In data venerdì 19 luglio 2019 11:40:42 CEST, jdd@dodin.org ha scritto:
Le 19/07/2019 à 11:16, stakanov a écrit :
Uh, RAID and btrfs .... I have some experience with xfs, with ext4 but the ones I have with btrfs are, if not to say negative, a bit "mitigated".
the only problem I had was about partition size with snapshots
I would in all cases prefer ext4. Now the fact of the backup, I have 750 GB free on the /home
so more than 3Tb of data. simply rsync them to the 4Tb disk and disconnect it from the computer. If ever you need frequent sync, use a smaller disk with the time option. I personally have 3 >4Tb disks with one connected semi permanently (usb, switched off most of the time) and the two others rsynced from the first at various moments.
the *only* interest of RAID is the time frame: the computer don't really stops when a disk is bad.
BUT you have to get a spare disk to replace the faulty one ASAP, you are not protected from a AC surge that can destroy the two disks at once (as can do fire, thief or simply error
I stopped with RAID when I noticed a RAID 1 (mirror) disk can't be read simply alone (on an other computer), it have to be seen as RAID. Possible, but not immediate.
of course yo do what you want
jdd Well with mdadm you should not be in the problem not to be able on another computer. That problem you have it instead when you use RAID from BIOS (softraidfunktion in mainboard. What happens is that the RAID will then depend from that very chipset. mdadm should survive a change of MB flawlessly.
For what is security: I had only one time a real bad experience, when a RAID 1 had a bad Disc that reappeared and vanished at times. This caused the /home to be written to some extend to one disk, then to the other. It can be avoided though by doing a regular scrub of the RAID so you will immediately discover imminent disk failure due to a hardware problem. Sure, an external 4 TB disk as regular backup would be nice and better. But, be honest, it would have to be 8TB or more, to be able to do at least some incremental backups. Otherwise you will have to loose a lot of time to rsync it regularly (and with rsync you can do a lot of things wrong). b) the "he is dead" argument: I simply do not have the money for that external disk. _________________________________________________________________ ________________________________________________________ Ihre E-Mail-Postfächer sicher & zentral an einem Ort. Jetzt wechseln und alte E-Mail-Adresse mitnehmen! https://www.eclipso.de -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org