Should I use a CoW filesystem on my PC if I only wanted snapshot capabilities ? Post: 303044797

Sponsored Content

Top Forums UNIX for Beginners Questions & Answers Should I use a CoW filesystem on my PC if I only wanted snapshot capabilities ? Post 303044797 by stomp on Wednesday 4th of March 2020 05:42:58 AM

03-04-2020

Registered User

Another comment:

A con against zfs is the inability to remove VDEVs. A VDEV is a subpart of a volume.

Example:

Say you have a data volume consisting of a single disk(=vdev, 1 TB). You decide to replace your vdev of a single disk with a raid-1 vdev(1 TB), since you want add redundancy to be safe in case of a disk crash. That's possible. Over the years, you add another 2 vdevs(2x2TB,2x4TB) with raid-1 arrays. So you then have 3 vdevs making up your volume consisting of 2 disks each with an overall capacity of 7 TB.

You now decide you want to increase your storage again and simultaneously reorganize your 3 x raid1(6 disks=>7 TB usable) to 1 x raidz2(5x6 TB =>18 TB usable) to be able to cope with more simulateous disk crashes(2 disk crashes without data loss here) and at the same time reduce the number of active disks(6->5).

With zfs this is only possible by reformatting, since device removal is not fully supported by now. So you have to copy all the data, which must be done offline. ZFS top level device removal is in development at the moment, but i expect some years to pass until even raidz vdevs can be removed.

With LVM you can just add the new underlying disks and remove the old disks. No problem. All is possible to be done online. Btrfs can do that to and is even flexible to do more advanced migrations.

And Here are some experience reports about btrfs and zfs from users:

ZFS Vs BTRFS : linux

Some not to long gone data loss stories about btrfs are also there. I assume the cause may be lacking knowledge about file system operation. But of course that's only a suspicion.

Last edited by stomp; 03-04-2020 at 06:52 AM..

stomp

View Public Profile for stomp

Find all posts by stomp

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Unix Capabilities?

We are looking into buying a new software, billing software that is, and want to know if you can run that on the same UNIX server as another major software? Is there a limit to the different types of software Unix can run, or is it like windows where you can install as many as you like? ...

2. UNIX for Advanced & Expert Users

p570 Capabilities

Hi there. I've been tasked with making a new design for our Unix systems :eek: Now the question I have is; How many LPARs can a p570 hold WITHOUT using a VIO Server. Many Thanks Kees

3. Red Hat

Adding capabilities to an RPM

Hi. I downloaded a package that could only be installed on RHEL5, and not 4 or 3, so I got the source in order to compile it on RHEL 3 so hopefully it will work on all versions. So I have the source for a working package, but when I build it in RHEL 3 and then try to install it in RHEL 5, it...

4. Filesystems, Disks and Memory

Wanted: Geographically distributed filesystem solution

I'm looking for a means to ensure that servers in the two or three datacenters, connected in a ring via IP through two ISPs, can distribute load and/or replicate data among at least two SAN-class disk devices. I want to evaluate several solutions, and I'm open to solutions ranging from free,...

5. Solaris

Cannot use filesystem while sending a snapshot

I've got a Solaris 11 Express installed on my machine. I have created a raidz2 zpool named shares and a simple one-disc zpool named backup. I have made a script that would send a daily snapshot of shares to backup. I use these commands zfs snapshot shares@DDMMRRRRHHMM zfs send -i shares@.......

6. UNIX for Advanced & Expert Users

Use of Capabilities

I wonder if anyone could assist with some problems I'm having with Linux Capabilities and their use when using the commands "nice" and "schedtool". I run a couple of PCs, one is an elderly AMD Sempron 2800+ (32-bit, 2GHz clock and 3GB memory) that is used as a family multimedia system running...

7. Linux

Broadcom under Fedora 18 (Spherical Cow)

So I'm having a problem getting a Broadcom BCM4312 wireless controller to work under the broadcom-wl module $uname Linux 3.8.11-200.fc18.x86_64 #1 SMP Wed May 1 19:44:27 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux lspci -v 05:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g...

8. UNIX for Advanced & Expert Users

Linux capabilities discussion

Hi I'm trying to compile my linux kernel with CONFIG_SECURITY_CAPABILITIES=y. any idea what this thing does ?? Also another question , If I compile the kernel that I'm currently using , what'll happen ? ~cheers

9. What is on Your Mind?

Anybody want to talk about Dirty Cow?

Hi All, How worried is everyone about the Dirty Cow Linux exploit? Has anybody experienced attacks yet? From the research I've done it seems that the exploit is "reliable" (that is it works nearly every time on vulverable systems) which is not good news. We all believe that Unix/Linux...

LEARN ABOUT DEBIAN

netapp::snapshot

NetApp::Snapshot(3pm)					User Contributed Perl Documentation				     NetApp::Snapshot(3pm)

NAME

       NetApp::Snapshot -- OO class for creating and managing snapshots

SYNOPSIS

	   use NetApp::Filer;
	   use NetApp::Snapshot;

	   my $filer   = NetApp::Filer->new( .... );

DESCRIPTION

       This class encapsulates a single NetApp snapshot, and provides methods for querying information about the snapshot, as well as methods for
       managing it.

METHODS

   get_parent
       Returns the NetApp::Aggregate or NetApp::Volume object for the aggregate or volume for which object is a snapshot.

   get_name
       Returns a string representing the name of the snapshot.

   get_date
       Returns the date the snapshot was created.

   get_used
       Returns the percentage of space used by snapshot.

   get_total
       Returns the percentage of total space used by the snapshot.

   get_snapshot_deltas
       Returns an array of NetApp::Snapshot:Delta objects, each representing a single delta for this snapshot.

   get_reclaimable
       Returns the amount of reclaimable space, if the snapshot is deleted.  Note that experimentally, this command has a lot of failure
       scenarios, most of which are reasonable (there are a lot of cases where you can't query this data).  Therefore, unlike most of the methods
       in this API, it doesn't raise a fatal exception if it can't query the information, it simply generates warnings.

   rename( $newname )
       Renames the snapshot to the specified name.

   restore( %args )
       This method is an interface to the "snap restore" command.  The argument syntax is:

	   $snapshot->restore(
	       type	       => 'vol' | 'file', # Defaults to vol
	       from_path       => $from_path,
	       to_path	       => $to_path,
	   );

       The 'type' argument maps to the -t CLI argument, and the 'to_path' argument maps to the -r CLI argument.  Refer to the na_snap(1) man page,
       and the "snap restore" documentation for further information.

perl v5.14.2							    2008-11-26						     NetApp::Snapshot(3pm)