An advanced file system that can span multiple disks, heal itself from data corruption, deduplicate data, encrypt, etc.

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27
votes
11answers
46k views

Is ZFS and RAID-Z worth using in home made NAS (freeNAS for example)

Features of ZFS and RAID-Z look vary promising. Looks like it is a perfect FS for home NAS solutions, poor man's Drobo things and alike. Are there any drawbacks I should be aware of?
16
votes
4answers
9k views

TAR vs CPIO, what is the difference?

I am curious and did a bit of reading but still have questions. What makes CPIO different than TAR? I was told in another question that tar is for pulling together many files into 1 archive which ...
15
votes
8answers
38k views

Access a ZFS volume in Windows?

You'd think this would have been asked but I can't seem to find it so... Let's say I have a ZFS setup in this enclosure (8 bay USB3 JBOD): http://www.sansdigital.com/towerraid-/tr8uplusb.html Now, ...
10
votes
2answers
2k views

Formula to calculate probability of unrecoverable read error during RAID rebuild

I want to compare the reliability of different RAID systems with either consumer (URE/bit = 1e-14) or enterprise (URE/bit = 1e-15) drives. The formula to have the probability of success of a rebuild ...
9
votes
3answers
1k views

How to make a redundant desktop system with daily snapshots? (Is btrfs ready for use?)

I want to configure a desktop system in which the home filesystem would be redundant (e.g. RAID-1), and would have weekly snapshots taken. I've already done this with ZFS, the snapshot system is ...
7
votes
4answers
1k views

How to build a NAS?

I have quite a bit of photos I'd like to organize and get away from sparse DVDs and move to a NAS solution. Ideally, this would let me have some level of redundancy and more easily find what I'm ...
6
votes
4answers
10k views

Start a ZFS RAIDZ zpool with two discs then add a third?

Let's say I have two 2TB HDDs and I want to start my first ZFS zpool. Is it possible to create a RAIDZ with just those two discs, giving me 2TB of usable storage (if I understand it right) and then ...
6
votes
3answers
2k views

Feedback on Using ZFS and FreeBSD

I need to create a server that will be used solely for backing up files. The server will have 2TB of RAID-5 storage to begin with but I may want to add additional storage later on. As such, I am ...
6
votes
1answer
11k views

NAS - ZFS system versus NTFS or EXT4 system

I was contemplating purchasing a QNAP 459-II for my home storage/streaming needs and a friend advised me that I should look into ZFS rather. I read up a bit on the filing system technology and was ...
6
votes
7answers
7k views

Setting up a home server - what to use? (ZFS vs btrfs, BSD vs Linux, misc other requirements)

I need to get all our home content off individual machines and onto a central server. What I'd like to have is the metaphorical "server under the stairs". Stuff we need: expandable storage. I ...
6
votes
1answer
2k views

A ZFS or LVM or MD redundant heterogeneous storage proposal

I have the same problem most people have: how to create a reliable personal storage solution with the fact that: Hard drives fail with alarming regularity. Losing files is unacceptable. I will buy ...
5
votes
2answers
2k views

How strong is ZFS encryption?

I've been playing with ZFS for quite a while, and was wondering how secure the disk encryption is for ZFS and how long it would hold up under a determined attack (I'm aware some of it has to do with ...
5
votes
4answers
9k views

ZFS Beginner Setup with Different Size Drives

Sorry for the noobie questions, I've been Googling all sorts of walkthroughs to create my ZFS raid, but I can't seem to find the correct links for the answers I'm looking for. This is my first ...
5
votes
2answers
1k views

ZFS moving drives around

At some point I'm going to build an OpenSolaris based NAS. I was wondering that if I make a 4 drive RaidZ1 pool and at some point need to move the pool to another OpenSolaris server do is there ...
5
votes
1answer
2k views

My ZFS dataset is gone after system upgrade/reboot (ubuntu)

I did recently upgrade my little NAS to ubuntu 14.04 and initially everything worked fine. I'm used to re-import my ZFS pools after restarts and so it was no surprise when the mount point was gone ...
4
votes
2answers
7k views

Automount ZFS zpool in Ubuntu 12.04

So, I've been told that ZFS for Linux has the ability to automatically mount a zpool on system startup in Ubuntu 12.04, but it doesn't work for me and I can't find any documentation on how to make it ...
4
votes
3answers
1k views

RAID5 / RAIDZ - is it possible to enlarge without losing data?

If I have a RAID5 with 4x1TB drives, and then in, say, a year I decide to upgrade to 4x2TB, can I swap out one drive at a time, then let the parity rebuild, even if it's mixed-size drives? Obviously ...
4
votes
1answer
6k views

FreeNAS: single-disk ZFS?

