‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Sunday 28 June 2020 21:29, Matthias Schniedermeyer <m...@citd.de> wrote:
> On 28.06.2020 16:46, Rupert Gallagher wrote: > > > ????????????????????? Original Message ????????????????????? > > On Sunday 28 June 2020 13:58, Matthias Schniedermeyer m...@citd.de wrote: > > destination: > > ST5000LM000-2AN1 sata hdd > > Writing speed : 74 MB/s > > Reading speed : 89 MB/s > > And this HDD is a SMR model(*) on top of beeing a 4k sector model emulating > 512 byte sectors. > So alignment needs to be correct and the filesystems must use 4k sectors. > > This HDD is NOT suitable for beeing used for small files and a hardlink-farm. > > SMR HDDs only reach best performance if used "like a tape drive" with large > and linear writing. > > I use SMR HDDs myself and only use them for "really large" files (>500MB per > file), otherwise they perform very poorly. > I also align my partitions correctly and set XFS to "4k sector"-size. > Which nowadaya means: I use 4k sectors for anything. As i only have been > using 4k sector HDDs for nearly as long as they are on the market (IIRC >1 > decade). > > Also SSDs are usually optimized for 4k sectors too. > > *: > https://en.wikipedia.org/wiki/Shingled_magnetic_recording SMR is the cost we pay for large storage on small space. There is something similar to SMR also for SSD, found in Samsung QVO units. The cost-benefit analysis for 2.5" drives led to this product. Costs are HDD <= SSD < TAPE (HP LTO Ultrium). We are using this disk "like a tape drive", with hardlinks because it can. This is from the current disklabel: bytes/sector: 512 sectors/track: 255 tracks/cylinder: 511 sectors/cylinder: 130305 cylinders: 74959 total sectors: 9767541168 # total bytes: 4.5T This is from the current ffs2: fs block size : 8192 bytes Free disk space : 4713572474880 bytes The values are native, without any tuning. However, the bottom line is that I get the job done in 2 hours via the lan, and 8 hours via the bus... -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
