Dear Antonio,
> For an errorless, buffered copy (not direct access) like the one you are > doing, you may try increasing the --cluster-size to 256 or 512, but most Setting the cluster size to 256 improved things a bit, but it was 512 that really made a difference. I'm even trying with 1024 (hope it is safe), and it's also a bit better but not by a lot. > probably the bottleneck is in the sustained writing speed of the destination > partition. I assume so too, but when I did the first ddrescue copy (/dev/sdb1 to sdb1.img), it was an almost identical config, except the original machine was even older! > > At 250 MB/s your drive seems faster than mine (25 MB/s), but not fast enough > if your partition has 500 TB (12 days x 500 MB/s). > Well, that's quite close to our scenario, copying RAID to RAID over a 10G connection. That's why it's a bit scary to let it run so many days and then find out some setting was wrong, but your reply was reassuring :) > > Best regards, > Antonio. Thanks a lot and all the best, Alex
