[BETA2] Snapshot overflow

Backup agent for Linux servers and workstations on-premises or in the public cloud

[BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Mon Sep 05, 2016 7:39 am

Hello,

I want to Backup a server based on UCS (Whezzy) to a remote share. The installation is working fine. The job can create successfull.

When the job is running 4-5 Minutes the job is "failed".

Code: Select all
     2016-09-05 09:31:15 Job started at 2016-09-05 09:31:15
     2016-09-05 09:31:15 Starting backup
     2016-09-05 09:31:15 Creating volume snapshot                                                   00:00:01
     2016-09-05 09:31:19 Backing up BIOS bootloader on /dev/sda                                     00:00:02
     2016-09-05 09:31:21 Backed up /dev/sda 489.1MB at 55.4MB/s                                     00:00:09
     2016-09-05 09:33:21 [error] Backing up vg_ucs 1.7GB at 70.2MB/s (1%)                           00:01:45
     2016-09-05 09:35:14 [error] Snapshot overflow.
     2016-09-05 09:35:14 [error] Failed to upload disk.
     2016-09-05 09:35:14 [error] Agent failed to process method {DataTransfer.SyncDisk}.
     2016-09-05 09:35:14 [error] Exception from server: Snapshot overflow.
     2016-09-05 09:35:14 [error] Unable to retrieve next block transmission command. Number of al...
     2016-09-05 09:35:14 [error] Failed to download disk.
     2016-09-05 09:35:14 [error] Failed to perform backup
MyKey0815
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Mon Sep 05, 2016 11:06 am

Hi,

What kind of a remote share do you use, is it SMB or NFS? Could you please try to run the backup one more time and see of the error repeats? Please double-check that no disconnection of the share occurs during the backup.

Thanks
PTide
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Wed Sep 07, 2016 11:05 am

I try it agin. Same error again, sorry.

Can you tell me, how can i check the connection/disconnection of the share? Do you know a tool that i can make a stresstest? I dont have a idea?

Thanks for help
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Wed Sep 07, 2016 11:29 am

Can you tell me, how can i check the connection/disconnection of the share?
Try to copy any file to the share right after the backup has failed. If the share is disconnected then copy operation should fail.

Do you know a tool that i can make a stresstest?
Try to copy /usr/src directory to the shared folder and see if it works.

Also please share an archived /var/log/veeam directory so we can review logs.

Thank you
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Wed Sep 07, 2016 3:15 pm

Thanks for your reply.

i have test it again. Direct after the error i try to copy some files to the share. It works fine. All files can be copied to to share.

Now i have the whole /var/log/veem Folder attached in this link
https://we.tl/IK3PrmDgen
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Thu Sep 08, 2016 12:39 pm

So, what's the type of the share that you use? Is it Windows share?
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Thu Sep 08, 2016 12:55 pm

No, it´s a Samba4 (4.1.13-Ubuntu) Share with following definition:

Code: Select all
[veeam]
   comment = Veeam Datensicherungs Freigabe
   path = /HDD/SDA252_4000G/Veeam
   browseable = yes
   read only = no
   guest ok = yes
   writeable = yes
   force directory mode = 2770
   create mask = 0644
   directory mask = 2777
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Thu Sep 08, 2016 2:29 pm

Do any files appear on the share during the backup?
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Thu Sep 08, 2016 3:37 pm

PTide wrote:Do any files appear on the share during the backup?


Yes. The directory and a file (named: Backup_Full_2016-09-08T040016.vbk) is created. The file is 960.470 KB size
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Thu Sep 08, 2016 3:54 pm

Do you see any .vbk files on the UCS server?
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Thu Sep 08, 2016 4:01 pm

In which directory i must looking for this file? Do you mean with "UCS Server" the Source Server that should be backuped?
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Thu Sep 08, 2016 4:28 pm

Do you mean with "UCS Server" the Source Server that should be backuped?
Yes.

In which directory i must looking for this file?
Somewhere under /tmp, there should be "veeam" directory inside.

My assumption is that Samba got disconnected in the middle of the proccess therefore the session continued to transfer data right to the same device where vg_ucs is located causing the snapshot to overflow. Another possible reason for overflow is a very high data change rate, that can be resolved if you set up a higher snapshot size limit.



Thanks
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Fri Sep 09, 2016 9:52 am

I have start a new try.

When the job is failed I found in a file in /tmp/veeam/192.168.3.252veeam/ucs003090 Backup_Full.

Code: Select all
960484 -rw-r--r-- 1 nobody nogroup 983528448 Sep  9  2016 Backup_Full_2016-09-09T114705.vbk
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Re: [BETA2] Snapshot overflow

Veeam Logoby PTide » Fri Sep 09, 2016 10:48 am

Ok, so that piece of backup tells me that for some reason veeam has not managed to write to samba share. Let's check if that happened due to a lack of permission, could you please change permissions so anyone would be able to write to the share and modify files that are already there, and start backup afterwards?

Thanks
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Re: [BETA2] Snapshot overflow

Veeam Logoby MyKey0815 » Fri Sep 09, 2016 11:22 am

They can write to the samba share. The first 960MB will written to the share - they are still on the network.

The permissions is set to Everyone
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