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Re: [K12OSN] Slow performance



On Fri, 11 Nov 2005 bear2bar netscape net wrote:

Hi,

OK here are the specs;

Server
Dual P-III 600 Mhz
2 GB memory
30 GB IDE drive
  ^^^^^^^^^^^^^^^

Given the size of that drive, I assume it is an older parallel IDE
model (PATA). PATA is HORRIBLE in a terminal server. Just say NO to
PATA.

I still recommend SCSI, but am softening up to Serial IDE (SATA).

Over the last couple of days I've been doing benchmarks against a
LSI Megaraid U320-1 SCSI controller with 6 72G 10K SCSI segate drives (~$150 each) in Raid 5 and LSI Megaraid 300-8x SATA controller with 6 400G 7.2k SATA segate drives (~$250) in Raid 5.

The Megaraid 300-8x SATA controller with the optional battery backup
(~$400 for the controller, $150 for the battery) is about on-par with
the bare Megaraid U320-1 SCSI controller (~$200). Add the optional battery backup to the Megaraid U320-1 controller (~$100), and it is ~20-40% faster than the SATA controller/drives depending on the test. (adding the battery backup defaults each controller to a more aggressive write caching algorthm). Both cards use the same driver.

The SATA performance quite impressive, considing the SCSI test system
has smaller, higher RPM drives.

The SCSI setup is slightly cheaper at $1,500 vs SATA's $2,000,
but the storage capacity of the SATA setup is 4.5x greater.

-Eric

100 mb NICs

Workstations (Clients)
Compaq SFF P-III, 600 Mhz
512 MB
100 mb NIC

Cable modem connected to a router with two 100mb switches

Sub-net 1- Windows workstations x 3
Sub-net 2 - 10 Clients
Clients have W2K loaded & get their IP address via the linux server
These same clients also do a network boot to become thin clients on the linux network

Software
K12LTSP version 4.4 with all updates

Problem
Launching applications either on the client or the server is very slow, 24+ sec for a terminal window

TOP shows a minimal load on the processors, max of 24% on one processor for the gnome desktop, 10 - 15% for X, but usually the load is at 2 - 3%

Any ideas or suggestions is greatly appreciated.

thks
norbert


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