ZFS is a modern filesystem originally developed by Sun Microsystems and licensed under the CDDL. An open-source fork of ZFS can be found at http://open-zfs.org/ , which is supported by ZFSonlinux.org, illumos.org and ZFS developers in the FreeBSD & MacOSX communities.

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224 views

GlusterFs + zfs xattr

i'm trying to setup a small fileserver using GlusterFs over Zfs over two boxes that are currently running ubuntu 13.04. i'm currently using glusterfs and zfs-fuse from ubuntu repositories and with ...
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1answer
2k views

scsi and ata entries for same hard drive under /dev/disk/by-id

I am trying to set up a ZFS pool using 4 bare drives which I have attached to my Ubuntu system via a SATA hot swap backplane. These are Hitachi SATA drives. When I list the contents of ...
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1answer
310 views

How to fetch current l2arc_max_write setting on Illumos?

I am trying to tweak my ZFS pool, but in order to do this I would like to know the current l2arc_max_write setting. I know the default is 8 MB/s, but I can't find the actual value. I have tried to ...
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1answer
2k views

How large is my ZFS dedupe table at the moment?

I have read a lot of information about planning RAM requirements forZFS deduplication. I've just upgraded my file server's RAM to support some very limited dedupe on ZFS zvols which I cannot use ...
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2answers
120 views

Looking for a high IO s3 “compatible” storage solution

Help me serverfault! I am looking for a high IO (2 million mostly put transactions per day of 7-10k xml chunks) storage solution that is amazon s3 compatible that I can house in my datacenter. I am ...
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1answer
328 views

ZFS, NFS and user based quotas

I am using a ZFS storage (FreeNAS 9.1) with NFSv3. The NFS is mounted on Debian machine, where the linux users are created (they don`t exists on FreeNAS). How do I enable standard linux user based ...
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4answers
1k views

What are the performance implications of running VMs on a ZFS host?

I'm considering migrating from ext3 to ZFS for data storage on my Debian Linux host, using ZFS on Linux. One killer feature of ZFS that I really want is its data integrity guarantees. The ability to ...
10
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1answer
3k views

Is calculating IOPS for ZFS RAIDZ different then calculating IOPS for RAID5 & RAID6?

When calculating IOPS for traditional RAID arrays, one could use the following formula (Borrowed from Getting The Hang Of IOPS v1.3 on Symantec Connect): Ieffective = (n * Isingle) / (READ% + (F * ...
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1answer
887 views

FreeNAS/FreeBSD: How to access status of ZFS volume from jail?

I am trying to set up NRPE to enable remote Nagios monitoring of a new FreeNAS 0.91 system. I mostly have this working. I can connect and inquire about basic information like number of processes, ...
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0answers
227 views

ZFS on >2TB disk in Ubuntu 12.04? [closed]

I just got a 4TB disk and I'm running Ubuntu 12.04. http://www.thegeekstuff.com/2012/08/2tb-gtp-parted/ says you need to partition your disk with GPT if you want to use >2TB (and that you can do this ...
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2answers
681 views

ZFS Reporting (on FreeBSD and Linux via ZoL)

As a longtime mdadm user is was just experiencing a disk error and remembered that I configured a Auto Mail reporting for mdadm on disk errors. Therefore i just had to insert my Mail address inside ...
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0answers
289 views

ZFS: Why does resilvering go over all disks in a pool rather than only those in the raidz1 vdev?

I'm wondering why Solaris is reporting action: Wait for the resilver to complete. scan: resilver in progress since Sun Jul 14 02:42:44 2013 24.9T scanned out of 39.2T at 54.9M/s, 75h46m to go ...
4
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1answer
341 views

Why am I getting slow and jumpy ZFS write performance?

