System slow down, login delay, slow apps

I am running an xserve 2.8 quad core Intel Xeon with OSX 10.6.8. I have 350 users connecting from labs, all workstations are intel iMacs os 10.6.8. Users login fine during periods of quiet on the network, but when 2 or 3 classes login simultaneously the wait time for logins increases to 1 to 2 minutes. During this time if a teacher tries to open a powerpoint presentation from her home folder, the spinning beach ball takes over, even when that quits, there are long delays between slides. I have discovered that if the users login to a local account and then access their home folder by using the "Connect to server", the performance is much better.
The students are all put into groups and utilize the group folder and group folder drop box. The network guys claim that network throughput and traffic peaks are well within the capabilities of the network, and the cpu usage on the server constantly stays below 20%, it has 12 GB of RAM installed. The three terabyte drives are arranged in RAID5. The question is "where is the bottleneck"

Thank you for responding. I am trying to gather some information. With 48 connections the disk activity is mostly writing data vs. reading, maxing out at 27 MB/sec. Disk usage shows 186 GB free as this is the beginning of the semester. During this time I copied a 4.32 GB file from my workstation to the server in 6 min and 15 sec. During that copy, the disk activity averaged around 17 MB/sec.
The network guys are going to try putting all the Macs on a VLAN over the weekend just to see what happens.

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    Have you included the use of other utilies to check your HD? Drive Genius, Disk Warrior, TechTool Pro.No Norton utilities allowed.Hope this helps as there are a lot of places to look for the problem.

  • System gradually slowing down?

    I hope I'm not picking up a topic which has been discussed a gazillion times, but I couldn't find my specific questions after doing some searches. There's a few things I won't to clear about Mac OS.
    I have a MBP 2009 with 4GB mem and 500GB HD. It still runs smoothly however it defenitly runs slower than in the beginning. I guess that's a bit normal (more programs, files, mails, junk,...).
    I've been a PC user most of my life and switched about a year ago. i'm happy. I always found it necessary to do a reinstall of the OS on a pc every 1-2 years (even though I try to keep my stuff very clean). I'm curious how this effects on Mac OS?
    If I would do a reinstall, let's say from a Time Machine Backup (so with all my files, programs, mails, settings etc.), would the system run exactly the same or are there some core OS operations that will run 'smoother' after a re-install (with a TM backup). (I guess for a PC that would be a clean registry and not having 'unknown' processes/programs loading at the back).
    Also, is having installed a lot of applications (even when they are not running) slowing down the system. I guess it shouldn't as long as there's enough disk space.
    And then finally, do disks slow down after a while. Is having a 10% full HD (much) faster then 60% full (mine is around 60%). also disk defrag is no longer 'necessary' in the latest versions of Mac OS but I just can't imagine that after +1y heavy usage some files are "spread out".. (I'm no expert on file systems so I could expect an answer as: "no, EXT FS doesn't have fragmentation"
    Anyways, these are a few doubts I still have around a Mac OS system slowing down:
    -reinstall OS (this one particularly since i'm thinking of upgrading to new laptop, and wonder if I should start from scratch and copy manually or use my Time Machine backup to reinstall)
    -having many apps (not running)
    -disk fragmentations, or just hardware slowing down
    cheers!
    Philippe

    If you have not already done so, run Disk Utility's "Verify Disk" & "Repair Permissions" steps on your HD. All utilities that do permissions repairs use exactly the same built-in function of the OS to do so, so it doesn't matter if you do this through Onyx, Disk Utility, or Disk Warrior.
    The verify/repair disk step is a bit different: all utilities use the same method of detecting file system errors but (for example) Disk Warrior rebuilds file system directories from scratch (including perfectly useable ones), which often can repair damage Disk Utility can't, & has a side benefit of simplifying directory structures. Once, back when HD's were much slower & less sophisticated than they are now, this could make a large difference in file system performance. Now, it is debatable that an otherwise OK directory structure would show a noticeable improvement.
    IOW, if your HD's file system is healthy or only has minor problems, Disk Warrior won't do much of anything of real value that Disk Utility can't, but it can be a lifesaver if Disk Utility can't repair certain kinds of problems it can detect.
    The same is true for file fragmentation -- unless the drive is full of very fragmented files, defragmenting it probably won't show much real world improvement.
    The number of inactive applications on your Mac makes almost no difference in performance. What can easily do so is the number of active processes running at any given time. As a former PC users, you may not fully appreciate the difference between quitting an app & closing all its windows. Closing all an app's windows is somewhat like old TSR (terminate & stay resident) DOS programs -- it is still using some system resources, although not as many as when it is active. So, if you aren't already doing so, remember to quit applications you do not plan on reusing for a while.
    Just as importantly, don't load down the OS with a lot of unnecessary add-ons, especially ones that modify the user interface in some way. Each of these things uses some system resources; a few can destabilize the OS, causing recoverable code exceptions you may not be aware of without searching through system logs but still creating extra work for the CPU.
    If or when you remove add-ons or applications, be sure to check the documentation for the proper way to do that. If you don't, you may leave behind files that impact performance.

