Re: [BackupPC-users] Conf{PoolNightlyDigestCheckPercent} on btrfs and zfs

2021-05-08 Thread Alexander Kobel
Hi Guillermo, I agree. BackupPC's RefCnt/Fsck is a must IMHO. A main difference between PoolNightlyDigestCheck and btrfs' builtin checksumming is that the nightly digest checks proactively scan the data and will tell you about broken files as soon as they break (well, as soon as the next check

Re: [BackupPC-users] Conf{PoolNightlyDigestCheckPercent} on btrfs and zfs

2021-05-04 Thread Guillermo Rozas
> > One ensures against file system bit rot, the other ensures backup file > consistency. > I would say $Conf{PoolNightlyDigestCheckPercent} = 1 is also a check for bit rot, as the only thing it does is to read the file, re-calculate the md5 checksum, and compares it with its name (which is the md

Re: [BackupPC-users] Conf{PoolNightlyDigestCheckPercent} on btrfs and zfs

2021-05-04 Thread Michael Huntley
On 2021-05-04 00:45, Ghislain Adnet wrote: No, because that's like turning off the airbags on your car because you already have seatbelts. thanks for your answer, i am trying to understand more about this. If this check is to prevent bitrot or disk corruption of an existing file, and if rsy

Re: [BackupPC-users] Conf{PoolNightlyDigestCheckPercent} on btrfs and zfs

2021-05-04 Thread Ghislain Adnet
No, because that's like turning off the airbags on your car because you already have seatbelts. thanks for your answer, i am trying to understand more about this. If this check is to prevent bitrot or disk corruption of an existing file, and if rsync is sure the file is ok, and then that Z

Re: [BackupPC-users] Conf{PoolNightlyDigestCheckPercent} on btrfs and zfs

2021-05-02 Thread Michael Stowe
On 2021-04-30 00:09, Ghislain Adnet wrote: hi, Should this setting put to 0 on ZFS or BTRFS as the filesystem allready do checksumming and will detect issues ? No, because that's like turning off the airbags on your car because you already have seatbelts.

[BackupPC-users] Conf{PoolNightlyDigestCheckPercent} on btrfs and zfs

2021-04-30 Thread Ghislain Adnet
hi, Should this setting put to 0 on ZFS or BTRFS as the filesystem allready do checksumming and will detect issues ? Or is it something différent ? $Conf{PoolNightlyDigestCheckPercent} = 1; Integrity check the pool files by confirming the md5 digest of the contents matches their file