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IDS Forum

I/O writes

Posted By: KAMRAN HAQ
Date: Friday, 17 July 2009, at 9:33 a.m.

Hi,
Below are the stats gathered from an IDS instance (restarted around 2 hours ago). We see that checkpoints are taking too much time sometimes. Problems looks in I/O. How can we improve "LRU writes" and reduce "Chunk writes" as I read that "LRU writes" are better. Also how to keep max length (onstat -g ioq) shorter.
OS: SunOS 5.10 sun4v sparc
regards,
Kamran
--------------------------------------------------------------
$ onstat -F
IBM Informix Dynamic Server Version 11.50.FC3W1 -- On-Line (Prim) -- Up 01:09:50 -- 921600 Kbytes
Fg Writes LRU Writes Chunk Writes
0 0 622567
address flusher state data # LRU Chunk Wakeups Idle Tim
119c6d870 0 I 0 0 32 4202 4172.668
119c6e0b8 1 I 0 0 36 4190 4154.733
119c6e900 2 I 0 0 28 4197 4173.793
119c6f148 3 I 0 0 30 4196 4166.957
119c6f990 4 I 0 0 30 4194 4163.863
119c701d8 5 I 0 0 34 4179 4145.377
119c70a20 6 I 0 0 36 4181 4145.399
119c71268 7 I 0 0 29 4197 4167.696
119c71ab0 8 I 0 0 28 4197 4169.929
119c722f8 9 I 0 0 24 4199 4176.918
119c72b40 10 I 0 0 24 4196 4172.204
119c73388 11 I 0 0 23 4192 4171.186
119c73bd0 12 I 0 0 22 4192 4171.252
119c74418 13 I 0 0 20 4196 4176.573
119c74c60 14 I 0 0 20 4193 4175.085
119c754a8 15 I 0 0 20 4192 4174.220
119c75cf0 16 I 0 0 20 4188 4170.391
119c76538 17 I 0 0 20 4193 4173.006
119c76d80 18 I 0 0 19 4188 4170.294
119c775c8 19 I 0 0 18 4185 4166.483
119c77e10 20 I 0 0 17 4175 4157.900
119c78658 21 I 0 0 17 4153 4135.801
119c78ea0 22 I 0 0 16 4147 4130.073
119c796e8 23 I 0 0 16 4148 4131.168
states: Exit Idle Chunk Lru
$ onstat -g ioq
IBM Informix Dynamic Server Version 11.50.FC3W1 -- On-Line (Prim) -- Up 01:10:04 -- 921600 Kbytes
AIO I/O queues:
q name/id len maxlen totalops dskread dskwrite dskcopy
drda_dbg 0 0 0 0 0 0 0
sqli_dbg 0 0 0 0 0 0 0
adt 0 0 0 0 0 0 0
msc 0 0 2 10356 0 0 0
aio 0 0 34 4957068 26 4954270 0
pio 0 0 1 4208 0 4208 0
lio 0 0 1 934928 0 934928 0
gfd 3 0 3 44271 44168 103 0
gfd 4 0 5 183 52 131 0
gfd 5 0 31 164375 163919 456 0
gfd 6 0 16 5707 1454 4253 0
gfd 7 0 2 25179 25179 0 0
gfd 8 0 31 657803 657480 323 0
gfd 9 0 14 3977 3879 98 0
gfd 10 0 31 581371 577245 4126 0
gfd 11 0 30 46808 46730 78 0
gfd 12 0 11 3140 3076 64 0
gfd 13 0 1 1153 1153 0 0
gfd 14 0 45 245420 244784 636 0
gfd 15 0 29 15783 15335 448 0
gfd 16 0 1 17 17 0 0
gfd 17 0 1 20 20 0 0
gfd 18 0 30 224616 224114 502 0
gfd 19 0 2 3273 3266 7 0
gfd 20 0 30 62404 61709 695 0