  • Extremely slow address completion in Mail.app and general systems freeze

    Hello all,
    Since the middle of last week I suddenly experienced
    a extreme slow down of Mail.app address completion,
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    Then Mail.app use nearly all system disk ressources: 'ls' in a terminal
    takes forever to complete, safari stops responding, etc... my Mac
    is unusable. I got into situation where i couldn't force-quit
    or ps/kill -9 any process,... reminiscent of a PC nightmare.
    In addition some mail messages are painfully slow to display,
    the problem seems to occur on some specific messages and does
    not go away when completion is disabled.
    This happens it seems, but I am not 100% sure, after I recieved
    mails with with strange accentuated charaters and ';' in some
    CC addresses.
    I go the zombie AddressBookSync problem described
    http://discussions.apple.com/thread.jspa?messageID=8380028
    starting addressbook then Mail.app as suggested by on user
    solved the zombie problem, but not the completion problem
    and the system is still somewhat slugish. I got a 4GB 2.4Ghz
    imac. Neither my mail nor any disk item substancially increased
    last week.
    Now there is something strange. I tryed to remove putative
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    does it at nerve breaking turtle speed), where are the
    completed addresses taken from???
    Has any one experience this problem? Any idea?
    Thank

    When I attempt to open Mail.app Preferences, the app freezes
    Launch the Console application in any of the following ways:
    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
    The title of the Console window should be All Messages. If it isn't, select
    SYSTEM LOG QUERIES ▹ All Messages
    from the log list on the left. If you don't see that list, select
    View ▹ Show Log List
    from the menu bar at the top of the screen.
    Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
    ☞ The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
    Please don't indiscriminately dump thousands of lines from the log into this discussion.
    Please don't post screenshots of log messages—post the text.
    ☞ Some private information, such as your name, may appear in the log. Anonymize before posting.

  • Does locked documents in sm12 can cause system to slow down in reading

    hi experts,
    When I check locked entries in sm12, i found some locked entries which are already past 8 hours and sometimes more. Do those entries contribute to the system's slow performance? When should I delete those entries? I hesitate to delete locked entries and kick users out of the system because they maybe editting some documents and have'nt saved them yet.
    Thank you in advance for your response.

    Hello,
    System Lock mechanism doesn't slow down system. But sometime it's required to delete the entries of hanged uses login processes, which can be done through SM04/AL08 as described by GURUS.
    But sometime though you try to delete from these T-Code the process doesn't get delted, then you can proceed for the below mnetioned two steps:
    1. SM50 and delete the corresponding process through PROCESS > CANCEL WITHOUT CORE
                                                                                    PROCESS > RESTART AFTER ERROR -> NO
    2. If you have access to OS level, then the same can be deleted by following command:
                                                                                    kill -9 <process no.>
    In case any issue, please feel free to revert.
    Reagrds,
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  • Does re-installing system slow down the HD?

    Hi
    My MBP came back from repair with a new HD and OS 10.5 already installed. For various reasons I might want to wipe it and re-install the system software. But does this process of re-installing the system leave any 'debris' on the drive which might slow down performance in the long run? If so I may leave it, but it's a question I've always wondered about - when you re-install does the drive go back to being 'like new' again or is there a gradual accumulation of code which just adds more clutter?
    Thanks for any help
    John

    If the OS or an app or whatever needs 10GB (for example) of free space, what does it matter if it's 10GB out of 100GB or 10GB out of 1TB?
    I don't think it matters.
    I thought that's what MacRS4 is saying
    I did not understand it to be. The assertion was:
    The 85% corruption thing fassumes a relationship of the largest file types to the size of the physical drive.
    It does not. It assumes that the directory expansion varies with the total amount of data that needs to be stored. The 85% refers to the smallest amount of contiguous disk capacity needed to permit the file system to lay down new pieces of the Extents Overflow file. That does not have to do with the size of any individual file but with the total amount of data that needs to be accommodated in the file system/directory.
    this question seems to asd for just the opposite, a rationale as to why a percentage would be needed, not a set amount of space.
    My intention was to suggest there was a relationship (read percentage) between the total amount of data on the drive and the size of the filesystem. On a 100 GB HDD the filesystem will be smaller as the amount of data stored occupies a smaller amount of disk capacity. On a 1 Terabyte HDD 85% of total used capacity requires a corresponding size of directory. As I understand it the size of the directory varies in direct relationship with the amount of data stored on the drive and not to the total capacity of the HDD. The Micromat study (sorry, I have lost the link for that reference) found that the optimal capacity was 85% to avoid directory corruption.
    As I noted in earlier posts, the equation may have changed with the advent of larger capacity drives, but I am not aware of documentation to that effect. I should also add that I am not by any means an expert. However, I am not willing to test to see how crowded my HDD has to be before I encounter an unrecoverable directory.
    My asking for support for statements made is not by way of debate. I earnestly seek to learn more about this and other subjects from those who have information I do not, myself, have.
    cornelius

  • System slowing down

    Hello,
    I am still on OS X 10.3.9 and it has always worked smoothly for me. However, for the past few days or so, I have noticed a general slowing down of my system. Apps open slower, browsers too, screen saver is slow to stop when I get back to work, etc. I've verified and repaired permissions, and it's not better. The only thing I can remember doing is downloading and installing Yahoo Messenger and realized that it was for OSX 10.4 My Mac didn't like that so much, but as I said, I went through repair after that.
    Any ideas of what's going on? I have tons of memory available, so that's not it. Would anyone have suggestions?
    Thanks ahead.
    Z

    Look at these links.
    Where did my disk space go?
    http://www.macfixitforums.com/showflat.php?Cat=&Board=Forum38&Number=770243
    Download & use WhatSize described in this link.
    Freeing space on your Mac OS X startup disk
    http://www.thexlab.com/faqs/freeingspace.html
    Amazing Disappearing Drive Space
    http://www.pinkmutant.com/articles/TigerMisc.html
    Increase HD Free Space
    http://macosx.com/forums/howto-faqs/275191-how-easily-increase-hd free-space-laptop.html
    How to free up my disk space
    http://www.macmaps.com/diskfull.html
     Cheers, Tom

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