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timbrigham@hotmail.com
Guest
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 Posted:
Fri Aug 05, 2005 12:16 am Post subject:
DS300 bottleneck |
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My company recently acquired an IBM DS300 SAN, and a number of IBM
iSCSI HBAs. (Whatever model IBM suggested, my boss bought them so I'm
not sure). Using a HP ProCurve 2824 which was marketed at having Jumbo
frame support. I'm using out of the box settings for the time being,
and the performance is abysmal. I grabbed a number of Outlook archives,
all around ~500 megs each. Two gigs of these files take over three
minutes to move from the SAN to the local hard drive.
Will someone kindly help me find the bottleneck in the system? |
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HVB
Guest
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| Posted:
Fri Aug 05, 2005 12:16 am Post subject:
Re: DS300 bottleneck |
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On 4 Aug 2005 14:12:17 -0700, "timbrigham@hotmail.com" wrote:
<Stuff on iSCSI and IBM DS300 snipped>
| Quote: | I grabbed a number of Outlook archives,
all around ~500 megs each. Two gigs of these files take over three
minutes to move from the SAN to the local hard drive.
Will someone kindly help me find the bottleneck in the system?
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Hey Tim,
Are you using a 100Mb LAN as your iSCSI network? Just a guess.
HVB. |
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timbrigham@hotmail.com
Guest
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| Posted:
Fri Aug 05, 2005 12:16 am Post subject:
Re: DS300 bottleneck |
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| No, the switch (and all the cables) are all gigabit. |
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Rob Turk
Guest
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| Posted:
Fri Aug 05, 2005 8:16 am Post subject:
Re: DS300 bottleneck |
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<timbrigham@hotmail.com> wrote in message
news:1123189937.044929.215950@g43g2000cwa.googlegroups.com...
| Quote: | My company recently acquired an IBM DS300 SAN, and a number of IBM
iSCSI HBAs. (Whatever model IBM suggested, my boss bought them so I'm
not sure). Using a HP ProCurve 2824 which was marketed at having Jumbo
frame support. I'm using out of the box settings for the time being,
and the performance is abysmal. I grabbed a number of Outlook archives,
all around ~500 megs each. Two gigs of these files take over three
minutes to move from the SAN to the local hard drive.
Will someone kindly help me find the bottleneck in the system?
|
You're getting about 11 MB per second. What type of system, O/S and what
type of local harddisk are you using on the client side?? Does copying it
back to the DS300 go any faster?
Rob |
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timbrigham@hotmail.com
Guest
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| Posted:
Fri Aug 05, 2005 4:16 pm Post subject:
Re: DS300 bottleneck |
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My test system is a HP ProLiant DL380, with a single Xeon 2.8 GHZ
processor, and 3 gigs of ram. Both the server and the SAN array are
configured with RAID5.
Apart from some document management software and the SanSurfer
configuration program, this machine has a clean install of Windows
Server 2003 standard edition. Both the C (local) and D (SAN) drives are
configured with NTFS.
As of this morning, the average times are as follows for 2.2 gigs:
~3 minutes to copy from the SAN.
~1 minute to copy to the SAN.
50 seconds to one minute to move ~2.2 gigs of data from |
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timbrigham@hotmail.com
Guest
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| Posted:
Wed Aug 24, 2005 12:16 am Post subject:
Re: DS300 bottleneck |
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Found the problem. The default size caps for the initial and final
transmission lengths were too short. I turned the settings to zero
(off) and the problem is gone. |
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Guest
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| Posted:
Fri Sep 09, 2005 2:17 pm Post subject:
Re: DS300 bottleneck |
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Can you be more specific about the configuration changes you did? Were
they on the iSCSI adapters or the DS300 itself?
Bostjan |
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timbrigham@hotmail.com
Guest
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| Posted:
Thu Oct 06, 2005 9:59 pm Post subject:
Re: DS300 bottleneck |
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FYI:
Under the HBA settings on each server (we are using the SANsurfer
Control iX program with the IBM recommended hardware) I set the maximum
burst length to 0.
bostjan.golob@gmail.com wrote:
| Quote: | Can you be more specific about the configuration changes you did? Were
they on the iSCSI adapters or the DS300 itself?
Bostjan |
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