We have an SSD dedicated for cache and another dedicated for the log. They seem to help. On 6/28/2018 4:45 PM, Albert Shih wrote: > Le 27/06/2018 à 12:58:22-0400, Eric W. Bates a écrit > > Hi, > > Thanks you *very* much for your answer. > > I will try that. But I'm know pretty sure that the problem doesn't come > from network but from I/O of the disk. > > I manage to configure my mutt (my old MUA) to keep the connection, he lost > the connection because by default he keep the connection only for 15 > secondes. Changing that to 600 secondes and I never get disconnected. > > But I still get some hang (10-30 sec) and I think it's the I/O because the > server hang too or at least very slow down (when I'm connected by ssh) and > If I use atop I'm see the disk are busy. > > Another point is during those time (~1500 connections for ~500 uniques > users), the ARC go down to 20G (by configuration it's get 96Go). > > I will try the zfs tweaking. > > >> >> kern.ipc.maxsockbuf=4194304 # (default 2097152) >> net.inet.tcp.sendbuf_max=4194304 # (default 2097152) >> net.inet.tcp.recvbuf_max=4194304 # (default 2097152) >> net.inet.tcp.mssdflt=1460 # (default 536) >> net.inet.tcp.minmss=1300 # (default 216) >> net.inet.tcp.cc.algorithm=htcp # (default newreno) >> net.inet.tcp.cc.htcp.adaptive_backoff=1 # (default 0 ; disabled) >> net.inet.tcp.cc.htcp.rtt_scaling=1 # (default 0 ; disabled) >> net.inet.tcp.syncache.rexmtlimit=0 # (default 3) >> net.inet.ip.rtexpire=10 # (default 3600) >> net.inet.tcp.syncookies=0 # (default 1) >> net.inet.tcp.tso=0 # (default 1) >> >> kern.ipc.soacceptqueue=32768 # (default 128 ; same as kern.ipc.somaxconn) >> net.inet.tcp.delayed_ack=0 >> >> Been quite a while since we set all that up and it's been performing well. > > well, from thunderbird point of vu everything seem fine, only some *normal* > slow down, users doesn't complain. > > I complain because it's big server with lot of disk (24 disks, 2 SSD for > /var/imap, RAM 192Go), so....I like to make it very efficient > > And again thanks you for your help. > > Regards. > > > > > -- > Albert SHIH > DIO bâtiment 15 > Observatoire de Paris > xmpp: jas@xxxxxxxx > Heure local/Local time: > Thu Jun 28 22:35:43 CEST 2018 > -- Clark 159a, MS 46 508/289-3112
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
