On Thu, 15 Nov 2018 11:02:08 +0100, David Kastrup wrote: >Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx> writes: > >> On Wed, 14 Nov 2018 16:17:43 -1000, David W. Jones wrote: >>>The speed difference between that $50 spinning disk and an SSD is >>>phenomenal. >> >> It is and nobody should worry about "greatly reduced access speeds", >> if the SSD has got no cache. With the SSDs I mentioned, I can turn on >> the computer and use the display manager's greeter to log in after >> around 2 seconds. > >And your SSD does not have an internal cache? Are you sure about that? Hi, via a link provided by https://ssd.toshiba-memory.com/en-amer/ssd/tr200: " The SSD does not use a DRAM cache, instead it uses a chunk of its NAND cells and invokes an SLC written cache to speed up the majority of writes." - https://www.guru3d.com/articles-pages/toshiba-tr200-ssd-960gb-review,5.html >> This is "reduced access speed" nearly nobody could notice, at least >> not if you migrate from a HDD to such a SSD and neither for averaged >> desktop work, nor for real-time audio work. > >Real-time audio work does not mind disks braking transfer speeds to >Flash speeds, including the pauses for wear management, internal >allocation, block erasure? HDDs do have internal management routines, too. Apart from a damaged HDD, I never experienced a HDD, let alone a SSD, as a bottleneck when doing real-time audio work. For everything I'm using HDDs and SSDs, I either don't notice a different performance, since HDDs are already fast enough, e.g. for real-time audio usage or SSDs are noticeable faster than HDDs, e.g. when launching bloatware. >I've been caught out flat a lot fantasizing about how I'd wanted to >imagine computing to be. I would recommend some restraint distributing >advice on that base. On what SSD experiences do you base your recommendation? I dropped all HDDs for Linux real-time audio, since the SSDs are silent and I'm using an iPAD for real-time audio. Those are my experiences with SSDs. I'm not aware that any issue I experienced with a recent Linux install or my iPad was caused by a SSD and would have not happened when using a HDD. For backups I'm using external HDDs, since they are less expensive and because I don't know how safe a SSD is, when used as a backup drive. I don't know if the OP does expect a scientific investigation. I mentioned my experiences, named the used SSDs and provided information such as "host writes". Regards, Ralf _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
