CentOS - Feb 2021 - Filesystem choice for BackupPC extrenal drive

I'm setting up a CentOS 7 box as a BackupPC 4 server to back up Windows 
boxes on my LAN. I'm using an external 1.5 TB USB drive for the
"pool".
BackupPC deduplicates by saving all files in a pool, a directory hiearchy 
with each file named for the checksum of the file, and the directories 
acting as a hash tree to reach each pool file. A backup for a specific 
workstation is a directory tree of checksums and metadata that point into 
the pool for the actual file data. Incremental backups are reverse deltas 
from periodic "filled" backups of all files. I'm using rsyncd to
pull
changed files from the workstations.

I'm deciding which filesystem to use for my external drive. I'm thinking
the main candidates are ext4 and xfs. What's the best filesystem for this 
application?

<https://github.com/backuppc/backuppc>

Repo for CentOS 7 users:

<https://copr.fedorainfracloud.org/coprs/hobbes1069/BackupPC/>

XFS is suitable for parallel workload, so I would pick ext4 for this case.
Here is a quote from?https://access.redhat.com/articles/3129891 :
Another way to characterize this is that the Ext4 file system variants tend to
perform better on systems that have limited I/O capability. Ext3 and Ext4
perform better on limited bandwidth (<?200MB/s) and up to ~1,000 IOPS
capability. For anything with higher capability, XFS tends to be faster.?


Best Regards,Strahil Nikolov

Sent from Yahoo Mail on Android 
 
  On Fri, Feb 5, 2021 at 2:42, Kenneth Porter<shiva at sewingwitch.com>
wrote:   I'm setting up a CentOS 7 box as a BackupPC 4 server to back up
Windows
boxes on my LAN. I'm using an external 1.5 TB USB drive for the
"pool".
BackupPC deduplicates by saving all files in a pool, a directory hiearchy 
with each file named for the checksum of the file, and the directories 
acting as a hash tree to reach each pool file. A backup for a specific 
workstation is a directory tree of checksums and metadata that point into 
the pool for the actual file data. Incremental backups are reverse deltas 
from periodic "filled" backups of all files. I'm using rsyncd to
pull
changed files from the workstations.

I'm deciding which filesystem to use for my external drive. I'm thinking
the main candidates are ext4 and xfs. What's the best filesystem for this 
application?

<https://github.com/backuppc/backuppc>

Repo for CentOS 7 users:

<https://copr.fedorainfracloud.org/coprs/hobbes1069/BackupPC/>


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Il 2021-02-05 01:41 Kenneth Porter ha scritto:
> I'm setting up a CentOS 7 box as a BackupPC 4 server to back up
> Windows boxes on my LAN. I'm using an external 1.5 TB USB drive for
> the "pool". BackupPC deduplicates by saving all files in a pool,
a
> directory hiearchy with each file named for the checksum of the file,
> and the directories acting as a hash tree to reach each pool file. A
> backup for a specific workstation is a directory tree of checksums and
> metadata that point into the pool for the actual file data.
> Incremental backups are reverse deltas from periodic "filled"
backups
> of all files. I'm using rsyncd to pull changed files from the
> workstations.
> 
> I'm deciding which filesystem to use for my external drive. I'm
> thinking the main candidates are ext4 and xfs. What's the best
> filesystem for this application?
While being a fan of XFS, for an external drive I would use EXT4. My 
(anectodal) experience is that EXT3/4 is more resilient to flacky 
hardware/connection as the one provided my many USB adapters.

Regards.

-- 
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