i am having problem with a RHEL3 server that are experience very heavy ftp transaction a a certain period of time in the morning, the load average will go to 100+ and there will be problem to access filesystem on SAN storage, which the ftp process is accessing.
looking at the kernel parameter below, what setting can be tune to improve the I/O performance of the server, the SAN is HP 1024 and disk is manage buy VXVM.
Last edited by Yogesh Sawant; 03-26-2009 at 06:09 AM..
Reason: added code tags
Wow. What FTP server are you using? Is it ProFTPd or something else? What authentication policy is it using? If it is using PAM, what PAM modules are being processed?
Second, bump up sar monitoring. Here's what I have in my crontab (/etc/cron.d/sysstat):
In order for the "-d" option to take effect, you might need to remove the old sa files in /var/log/sa. Then hup the cron daemon (pkill -1 crond). After a day, then you can use "sar" to report on the statistics:
for just the disk i/o. You might find your culprit there. If not, the post sar -A. THEN we can look at tuning.
Hi everyone,
I am trying to prevent the ehci_hcd kernel module to load at boot time.
Here's what I've tried so far:
1) Add the following line to /etc/modprobe.d/blacklist.conf (as suggested here):
2) Blacklisted the module by adding the following string to
3) Tried to blacklist the module... (0 Replies)
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Hi gurus
Could anybody tell me which file is read by kernel to set its default system kernal parameters values in solaris. Here I am not taking about /etc/system file which is used to load kernal modules or to change any default system kernal parameter value
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supermicro(dual core) server getting rebooted after "decompressing the kernel;booting the kernel" message comes.
I tried giving acpi=off to the kernel command line but same problem.It shows everything ok and no problem with memory and processors and power supplies.Wt could be the reason?
It has... (1 Reply)
Hello there:
I know that exist a procedure to convert an OS using 32bits kernel to 64 bits kernel. But, exist a procedure to convert an OS using 64bits to 32 bits kernel?
Please help me.
Regards. (2 Replies)
Hi All,
Is there a max number of slabs that can be used per kernel module? I'm having a tough time finding out that kind of information, but the array 'node_zonelists' (mmzone.h) has a size of 5. I just want to avoid buffer overruns and other bad stuff.
Cheers,
Brendan (4 Replies)
hi all!
i have developed a mechanism in system.c to count how many times each kernel call is called. The results are held in an array in system.c . What i want to do is to create a new kernel call which will print this array. I need help in passing the array from system.c to the new kernel call. ... (5 Replies)
ok so I just installed fedora core 6 on my dell inspiron 700m and I go to boot into linux and I get this error. Has anyone seen this before?
I also had XP Pro and Vista installed on this pc prior to putting fedora core 6 on the machine. I'm trying to setup a triple boot system.
Please Help... (2 Replies)
Again same issue with new kernel 2.6.18.1
root@world # iptables -L
modprobe: QM_MODULES: Function not implemented
modprobe: QM_MODULES: Function not implemented
modprobe: Can't locate module ip_tables
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