On 13 September 2017 at 12:00, hw <hw at gc-24.de> wrote: >> >> It will depend on the type of SSD. Ones with large cache and various >> smarts (SAS Enterprise type) can take many different sizes. For SATA >> ones it depends on what the cache and write of the SSD is and very few >> of them seem to be the same. The SSD also has all kinds of logic which >> moves data around constantly on disk to wipe level so it makes it >> opaque. The people who have tested this usually have to burn through >> an SSD set to get an idea about a particular 'run' of a model but it >> doesn't go over every version of the model of SATA SSD. > > > Hm, so much to SSDs ... I can only hope they will be replaced with > something better. > > > I have decided against putting anything onto these SSDs other than temporary > data, but even for that, I would need to make an md-RAID, which I don´t > want. > It may work or not, and "may work" is not enough. > May work is part of any commodity hardware build. The SATA hard drives do not use the same technology as 4 years ago and you may end up with them having crap out on shorter lifetimes because they aren't built to live longer than 3 years depending on the model. [It doesn't matter the brand.. they get built with the same tech and at the same place these days.] > If the performance on the hardware RAID isn´t as good, it can not get worse > than it is now, and it may be even better than with the SSDs. > > > I have two at home with the system installed on btrfs. I´m going to change > that > to md-RAID1 and xfs. Is there anything special involved in copying the > system > to another disk? Will 'cp -ax' do, or should I use rsync to copy xattrs > etc.? > Using the commonly used stripe size of 128kb is something I´d expect the > SSDs > being able to handle. > Depending on what CentOS you are working, cp -a will preserve xattrs. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos -- Stephen J Smoogen.