Question on Checkpoints

After a checkpoint, how many "buffers not flushed" is considered acceptable? Let's say the typical check point (every 15 minutes) looks like this: 10:30:40 Maximum server connections 296 10:45:40 Fuzzy Checkpoint Completed: duration was 0 seconds, 179 buffers not flushed, timestamp: 1279827764. 10:45:40 Checkpoint loguniq 423, logpos 0x3228a4, timestamp: 1279827764 The number not flushed ranges from 130 to 190. These are some settings: BUFFERS 60000 # Maximum number of shared buffers CKPTINTVL 900 # Check point interval (in sec) LRUS 128 # Number of LRU queues LRU_MAX_DIRTY 10 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 2 # LRU percent dirty end cleaning limit onstat -p (after about 3 hours use after a clear) looks like this IBM Informix Dynamic Server Version 9.40.TC2 -- On-Line -- Up 68 days 22:10:04 -- 359360 Kbytes Profile dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached 18474 115424 22278735 99.92 8587 12262 79170 89.15 isamtot open start read write rewrite delete commit rollbk 32781258 1951207 2053832 16244836 20829 11720 13356 5659 6 gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs 0 0 0 0 0 0 0 ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes 0 0 0 341.95 101.13 53 522 bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans 86 0 24668711 0 0 3 429 8190 ixda-RA idx-RA da-RA RA-pgsused lchwaits 0 0 0 0 93 sending to informix-list