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тАО01-17-2011 11:19 AM
тАО01-17-2011 11:19 AM
SSH Lag
I've seen this with RHEL5.x on older machines and now again with Ubuntu 10.04.1 LTS on a brand new DL380G7 with 24 cores.
Is there a way I can tweak the ssh daemon to get it to respond bit better?
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тАО01-18-2011 01:51 AM
тАО01-18-2011 01:51 AM
Re: SSH Lag
Is a local console session slow too?
If your system disk is very busy with other tasks, the system's response to commands is likely to slow down, no matter what login method is used.
This is one of the reasons why applications that are expected to have a high disk utilization should have their own disks/RAID sets, separate from the system disk(s).
It might be possible you're experiencing an I/O bottleneck: the system attempts to transfer more data than the bus on the system board can handle, resulting in a situation that is somewhat similar to a traffic jam.
MK
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тАО01-20-2011 08:39 AM
тАО01-20-2011 08:39 AM
Re: SSH Lag
Also, I'm using SATA disks in RAID 5 and the source volume is on RAID 10 SAS volume. (not on the same server)
But still, I expected more from a brand new DL380G7 performance model.
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тАО01-20-2011 01:27 PM
тАО01-20-2011 01:27 PM
Re: SSH Lag
In looking to resolve this issue the first step would be to separate your root partition from you working partition.
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тАО01-24-2011 06:18 AM
тАО01-24-2011 06:18 AM
Re: SSH Lag
Are you syaing your OS/Boot disk is carved out of the same RAID5 set as the filesystem being written to on the same Smart Array Controller?
If Yes - then that is likely your problem. Our standard is either OS is on a SAN Boot disk or if local -- the OS uses the RAID disks exlcievekly on its own -- no data filesystems...