Re: slow USB vtapes

Jose M Calhariz <[email protected]> Wed, 1 Jun 2022 11:04:59 +0100

Newsgroups	gmane.comp.archivers.amanda.user
Message-ID	<[email protected]>

On Wed, Jun 01, 2022 at 07:31:50AM +0200, Stefan G. Weichinger wrote:
> 
> 
> I see low write performance to (modern) USB disks attached via USB 3.0
> 
> This leads to loooong backup windows and even DLEs somehow not written
> because things get stuck (?) somehow.
> 
> Until yesterday the disks were attached to USB 2.0 ports, I expected to
> solve this by adding a PCIe card with USB 3.0 ports.
> 
> Maybe the mount options aren't optimal:
> 
> UUID=3de7b456-019e-40ed-a1b9-aad41d371f26 /mnt/externaldisk7 ext4
> relatime,noauto,user 0 2
> 
> ?
> 
> When I test things by doing something like:
> 
> sync; dd if=/dev/zero of=tempfile bs=1M count=1024; sync
> 
> I get values of maybe 130 MB/s or so, which is OK imo.
> 
> The old internal RAID delivers ~150MB/s (reading from the holding disk).
> 
> But with amanda (3.6.0pre2, btw) the flushes and dumps are slow.
> 
> Does changing some blocksize help with vtapes?
> 
> Sure, old hardware, I know.
>

Hi,

How many DLEs and how many run in parallel (inparallel parameter)?
How fast is your holdingdisk?
What "iostat -k -x 2" command gives when amanda is running?


Kind regards
Jose M Calhariz



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