AIX

AIX

Connect with fellow AIX users and experts to gain knowledge, share insights, and solve problems.

 View Only
Back to discussions
Expand all | Collapse all

system slows down during to cp or backup

  • 1.  system slows down during to cp or backup

    Posted Wed January 13, 2010 07:42 AM

    Originally posted by: soumyapaul


    hi,
    I've a P550 server(4 CPU, 24GB Memory). During any file copy or tape backup system become very very slow, IO becomes high. Can any body help me in this regard.
    I've tried the copy in different disks but result is same.

    Please find the vmstat output below

    kthr memory page faults cpu
    -----------
    ------------
    r b avm fre re pi po fr sr cy in sy cs us sy id wa
    0 58 4086739 4155 0 80 646 19464 85255 0 2546 22007 4055 3 14 41 42
    0 51 4094341 4455 0 280 788 6710 11256 0 1139 10464 1896 3 4 46 47
    3 49 4097656 4096 0 263 2722 20110 37929 0 3192 22347 4208 3 15 41 41
    0 45 4097785 4162 0 126 2383 18876 71186 0 3065 22709 4570 3 16 40 41
    1 43 4097756 2996 0 103 1775 19096 53998 0 3242 23046 3843 3 14 41 42
    0 49 4097769 3025 0 62 2820 13926 30179 0 3327 15387 4549 2 11 43 44
    Regards,
    Soumya


  • 2.  Re: system slows down during to cp or backup

    Posted Fri January 15, 2010 02:13 AM

    Originally posted by: SystemAdmin


    The reasons for this could be many. First of all when you say slow.....how "slow" does the server really become?

    If backup is run with compression option then that will take CPU cycles. How is your disk subsystem configured? Is the I/O well distributed over the disks? Are there multiple controllers? Are there other activities going on on the same disk leading to disk contention (the I/O wait time is high)? How are the I/O buffers, jfs filecaching, memory parameters configured? If you are using SAN, is there contention in there? Are the filesystems jfs or jfs2?

    And the list goes on.... But these are some of the items you could look into.

    r/
    R


Related Content