Move rsnapshot to other server

I have to move the whole rsnapshot pool to another server.
Any hint on how to do this? I think that running plain rsync between
servers would break all hard-links.

Any suggestions?

Additionally, which is the best FS for the new server? I'm thinking to
use XFS. What do you think ?

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[quote]On Jul 7, 2016, at 00:16, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:

Additionally, which is the best FS for the new server? I'm thinking to
use XFS. What do you think ?

[/quote]How many spindles? How much data? Single node or dfs?

ZFS, regardless.

rhel crew is pushing xfs pretty hard, but they're also pushing systemctl, so......

Or butter. It's pretty good too.

Or just drink lots of whisky.
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2016-07-07 12:37 GMT+02:00 Ken Woods <kenwoods < at > gmail.com>:
[quote]How many spindles? How much data? Single node or dfs?
[/quote]
6 SATA disks (7200) in RAID-6 (probably software)

[quote]ZFS, regardless.

rhel crew is pushing xfs pretty hard, but they're also pushing systemctl, so......

Or butter. It's pretty good too.

Or just drink lots of whisky.
[/quote]
So, are you suggesting ZFS over XFS ?

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2016-07-07 12:46 GMT+02:00 Gandalf Corvotempesta
<gandalf.corvotempesta < at > gmail.com>:
[quote]So, are you suggesting ZFS over XFS ?
[/quote]
anyway, my biggest concern is how to move data between these two host.
I don't think that a plan "rsync" would be ok.

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You can use rsync with the H option and that will preserve hard links.

Ken Woods <kenwoods < at > gmail.com> wrote:

[quote]
[quote]On Jul 7, 2016, at 00:16, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:

Additionally, which is the best FS for the new server? I'm thinking to
use XFS. What do you think ?

[/quote]How many spindles? How much data? Single node or dfs?

ZFS, regardless.

rhel crew is pushing xfs pretty hard, but they're also pushing systemctl, so......

Or butter. It's pretty good too.

Or just drink lots of whisky.
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rsync -H will preserve hard links

--
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This electrogram was despatched by wireless field telegraph. I would therefore ask that the recipient be so kind as to excuse any failures of courtesy or linguistic inelegance as an unfortunate side-effect of the technology.

[quote]On 7 Jul 2016, at 09:16, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:

I have to move the whole rsnapshot pool to another server.
Any hint on how to do this? I think that running plain rsync between
servers would break all hard-links.

Any suggestions?

Additionally, which is the best FS for the new server? I'm thinking to
use XFS. What do you think ?

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[/quote]

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Hi Gandalf,

On 2016-Jul-07 12:46, Gandalf Corvotempesta wrote:
[quote]2016-07-07 12:46 GMT+02:00 Gandalf Corvotempesta
<gandalf.corvotempesta < at > gmail.com>:
[quote]So, are you suggesting ZFS over XFS ?
[/quote]
anyway, my biggest concern is how to move data between these two host.
I don't think that a plan "rsync" would be ok.
[/quote]
To preserve hard links, you need to use -H switch. I used this command
to copy rsnapshot backup directory from another server:

rsync -avz -H --numeric-ids --progress root < at > server-ip:/mnt/backup/ /mnt/backup/

I use xfs on software RAID10 and it works just fine. I think your
biggest worry regarding performances should be that RAID6, not the file
system.

HTH

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On Thu, Jul 7, 2016 at 7:09 AM, David Cantrell <david < at > cantrell.org.uk> wrote:
[quote]rsync -H will preserve hard links

--
David Cantrell
[/quote]
For the initial replication "rsync -aH" is your friend much as it is
for rsnapshot itself. You can actually make a tuned rsnapshot config
to do nothing but make,a single snapshot copy of another rsnapshot
repository.

There are other technologies available for the first replication. Aa
bit of pruning and only grabbing the last snapshots, and using "cp -a"
for systems that can see the filesystem of the other systrem over NFS
can be your friend, as can "tar" or even "star" to copy SELinux
attributes.

It's also important to be aware that rsync does *not* normally
checksum files with matching names, timestamps, and sizes. I've
actually been bitten this way....

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[quote]On Jul 7, 2016, at 02:46, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:
2016-07-07 12:37 GMT+02:00 Ken Woods <kenwoods < at > gmail.com>:
[quote]How many spindles? How much data? Single node or dfs?
[/quote]6 SATA disks (7200) in RAID-6 (probably software)
[/quote]
Why not do it for real? Software raid isn't really reliable.

[quote][quote]ZFS, regardless.
rhel crew is pushing xfs pretty hard, but they're also pushing systemctl, so......Or butter. It's pretty good too. Or just drink lots of whisky.
[/quote]So, are you suggesting ZFS over XFS ?
[/quote]
Unequivocally. Also look at btrfs, but it's less mature. Or just drinking more, which is what I do.

