files for reading one by one. By large I mean
over a few thousand (three to 130 thousand I have tested with) and slow
I mean between 200 and 500 headers read per second from nfs. It is only
slow if the filer does not have it cached already, because followup folder
opens get several thousand headers per second throughput, similar to mbox.
I have not tried other nfs servers, but I have attempted to simulate the
load from courier-imapd or dovecot using a shell script to read 2 dozen lines
from each of several thousand mail files, and the delay seems to be the netapp.
Additionally, if if is a fresh folder open (not cached anywhere), the first
2,000 or so message headers load quickly, it slows down to between 200-500/sec
for the next few thousand, and if you let it get above several tens of thousands,
it continues to slow even more, down to less than 100 headers per second.
I am somewhat dissapointed that the NOW forums and documentation is
pretty much devoid of any mention of Maildir, let alone tuning for it.
I have a FAS940, not heavily loaded, and the clients for this are a small
cluster of Dell Poweredge 2650 dual 2ghz xeons, running in pre-production
environments of either Debian Linux or FreeBSD 6.x. The filer is running
7.0.3, and the files are stored in a flexvol in an aggregate spanning 3 DS14's
full of disks (28x36, 14x72).