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#btrfs

8 posts8 participants1 post today
Continued thread

point of order this is on dedicated battery backup and can run uninterrupted with all accoutrement for about 2 hours, i think it's only lost power once. that rack has lost it entirely only twice. the first time was how i found out that apparently Cyberpower has had some SKUs that over the years betray you in the '10s. the networking and hypervisor were on the bottom rack UPS-backed power. networked UPS status is possible, too.

#Synology#NAS#btrfs
Btrfs - Most curious case, is this flaw or not. Can't really tell. - I've got lots of scattered data in dirty write buffers to disk, due to scattered writes and high system memory. I've also got long commit interval to allow efficient flushing (as contiguous as possible) when that scattered data is finally written to disk. It all works fine, if I sync before shutdown. But if I just shutdown the system, the flush process takes longer than the maximum allowed file system unmount time is. Even worse, some of the data is written to SSD and some to HDD. The state data is on SSD and actual data is on HDD. When the flush timeout is encountered, the system shuts down in state where state file says that this data is written to disk, and the data actually isn't on disk yet. - Flaw or not? - Of course this requires this curious combination of things to trigger, but the problem is very real. - Who's fault it is? #btrfs #data #corruption #loss #cow #linux #filesystem #shutdown

Still messing around with my system with broken #openzfs FS. To be honest, #btrfs has never been so problematic to me in the past. But I have to admit that I never used raid5 there (known to be broken), while I do use raidz on #zfs.

I have a machine running #btrfs RAID1 with two SATA SSDs.

If I were to replace one of them with an NVMe SSD, would that improve performance, or would it be bottlenecked by the remaining SATA SSD?

(I know mdraid has a write-mostly mode, but I don't want to use it because (1) no bitrot correction and (2) I'd rather live with a performance hit than take my chances with a fragile tower of storage layers.)

My experience with #FlashDrives recently has been mixed. I have no problem in encrypting them with #LUKS, using #cryptsetup or with formatting a partition with #Btrfs, for instance, using #gparted and doing other tinkering with #Gnome #disks. But the problem has been with the actual drives themselves. The cheaper ones seem to have quite a few bad sectors, etc. and so they’re not really reliable for medium term storage.

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