We're up to 19pb with our latest hardware refresh. Also why I drink.
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Il 07 lug 2016 17:24, "Ken Woods" <kenwoods < at > gmail.com ([email]kenwoods < at > gmail.com[/email])> ha scritto:
[quote]Why not do it for real?  Software raid isn&#39;t really reliable.
[/quote]I had much more troubles with hardware raid than software like disks kicked out with no reasons and data loss (imagine 5 disk kicked out simultaneously on a 6 disks raid6)
I have much more confidence with kernel developers than a proprietary buggy firmware found on hardware controller.
on a dual CPU server with 16gb ram, software raid should not be that bad. even better than a dump xor controller with a single core.

You missed my humor.
Sorry. I was making a joke.

Use zfs and run raidz2. Feed ZFS the hardware directly: don't put something else in between ZFS and the hardware.

On Jul 7, 2016, at 09:06, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com ([email]gandalf.corvotempesta < at > gmail.com[/email])> wrote:

[quote]
Il 07 lug 2016 17:24, "Ken Woods" <kenwoods < at > gmail.com ([email]kenwoods < at > gmail.com[/email])> ha scritto:
[quote]Why not do it for real? Software raid isn't really reliable.
[/quote]I had much more troubles with hardware raid than software like disks kicked out with no reasons and data loss (imagine 5 disk kicked out simultaneously on a 6 disks raid6)
I have much more confidence with kernel developers than a proprietary buggy firmware found on hardware controller.
on a dual CPU server with 16gb ram, software raid should not be that bad. even better than a dump xor controller with a single core.

[/quote]

On Thu, Jul 07, 2016 at 07:22:21AM -0800, Ken Woods wrote:
[quote][quote]On Jul 7, 2016, at 02:46, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:
2016-07-07 12:37 GMT+02:00 Ken Woods <kenwoods < at > gmail.com>:
[quote]How many spindles? How much data? Single node or dfs?
[/quote]6 SATA disks (7200) in RAID-6 (probably software)
[/quote]Why not do it for real? Software raid isn't really reliable.
[/quote]
[citation needed]

[quote][quote]So, are you suggesting ZFS over XFS ?
[/quote]Unequivocally.
[/quote]
ZFS recommends *not* using hardware RAID.

I'd recommend always using software RAID, partly because raidz *is*
reliable, and partly because hardware RAID will fuck you over if the
hardware dies and you don't have a replacement available that
understands how it has laid data out on the physical disks.

--
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If you can't imagine how I do something, it's
because I have a better imagination than you

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My god you people are fucking humorless.

[quote]On Jul 8, 2016, at 06:18, David Cantrell <david < at > cantrell.org.uk> wrote:

On Thu, Jul 07, 2016 at 07:22:21AM -0800, Ken Woods wrote:
[quote][quote]On Jul 7, 2016, at 02:46, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:
2016-07-07 12:37 GMT+02:00 Ken Woods <kenwoods < at > gmail.com>:
[quote]How many spindles? How much data? Single node or dfs?
[/quote]6 SATA disks (7200) in RAID-6 (probably software)
[/quote]Why not do it for real? Software raid isn't really reliable.
[/quote]
[citation needed]

[quote][quote]So, are you suggesting ZFS over XFS ?
[/quote]Unequivocally.
[/quote]
ZFS recommends *not* using hardware RAID.

I'd recommend always using software RAID, partly because raidz *is*
reliable, and partly because hardware RAID will fuck you over if the
hardware dies and you don't have a replacement available that
understands how it has laid data out on the physical disks.

--
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If you can't imagine how I do something, it's
because I have a better imagination than you

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[/quote]
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[quote]On Jul 8, 2016, at 06:18, David Cantrell <david < at > cantrell.org.uk> wrote:

On Thu, Jul 07, 2016 at 07:22:21AM -0800, Ken Woods wrote:
[quote][quote][quote]On Jul 7, 2016, at 02:46, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:
[/quote][/quote][/quote]
[quote][quote]So, are you suggesting ZFS over XFS ?
[/quote]Unequivocally.
[/quote][/quote]^^^^^^^^^^^^^^^^
How the fuck can you read this, and not realize I was making fun of the people who say this:

[quote][quote]"Software raid isn't really reliable."
[/quote][/quote]
[quote]ZFS recommends *not* using hardware RAID.

