Michael, Great info...Thanks! Are there any performance (or other issues) between a raid1with two 1tb msata ssds and rsync between one 1tb msata ssd and 7200 rpm 1tb hdd? I like the idea of raid1 with two ssds, but not sure if I am ready to buy 2 1tb ssds. And yes, I really need a 1 tb drive.....Just consider me a hoarder of data...;) Mark On Sep 3, 2014 8:39 AM, "Michael Butash" wrote: > On 09/02/2014 10:23 AM, Mark Phillips wrote: > > I am looking at a new Linux laptop, and I have the option of a mSata SSD > drive or a conventional drive. I am considering a 1 TB Samsung 840 EVO > mSata SSD for the OS and all my partitions. > > 1. Are there any reasons not to use a SSD for the full disk, as opposed > to just for the OS? Other than saving money, as a small SSD would cost a > lot less! > > None I can think of, I do this with mine. I slice out root, var, var/log, > usr, and home to lvm's, usually adding another dump slice under /mnt for > "everything else" including vm images and such across the whole disk. I do > not however provision all the vg space, reserving it for another slice, > lvextending, etc case I run out of space elsewhere. > > > 2. I have seen recommendations on the net to backup the drive to a > spinning drive. The laptop has a couple of bays, so I could put a back up > drive in one of the bays. Does this make sense, or have SSDs matured enough > that they will last like a spinning drive? > > You'll want to do the optimizations still. I have a pretty complex setup > I have to build at an initrd usually outside of installers, aligning > blocks/chunks across disparate filesystems from mdraid, cryptsetup, lvm, to > ext4. I don't use trim (cryptsetup vulnerabilities), but it's possible to > do full-stack traversal like that apparently. > > See also: > http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/ > > > 3. Anything else I should be aware of when moving to the world of SSDs? > > Yes, they die. Often in my experience. I never NOT raid1 them now. My > first I thought it'd be cool to raid0, and holy crap it was fast. Then one > (thus all my data) died after 2 months. Raid1 ftw from here out. I have > way too much proprietary data to not keep it resilient (mdadm), keep it > secure (cryptsetup), and keep it flexible (lvm). > > I've used them from the first gen sandforce and micron chips, they all die > at some point. Most lasting recently was my old adata sandforce2+ drives, > but one would randomly fall out of raid, but this could have also been my > mobo sucking (intel p65, with the oob crap southbridge). > > Along the way I perfected my install to the point the ssd's keep lasting > longer, so I like to think it's that, but really not sure if hw is getting > better, or I'm better at not slaughtering them with io. > > I'm currently using 2x mx100 512gb ssd's in my desktop and 2x samsung 840 > 512gb msata's in my dell e7420 that knock on wood has been great, both > raid1 only. I've never not been able to recover data off a raid1 config > with linux when one fails. > > Happy to share my setup steps, latest to do this with mint, but sorta > works with ubuntu other than their installers being terrible about dealing > with me shifting the fs about under it. I gave up doing this with 14.04, > they crippled it entirely for this sort of setup. > > > Thanks, > > Mark > > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings:http://lists.phxlinux.org/mailman/listinfo/plug-discuss > > > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss >