Re: [bareos-users] Re: Restore from tape failed: not enough memory (Ultrium LTO5)

[Andreas Rogge]

Hi Konrad,





Maybe start with "Maximum Block Size = 1048576".



Best Regards,
Andreas

Am 03.08.23 um 14:58 schrieb 'Konrad' via bareos-users:

I would remove the "Minimum Block Size" setting, it usually doesn't help unless you require fixed block sizes (which you don't on an LTO drive). Your current setting for Maximum Block Size limits the buffer size to 524288 bytes. Apparently your backup was written with a larger block size, so reading the block fails. While there is an automatic workaround being implemented in PR #1496 right now it will probably help to simply increase Maximum Block Size. Also, please note that in Bareos 23 the default block size will change in a backwards-compatible manner so that there is no need to configure block sizes anymore.

Dear Andreas,

this is the tape part of my config:


/----------------------------------------------------------------------------------------------------------------------------------------------------------------------/
SD /etc/bareos/bareos-sd.d/device/FileStorage.conf

/Device {/
/  Name = Ultrium3000/
/  Media Type = Tape/
/  Archive Device = /dev/nst0/
/  LabelMedia = no;                   # lets Bareos label unlabeled media/
/  Random Access = no;/
/  AutomaticMount = yes;               # when device opened, read it/
/  RemovableMedia = yes;/
/  AlwaysOpen = yes;/

/  Maximum File Size = 50 G /
/  Maximum Spool Size = 500 G/
/  Minimum Block Size = 524288/
/  Maximum Block Size = 524288/
/  Spool Directory = /media/spool/
/}/
/
/
Director:  /etc/bareos/bareos-dir.d/storage/File.conf

/Storage {
Name = Tape
Address = localhost
Password = "i won't tell"
Device = Ultrium 3000
Media Type = Tape
Autochanger = no
Maximum Concurrent Jobs =1
}/
/----------------------------------------------------------------------------------------------------------------------------------------------------------------------/

/  Description = "Tape device. A connecting Director must have the same Name and MediaType."/ BTW: I am using Bareos 22, all services are located in a Proxmox VM, Ubuntu 22.04.2 LTS, PCIE passthrough of SAS card I added the last five lines of the device config to deal with performance issues according to https://www.bareos.com/whitepapers/optimizing-the-tape-speed.pdf

/media/spool is a ramdisk, during that backup mounted with 20GB.

Kind Regards

Konrad

On Saturday, July 29, 2023 at 4:48:57 PM UTC+2 Konrad wrote:

    Hi,

    i recently moved from disc to tape backup with bareos, so my
    experiences regarding restore are limited to testwise restoring some
    files and directories.
    Moving to another raid, I am trying to restore the whole backup to
    the new set of discs. Some folders restore ok, but when I want to
    restore the whole set, I encounter the following error:
    "bareos-sd JobId 18: Error: stored/block.cc:981 Read error on fd=5
    at file:blk 0:1 on device "Ultrium3000" (/dev/nst0). ERR=Nicht
    genügend Hauptspeicher verfügbar."

    I tried to research and think this is because of mismatching block
    size, but the block size is fixed in bareos. I use the same install
    to restore, that was used for backup.

    FileStorage.conf:
    /Minimum Block Size = 524288
       Maximum Block Size = 524288/

    I would appreciate to get some hints on how to get on. I am loosing
    faith in my backup :-(

    Konrad

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Andreas Rogge                             andreas.ro...@bareos.com
  Bareos GmbH & Co. KG                      Phone: +49 221-630693-86
  http://www.bareos.com

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