I have an older PC being re-purposed as a FreeNAS box for the household LAN. So far I've got FreeNAS installed to a USB thumb drive and a 500GB SATA drive for storage. I went and unmounted the hard ...
4
votes
1answer
1k views

How to use ZFS on linux easily (without paths like /var/run/zfs) or as non-root

When I asked about filesystems with compression I got recommendation to try ZFS. Looks like it worth trying, however I find tools that manage ZFS (zfs, zpool) quite overcomplexified - you need to ...
4
votes
2answers
360 views

What free space thresholds/limits are advisable for 640 GB and 2 TB hard disk drives with ZEVO ZFS on OS X?

Assuming that free space advice for ZEVO will not differ from advice for other modern implementations of ZFS … Question Please, what percentages or amounts of free space are advisable for hard disk ...
4
votes
3answers
2k views

Transferring existing files from ext3 to ZFS (on FreeBSD)

I use an old machine as a file server, for backups, and as a testbed for development. I currently have Debian installed, but I'm very interested in FreeBSD because of ZFS: I really, really like its ...
4
votes
1answer
8k views

ZFS Hard Drive Configuration in FreeNAS

I've been messing around with FreeNAS installed on a USB Flash Drive for a week or so, just testing all the services and possible hard drive configurations utilizing ZFS. It's a pretty neat setup but ...
4
votes
2answers
540 views

ZFS performance issue

i recently set up a FreeNAS server with the following specs: 2.2Ghz AMD Processor 5GB RAM (just put in what i had) 500GB system drive (with a data partition, probably UFS?) 2x1TB data drives in a ...
3
votes
3answers
3k views

ZFS (on Linux)'s memory requirement for a non-fileserver computer

A lot of material on ZFS mentions that basically the more memory you can throw at it, the better. However, I plan to use ZFS on a notebook with 16GB of RAM -- while that should be enough for ZFS, I ...
3
votes
2answers
496 views

Where is the ZFS project for the Mac located as of 2010?

Where is the ZFS project for the Mac located as of 2010? The Mac Forge project appears to have closed down.
3
votes
1answer
4k views

How can I tell if ZFS (zfs-fuse) dedup/compression is applied to a particular file?

I have a zfs formatted partition using zfs-fuse for linux (Ubuntu). I had used it for a while, and then enabled dedup and compression on it (zfs set compression=on/dedup=on). Now I think I have some ...
3
votes
1answer
312 views

Can two seperate zpools exist on the same physical devices?

Short: Can I share a disk between two separate zpools? Long: I want a raidz2 array but I can't afford it all at once. My possible solution is to start with two drives. I would create a mirror using ...
3
votes
1answer
6k views

How to add a mirror-disk to my OpenSolaris?

I have a machine with two harddrives. I have installed OpenSolaris on one of them and now I want to add the other one as a mirror-drive in my zpool rpool. I guess I have to format the second disk ...
3
votes
1answer
112 views

Growing a ZFS pool from populated ext4 disks

I've got an Ubuntu media server with 4 ext4 2TB drives, 1 ext4 4TB drive, and 1 new blank 4TB drive. The ext4 volumes are configured as individual drives (not RAID, etc.). The 2TB drives are about ...
3
votes
1answer
655 views

using ZFS and local hard drives as a cache for a remote iSCSI SAN

This is purely theoretical idea, i dont plan on doing this any time soon, but could you use Local hard drives as a kind of Cache to remote drives stored on Amazon EC2, shared to a user via iSCSI? The ...
3
votes
1answer
2k views

hosting iscsi on smartos

I am trying to get back into the unix game for some storage projects we have got going. We would love to use joyents smartos (based on illumos) for that. Working with it is a real joy (setting up vms ...
3
votes
1answer
1k views

Can't figure out HD replacement in FreeNAS 8

So I'm testing this out in VirtualBox, and I've got two 10GB drives as a test (mirror of ada1 and ada2, ZFS). I create a zpool/volume called "tank" with the two drives, no problem. Then I power off, ...
3
votes
1answer
4k views

Setting up an email alert when ZFS disk fails on FreeNAS

I am trying out FreeNAS 0.7.2 Sabanda (revision 5226) with 4x1TB disks, single parity ZFS RAID. While the email reports built into FreeNAS are good, I was wondering if there was a way I could get it ...
3
votes
1answer
195 views

Unmounting a zfs pool while it is shared with sharenfs

I have a Solaris (open indiana) system which is getting poor disk write performance. In order to enable ZIL in this version of zfs I need to add a line to /etc/system. This will not take affect until ...
3
votes
1answer
63 views

Managing disk in a VM

I'm replacing my two old rack servers with a new one that has plenty of power to take over the functionality my current servers. The server is a 4U rack mount with 16 3.5" SAS drive bays, two 2.5" ...
2
votes
3answers
474 views

which ZFS-like filesystem can optimize volume selection based on file access patterns?

