Am 11.08.20 um 21:33 schrieb Roman Mamedov: > On Tue, 11 Aug 2020 20:57:15 +0200 > Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote: > >>> Whichever filesystem you choose, you will end up with a huge single point of >>> failure, and any trouble with that FS or the underlying array put all your >>> data instantly at risk. >> >> calling an array where you can lose *two* disks as >> single-point-of-failure is absurd > > As noted before, not just *disks* can fail, plenty of other things to fail in > a storage server, and they can easily take down, say, a half of all disks, or > random portions of them in increments of four. Even if temporarily -- that > surely will be "unexpected" to that single precious 20TB filesystem. a sun storm can wipe everything > How will > it behave, who knows. Do you know? For added fun, reconnect the drives back 30 > seconds later. Oh, let's write to linux-raid for how to bring back a half of > RAID6 from the Spare (S) status. Or find some HOWTO suggesting a random > --create without --assume-clean. And if the FS goes corrupt, now you suddenly > need *all* your backups, not just 1 drive worth of them. i have not lost any bit on a raid in my whole lifetime but faced a ton of drives dying >> no raid can replace backups anyways > > All too often I've seen RAID being used as an implicit excuse to be lenient > about backups. Heck, I know from personal experience how enticing that can be. > >>> Most likely you do not. And the RAID's main purpose in that case is to just >>> have a unified storage pool, for the convenience of not having to manage free >>> space across so many drives. But given the above, I would suggest leaving the >>> drives with their individual FSes, and just running MergerFS on top: >>> https://www.teknophiles.com/2018/02/19/disk-pooling-in-linux-with-mergerfs/ >> >> you just move the complexity to something not used by many people for >> what exactly to gain? the rives are still in the same machine > > To gain total independence of drives from each other, you can pull any drive > out of the machine, plug it in somewhere else, and it will have a proper > filesystem and readable files on it. Writable, even. i have not lost any bit on a raid in my whole lifetime but faced a ton of drives dying
