Change TFTP Block Size

[HERMANN PUTZ]

Hello all,

we have poor performance for loading our boot images over DSM BootServer. (v14, but was bad in 12.9, 12.8, ...). Our boot image is ~200MB (win10) and it took 7-10min to load over network. My workmate from network team told me that an bigger tftp blocksize will speed up the transfer. I know the settings "TFTP blocksize limit" and "TFTP specific blocksize limit" (both 65464). Or there other settings that impact the block size?

 

Thanks, Hermann

 

[Jean-Yves Guiblet]

Hello Hermann,

 

The default TFTP blocksize liimit used by ITCM is 65464 bytes.

But I think it is the max size limit for TFTP block according to RFC 2348 :

 

RFC 2348 - TFTP Blocksize Option 

 

"#octets The number of octets in a block, specified in ASCII. Valid values range between "8" and "65464" octets, inclusive. The blocksize refers to the number of data octets; it does not include the four octets of TFTP header."

 

There is another ITCM parameter used for sending TFTP blocks :

 

DSM/Scalability Server/OSIM/ManagedPC/Back off time after TFTP send

 

 

 

This is a number of milliseconds to wait between 2 sending of a TFTP block.

By default there is no delay (=0)

 

 

But I think solution described in this technical document may resolve your problem :

 

Slow Image Deployment via TFTP 

 

 

You could increase the TFTP blocksize specified in file sdmpcimg.ini which is by default defined to 1456 bytes

 

Example :

 

[TFTP]
blocksize = 16384

 

Thanks.

Regards,

Jean-Yves

[HERMANN PUTZ]

Hello Jean-Yves,

thanks for your help, will change sdmpcimg.ini and try.

 

Hermann

 

 

 

 

 

 

Von:    guije03 <[e-mail]>

An:     HERMANN PUTZ <[e-mail]>

Datum:  07.07.2017 23:07

Betreff:        Re:  - Re: Change TFTP Block Size

 

 

 

 

CA Communities

 

Re: Change TFTP Block Size

reply from JY GUIBLET in CA Client Automation - View the full discussion

 

Hello Hermann,

 

The default TFTP blocksize liimit used by ITCM is 65464 bytes.

But I think it is the max size limit for TFTP block according to RFC 2348

:

 

RFC 2348 - TFTP Blocksize Option

 

"#octets The number of octets in a block, specified in ASCII. Valid values

range between "8" and "65464" octets, inclusive. The blocksize refers to

the number of data octets; it does not include the four octets of TFTP

header."

 

There is another ITCM parameter used for sending TFTP blocks :

 

DSM/Scalability Server/OSIM/ManagedPC/Back off time after TFTP send

 

https://communities.ca.com/servlet/JiveServlet/downloadImage/2-241991425-127679/pastedImage_4.png

 

 

 

This is a number of milliseconds to wait between 2 sending of a TFTP

block.

By default there is no delay (=0)

 

 

But I think solution described in this technical document may resolve your

problem :

 

Slow Image Deployment via TFTP

 

 

You could increase the TFTP blocksize specified in file sdmpcimg.ini which

is by default defined to 1456 bytes

 

Example :

 

 

blocksize = 16384

 

Thanks.

Regards,

Jean-Yves

 

 

Reply to this message by replying to this email, or go to the message on

CA Communities

Start a new discussion in CA Client Automation by email or at CA

Communities

Following Re: Change TFTP Block Size in these streams: Inbox

You are receiving this email because you are a member of the CA

Communities.

If you'd like to change your email preferences, click here. If you want

your communities account to be deactivated (opt out), please send an email

to [e-mail].

Additionally, if you wish to opt out of all unsolicited commercial

communications from CA Technologies, click here.