[/quote]Yes. Which is what I meant when I said:

[quote]Feed ZFS the hardware directly: don't put something else in between ZFS and the hardware.
[/quote]

This is the problem with most "storage" people: they get so wrapped up in their egos and proving everybody else wrong they miss the humor.
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-H takes an enormous amount of memory overhead and it's overkill for
this application.
You don't need to know the linkages between non-successive snapshots.
Why not replicate rsnapshot's behavior?
The following was written for juggling snapshots on raids connected to
the same server, but it could be adapted
for a remote target:

#!/bin/bash
if [ -z "$1" ]; then
echo "Copies one rsnapshot host backup set from one disk to
another"
echo "Syntax: $0 srcpath hostname destpath"
echo "Example: $0 /mnt/das1/snapshots webserver
/mnt/das3/snapshots"
exit 1
fi
if ! [ -d $1 -a -d ${1}/daily.0/$2 -a -d $3 ]; then
echo "Invalid path(s)"
exit 1
fi
date
echo "======================= daily.0 ======================="
/usr/local/bin/rsync -aS --info=progress2 --delete --numeric-ids
${1}/daily.0/${2}/ ${3}/daily.0/${2}/
last="daily.0"
for i in daily.{1,2,3,4,5,6} weekly.{0,1,2,3}
monthly.{0,1,2,3,4,5,6,7,8,9,10,11,12} ; do
if [ -d ${1}/${i}/$2 ]; then
echo "======================= $i ======================="
mkdir -p ${3}/$i
/usr/local/bin/rsync -aS --info=progress2 --delete
--numeric-ids --link-dest=${3}/${last}/${2}/ ${1}/${i}/${2}/ ${3}/${i}/${2}/
last=$i
fi
done
echo "======================= DONE ======================="
date
exit

On 7/7/16 6:09 AM, David Cantrell wrote:
[quote]rsync -H will preserve hard links

[/quote]
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On Fri, Jul 8, 2016 at 10:38 AM, Ken Woods <kenwoods < at > gmail.com> wrote:
[quote]

[quote]On Jul 8, 2016, at 06:18, David Cantrell <david < at > cantrell.org.uk> wrote:

On Thu, Jul 07, 2016 at 07:22:21AM -0800, Ken Woods wrote:
[quote][quote][quote]On Jul 7, 2016, at 02:46, Gandalf Corvotempesta <gandalf.corvotempesta < at > gmail.com> wrote:
[/quote][/quote][/quote]
[quote][quote]So, are you suggesting ZFS over XFS ?
[/quote]Unequivocally.
[/quote][/quote]^^^^^^^^^^^^^^^^
How the fuck can you read this, and not realize I was making fun of the people who say this:
[/quote]
Down, boy. Deep breath. Have you been talking to Lennart Pottering or something?

[quote][quote][quote]"Software raid isn't really reliable."
[/quote][/quote]
[quote]ZFS recommends *not* using hardware RAID.

[/quote]Yes. Which is what I meant when I said:
[/quote]
Not everyone tracks these issues with such detail. Some people work
mostly in useland.

[quote][quote]Feed ZFS the hardware directly: don't put something else in between ZFS and the hardware.
[/quote]

This is the problem with most "storage" people: they get so wrapped up in their egos and proving everybody else wrong they miss the humor.
[/quote]
My friend, if you're trying for irony about your own comments, it's
obscure. Stick with the rubber chicken jokes for a few days.

More seriously, after more than 25 years in the biz, I've never laid
hands on ZFS and know of it only as overpriced hype that burns
hardware and administrative resources better spent on a real backup
system like:

(small musical fanfaire)

A much less expensive server running rsnapshot, maybe with an archival
USB drive rotation attached to it.

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On Sat, Jul 09, 2016 at 07:40:33AM -0400, Nico Kadel-Garcia wrote:

[quote]More seriously, after more than 25 years in the biz, I've never laid
hands on ZFS and know of it only as overpriced hype that burns
hardware and administrative resources better spent on a real backup
system like:

(small musical fanfaire)

A much less expensive server running rsnapshot, maybe with an archival
USB drive rotation attached to it.
[/quote]
That works well when you don't have much data to back up. Once you're
backing up multiple TB, and your data is constantly expanding, then ZFS
becomes Really Handy.

--
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Computer Science is about lofty design goals and careful algorithmic
optimisation. Sysadminning is about cleaning up the resulting mess.

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But if you use zfs as your backup, and zfs as your regular file system,
it seems you would not need rsnapshot at all, there are scripts which
create snapshots in somewhat the same way as rsnapshot. However, I
don't like to have the backup system use the same technology, just to be
safer. Also, it seems to be easier to do restores from older versions
with rsnapshot than zfs.

David Cantrell <david < at > cantrell.org.uk> wrote:

[quote]On Sat, Jul 09, 2016 at 07:40:33AM -0400, Nico Kadel-Garcia wrote:

[quote]More seriously, after more than 25 years in the biz, I've never laid
hands on ZFS and know of it only as overpriced hype that burns
hardware and administrative resources better spent on a real backup
system like:

(small musical fanfaire)

A much less expensive server running rsnapshot, maybe with an archival
USB drive rotation attached to it.
[/quote]
That works well when you don't have much data to back up. Once you're
backing up multiple TB, and your data is constantly expanding, then ZFS
becomes Really Handy.

--
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Computer Science is about lofty design goals and careful algorithmic
optimisation. Sysadminning is about cleaning up the resulting mess.

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[/quote]
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