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 -- -- Todo mundo deveria ter dinheiro suficiente para fazer uma cirurgia plástica --Beverly Johnson
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