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Copy Slow.

Copy Slow.

Created: Sep 14, 2021 11:01:00Latest reply: Sep 14, 2021 11:32:22 215 2 1 0 0
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Hi,

Customer want to use it to store backups. The time of backup is very logs and sometimes it freezes with errors. Customer opened a SR to Veem. They replied that the issue with read data from storage. Customer performed test. No issues with write operations. But when  read data from storage the reading process freezes on the OS, or tries to copy on a very low speed - 355KB/s and then freezes.

What's the Solution ?

Thanks!


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little_fish
Admin Created Sep 14, 2021 11:32:22

Dear Abdussamed,


1. Check the captured packet and analysis one request, host frequently sends ACK messages to storage but the feedback packet from Storage doesn’t reach the host. The storage device keeps retransmitting TCP packets during the period.


2. After 60s, host RST disconnects TCP connection. The feedback packed should be drop on the link and cause that issue.

3. The MTU configuration is not the same on switch and storage.

4. It solve the problem after modifying the MTU as 1500 on the switch.


Thanks.

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little_fish
little_fish Admin Created Sep 14, 2021 11:01:32

dear friend we are working on it now.
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little_fish
little_fish Admin Created Sep 14, 2021 11:32:22

Dear Abdussamed,


1. Check the captured packet and analysis one request, host frequently sends ACK messages to storage but the feedback packet from Storage doesn’t reach the host. The storage device keeps retransmitting TCP packets during the period.


2. After 60s, host RST disconnects TCP connection. The feedback packed should be drop on the link and cause that issue.

3. The MTU configuration is not the same on switch and storage.

4. It solve the problem after modifying the MTU as 1500 on the switch.


Thanks.

View more
  • x
  • convention：
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