gfd 21 0 30 170825 169045 1780 0
gfd 22 0 30 11490 11065 425 0
gfd 23 0 31 232938 231740 1198 0
gfd 24 0 30 68956 65598 3358 0
gfd 25 0 31 175224 174670 554 0
gfd 26 0 31 253559 251803 1756 0
gfd 27 0 30 201740 199354 2386 0
gfd 28 0 43 717590 707646 9944 0
gfd 29 0 31 790372 774676 15696 0
gfd 30 0 1 1 1 0 0
gfd 31 0 46 719426 679486 39940 0
gfd 32 0 32 853121 759948 93173 0
gfd 33 0 48 1158744 1006962 151782 0
gfd 34 0 1 83 83 0 0
gfd 35 0 41 728786 654252 74534 0
gfd 36 0 32 692805 615643 77162 0
gfd 37 0 31 1075115 934510 140605 0
gfd 38 0 1 1 1 0 0
gfd 39 0 0 0 0 0 0
gfd 40 0 0 0 0 0 0
gfd 41 0 0 0 0 0 0
gfd 42 0 0 0 0 0 0
gfd 43 0 0 0 0 0 0
gfd 44 0 0 0 0 0 0
gfd 45 0 0 0 0 0 0
gfd 46 0 0 0 0 0 0
gfd 47 0 0 0 0 0 0
gfd 48 0 0 0 0 0 0
gfd 49 0 0 0 0 0 0
gfd 50 0 0 0 0 0 0
gfd 51 0 0 0 0 0 0
gfd 52 0 0 0 0 0 0
gfd 53 0 0 0 0 0 0
gfd 54 0 0 0 0 0 0
gfd 55 0 0 0 0 0 0
gfd 56 0 0 0 0 0 0
gfd 57 0 0 0 0 0 0
gfd 58 0 0 0 0 0 0
gfd 59 0 0 0 0 0 0
gfd 60 0 0 0 0 0 0
gfd 61 0 0 0 0 0 0
gfd 62 0 0 0 0 0 0
gfd 63 0 0 0 0 0 0
gfd 64 0 0 0 0 0 0
gfd 65 0 0 0 0 0 0
gfd 66 0 0 0 0 0 0
gfd 67 0 0 0 0 0 0
gfd 68 0 0 0 0 0 0
gfd 69 0 0 0 0 0 0
gfd 70 0 0 0 0 0 0
gfd 71 0 0 0 0 0 0
gfd 72 0 0 0 0 0 0
gfd 73 0 0 0 0 0 0
gfd 74 0 0 0 0 0 0
$ onstat -p
IBM Informix Dynamic Server Version 11.50.FC3W1 -- On-Line (Prim) -- Up 01:10:19 -- 921600 Kbytes
Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
9355610 16947434 166184193 94.37 1568001 2150214 6486797 75.88
isamtot open start read write rewrite delete commit rollbk
173486072 3649325 17192634 82339872 730432 30257 463299 941887 35
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 12088.14 2358.88 27 30
bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
550159 79 123453819 0 0 67 150460 120453
ixda-RA idx-RA da-RA RA-pgsused lchwaits
2025249 1361 1499088 3519878 468120

Messages In This Thread

I/O writes
KAMRAN HAQ -- Friday, 17 July 2009, at 9:33 a.m.
- Re: I/O writes
  Art Kagel -- Friday, 17 July 2009, at 10:39 a.m.
  - Re: I/O writes
    KAMRAN HAQ -- Friday, 17 July 2009, at 11:00 a.m.
    - Re: I/O writes
      KAMRAN HAQ -- Friday, 17 July 2009, at 11:06 a.m.
      - Re: I/O writes
        Art Kagel -- Friday, 17 July 2009, at 11:15 a.m.
    - Re: I/O writes
      Art Kagel -- Friday, 17 July 2009, at 11:11 a.m.
      - Re: I/O writes
        KAMRAN HAQ -- Friday, 17 July 2009, at 11:25 a.m.
        
        Re: I/O writes
        Art Kagel -- Friday, 17 July 2009, at 11:36 a.m.

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