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Thread: release of memory

  1. #1

    Unhappy release of memory

    Hi,

    I have a memory usage problem on the clients where a backup will use all the free memory available to perform the backup, but then fails to release that memory after the backup process is completed. I thought it was the version i was using 3 Years old. I have since upgraded to latest client & backup, with the same results.

    OS-RH AS4 With all RHN updates
    amanda-backup_server-2.5.2p1-1
    amanda-backup_client-2.5.2p1-1

    Limited text on this issue. Can someone help please??

    Brandon

  2. #2
    Join Date
    Oct 2005
    Posts
    1,559

    Default

    Quote Originally Posted by brandons View Post
    Hi,

    I have a memory usage problem on the clients where a backup will use all the free memory available to perform the backup, but then fails to release that memory after the backup process is completed. I thought it was the version i was using 3 Years old. I have since upgraded to latest client & backup, with the same results.

    OS-RH AS4 With all RHN updates
    amanda-backup_server-2.5.2p1-1
    amanda-backup_client-2.5.2p1-1

    Limited text on this issue. Can someone help please??

    Brandon
    Please provide more information. What is the amount of memory (physical + swap) available on the client?

    Please post the dle entries for the client. Information from client logs will
    be also useful. How big are the DLE filesystems?

    One suggestion - Take a look at the spindle parameter in the disklist configuration file. [url]http://wiki.zmanda.com/index.php/Amanda#DISKLIST_FILE[/url] or man amanda.

    Paddy

  3. #3

    Post max mem or client

    Hi Paddy,

    Thanks for trying to help out.

    I have attached the info you asked for.

    I will have a look at the link you gave.

    thax

    Brandon
    Attached Files Attached Files

  4. #4

    Default Client still Maxes out

    paddy,

    I set the spindle to 1

    server.domain.com /ServerScripts comp-queue-tar 1
    server.domain.com /usr/local comp-queue-tar 1
    server.domain.com /etc comp-queue-tar 1
    server.domain.com /opt comp-queue-tar 1
    server.domain.com /var comp-queue-tar 1

    Same effect the mem usage few upduring the backup and has stayied up after, does not come down.

    Note: that this is purely an amanda client the amanda server is on another server altogether.

    All clients experience the same syntomums except for the backup server.

  5. #5
    Join Date
    Nov 2005
    Location
    Canada
    Posts
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    Default

    There is no problem, it's normal on linux to have a lot of memory in buffers/cached
    It also say that there is 876412 free memory in buffers/cache.
    This memory will be available when you need it.

    It's normal for amanda to use a lot of cache, but it's not a problem.
    Thanks to linux for it's cache, it really help.

  6. #6

    Default

    Hi martineau,

    Thanks for this, but if what you say is true why doesn't the mem in use drop after the backup completes such as in my client when i do a free?

    free
    total used free shared buffers cached
    Mem: 1034604 1000332 34272 0 167100 675040
    -/+ buffers/cache: 158192 876412
    Swap: 2031608 192 2031416

    Brandon

  7. #7
    Join Date
    Nov 2005
    Location
    Canada
    Posts
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    Default

    The memory of a process is freed, but not the cache because it can be needed.
    The cache will be freed only if you request memory.
    read linux documentation, i'm not qualified to explain it.

  8. #8
    Join Date
    Oct 2005
    Posts
    1,559

    Default

    Quote Originally Posted by brandons View Post
    Hi martineau,

    Thanks for this, but if what you say is true why doesn't the mem in use drop after the backup completes such as in my client when i do a free?

    free
    total used free shared buffers cached
    Mem: 1034604 1000332 34272 0 167100 675040
    -/+ buffers/cache: 158192 876412
    Swap: 2031608 192 2031416

    Brandon
    Please see [url]http://sourcefrog.net/weblog/software/linux-kernel/free-mem.html[/url]
    for an explanation.

    Paddy

  9. #9

    Thumbs up Cheers

    Many Thanks to both of you for your quick and helpful responces.

    I am glad to know that its not an amanda bug or any wrong configuration on my part.

    Brandon

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