On Friday 20 June 2014 19:48:14 Kai Krakow wrote: > microcai <micro...@fedoraproject.org> schrieb: > > rsync is doing bunch of 4k ramdon IO when updateing portage tree, > > that will kill SSDs with much higher Write Amplification Factror. > > > > I have a 2year old SSDs that have reported Write Amplification Factor > > of 26. I think the only reason is that I put portage tree on this SSD > > to speed it up. > > Use a file system that turns random writes into sequential writes, like the > pretty newcomer f2fs. You could try using it for your rootfs but currently I > suggest just creating a separate partition for it and either mount it as > /usr/portage or symlink that dir into this directory (that way you could > use it for other purposes, too, that generate random short writes, like log > files).
Well, there's a surprise! Thanks for mentioning f2fs. I've just converted my Atom box's seven partitions to it, recompiled the kernel to include it, changed the fstab entries and rebooted. It just worked. --->8 > I'd also suggest not to use the discard mount options and instead create a > cronjob that runs fstrim on the SSD devices. But YMMV. I found that fstrim can't work on f2fs file systems. I don't know whether discard works yet. Thanks again. -- Regards Peter