Is there a redundant RAID/ZFS-like filesystem that can optimize the placement of files based on their access patterns? My goal is to build a desktop system that will automatically move files among a ...
2
votes
2answers
178 views

Is RAID1 or similar needed for btrfs/ZFS to protect against bit rot?

I'm running a file server using Linux software raid, set up as raid6. As filesystem I've chosen btrfs. However, I'm not using btrfs own raid6 implementation as it's not very stable yet. So basically, ...
2
votes
1answer
610 views

ZFS compressed and deduped filesystem on file

I can create squashed filesystems with mksquashfs in this way: mksquashfs dir-1 dir-2 ... dir-n filesystem-on-file.squash -comp xz -Xbcj x86 -Xdict-size 1048576 -b 1024k mksquashfs provides ...
2
votes
1answer
1k views

ZFS (file system): what is an “uberblock” used for?

Why does ZFS (and possibly some other file systems out there) tend to use an "uberblock" on top of imaps? Why can't there just be multiple imaps instead of the uberblock?
2
votes
1answer
1k views

Best way to mount a remote ZFS share in Windows and make it appear local, or close to local

I primarily use Linux and Mac, where sharing folders and block devices is easy and just works. I have a 38TB ZFS-backed Ubuntu fileserver that pretty much stores all of my data for all of my devices. ...
2
votes
2answers
1k views

How to access freebsd zfs partition under Linux using zfs-fuse?

I have installed dual OSs on my PC box: Linux and FreeBSD. The FreeBSD is installed on a ZFS partion under /dev/sdb1. Under Linux, the fdisk -l /dev/sdb outputs Device Boot Start End ...
2
votes
2answers
594 views

ZFS NAS: PCI-e x1 SATA or built-in ICH10R?

I am planning to install Nexenta (or NexentaStor, I've not decided yet) to build a ZFS NAS out from the following machine: MB: Intel DG45FC Disks: 4x 2TB WD caviar green RAM: 2x 2GB of non-ECC ...
2
votes
1answer
935 views

Removing files on ZFS does not free disc-space

I'm trying to free space on a ZFS by removing files. They are large (>1GB) so it should show in the numbers. Unfortunately, after unlinking the files, df does not show any increase in available ...
2
votes
1answer
587 views

Why is ZFS gzip-9 compression so much worse than actually using zip files?

I am working with some very large packet capture files (~150GB across 30 files) but because of how highly redundant packet captures are, these compress to ~7% (14.29x) of their originally file size ...
2
votes
1answer
534 views

Will custom kernel module persist through kernel upgrades?

I was wondering if custom kernel modules that I compile and install via a package will persist through a kernel upgrade. I am trying to install ZFS as kernel module in Ubuntu but the problem is ...
2
votes
1answer
662 views

ZFS distribution in Linux kernel? [closed]

If anyone has a better title for this question feel free to edit I am wondering about something related to the conflict between CDDL (Sun's license) and the GPL. Mainly pertaining to the reason ZFS ...
2
votes
1answer
275 views

ZFS Scrub isn't making any progress

I started a zfs scrub operation over 10 hours ago, and it doesn't seem to be making any progress: # zpool status pool: foo state: ONLINE scan: scrub in progress since Sat Nov 26 00:11:38 2011 ...
2
votes
2answers
679 views

ZFS RAIDZ Parity

I am building an OpenSolaris box to attempt to use ZFS and RAIDZ. I am starting simple with the OS on one drive and wanting to store all my data on the RAIDZ volume. I am a bit confused on RAIDZ is ...
2
votes
1answer
1k views

Home ZFS based NAS…What processor/chipset to use? [closed]

So, I'm building a home/personal NAS. My plan is to expose both SMB fileshares for sharing files/media between hosts, but also to carve an iSCSI target LUN out of it for use by VMWare as a datastore. ...
2
votes
1answer
1k views

4k hard drives freebsd gpart and zfs

I have 3 hdd, with the next camcotrol identify. root@cirmos:/root # camcontrol identify ada1 pass2: <WDC WD10EZEX-00RKKA0 80.00A80> ATA-8 SATA 3.x device pass2: 300.000MB/s transfers (SATA 2.x, ...