Wols Lists wrote: > On 27/12/2021 13:40, Michael wrote: >> On Monday, 27 December 2021 11:32:39 GMT Wols Lists wrote: >>> On 27/12/2021 11:07, Jacques Montier wrote: >>>> Well, i don't know if my partitions are aligned or mis-aligned... How >>>> could i get it ? >>> >>> fdisk would have spewed a bunch of warnings. So you're okay. >>> >>> I'm not sure of the details, but it's the classic "off by one" >>> problem - >>> if there's a mismatch between the kernel block size and the disk block >>> size any writes required doing a read-update-write cycle which of >>> course >>> knackered performance. I had that hit a while back. >>> >>> But seeing as fdisk isn't moaning, that isn't the problem ... >>> >>> Cheers, >>> Wol >> >> I also thought of misaligned boundaries when I first saw the error, >> but the >> mention of Seagate by the OP pointed me to another edge case which >> crept up >> with zstd compression on ZFS. I'm mentioning it here in case it is >> relevant: >> >> https://livelace.ru/posts/2021/Jul/19/unaligned-write-command/ >> > that might be of interest to me ... I'm getting system lockups but > it's not an SSD. I've got two IronWolves and a Barracuda. > > But I notice the OP has a Barra*C*uda. Note the different spelling. > That's a shingled drive I believe, which shouldn't make a lot of > difference in light usage, but you don't want to hammer it! > > Cheers, > Wol > >
I don't recall seeing this mentioned but this may be part of the issue unless I'm missing something that rules this out. Could it be a drive is a SMR drive? I recently made a new backup after wiping out the drive. I know the backup drive is a SMR drive. At first, it copied at a fairly normal speed but after a short time frame, it started slowing down. At times, it would do only about 50 to 60MBs/sec. It started out at well over 100MBs/sec which is fairly normal for this rig. I would stop the copy process, let it catch up and restart just to give it some time to process. I can't say it was any faster that way tho. The way I noticed my drive was SMR, I could feel the heads going back and forth by putting my hand on the enclosure. It had a bumpy feel to it. You can't really hear it tho. If you can feel those little bumps even when the drive isn't mounted, I'd be thinking it is a SMR drive. There are also sites that you can look this sort of thing up on too. If needed, I can go dig out some links. Just thought it worth a mention. Dale :-) :-)