I have a 10-disk RAIDZ in Solaris 11.1. Its connected by 8G fibre. I have created a ZVOL, made it available with COMSTAR and mounted it on another machine connected by fibre. When I benchmark it ...
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2answers
395 views

Multiple 2 TB LUNs — ZFS or ext4-over-LVM

I am going to deploy an Ubuntu 12.04-based archiving system. Due to limitations of the SAN Storage, it can only present me with 2TB LUNs. So, I have to merge multiple 2TB LUNs to achieve the desired ...
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1answer
1k views

ZFS endless resilvering

I have a large (> 100TB) ZFS (FUSE) pool on Debian that lost two drives. As the drives failed, I replaced them with spares until I could schedule an outage and physically replace the bad disks. When ...
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0answers
38 views

partitioning a 2x larger disk to house zfs migration

so there are numerous sites taking about using vdevs made from disk partitions like this in order to reorder vdevs of different sizes. however, i have the following physical disks: Disk /dev/sda: ...
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0answers
94 views

zfs with unsymmetric vdevs

let's assume that i have a raidz created from three disks (or vdevs). $ fallocate -l 64m /tmp/one $ fallocate -l 64m /tmp/two $ fallocate -l 64m /tmp/three $ sudo zpool create test raidz /tmp/one ...
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1answer
70 views

Recovering data from ZFS mirror

I have two disks from an old server that I believe were a mirrored set. I placed them in a new server and tried to do a zpool import but nothing was found. Does that mean the data that was on them ...
1
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1answer
369 views

Does a 3ware “ECC-ERROR” matter on a JBOD when I have ZFS?

I have a FreeBSD 8.x machine running ZFS and with a 3ware 9690SA controller. The 3ware controller shows an ECC-ERROR with one of the disks: //host> /c0 show VPort Status Unit Size ...
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1answer
181 views

What is the best private cloud storage setup

I need to create a private cloud and I'm searching for the best setup. These are my 2 most important requirements 1. Disk and system redundant 2. Price / GB as low as possible The system is going to ...
4
votes
1answer
420 views

ZFS ARC size vs target size

I am trying to understand the inner workings of the ZFS ARC. However, I am confused with several things: actual (zfs:0:arcstats:size) vs target size (zfs:0:arcstats:c). I understand that actual size ...
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2answers
182 views

Where ZFS configuration is saved?

I have a simple setup: Ubuntu 13.04 on internal USB thumbdrive 4xSATA drive in raidz spool with some volumes /tank/vol1, /tank/vol2 Where does zfs store its' configuration data - is it on ...
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2answers
554 views

What happens to missed writes after a zpool clear?

I am trying to understand ZFS' behaviour under a specific condition, but the documentation is not very explicit about this so I'm left guessing. Suppose we have a zpool with redundancy. Take the ...
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1answer
75 views

Can you add two non-mirrored disks to a zfs pool?

Is there a way to do something like this? zpool create newpool raidz /dev/disk1 /dev/disk2 ( /dev/disk3 + /dev/disk4 ) Assuming disk1 and disk2 are larger, and disk3 and 4 are smaller. You can get ...
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2answers
225 views

RAID 1E with ZFS

IBM's storage systems as well as Linux' mdraid do support RAID level 1E to be able to use an odd number of disks for a 50% redundancy: Would I achieve the same effect creating a zpool with an odd ...
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2answers
61 views

Mitigating risk of Disk Failure + Some corruption?

So my understanding of one scenario that ZFS addresses is where a RAID5 drive fails, and then during a rebuild it encountered some corrupt blocks of data and thus cannot restore that data. From ...
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2answers
181 views

Advice for inserting additional disks to a ZFS mirrored pool?

I am running FreeBSD 9.1 with root on a ZFS mirrored pool. At first the pool (labelled zroot) has a total of 1TB spanning two 1TB drives. Recently we have run into disk space issues in which the ...
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2answers
292 views

Details on ZFS scrubbing repairs requirements/guarantees

I found no details on how repairing works and what the requirements are from the docs. For automatic repairs from a scrub do I need to mirror? RAIDZ? Either? Neither (do the checksums themselves ...
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0answers
70 views

How do I get Ubuntu to forget about a destroyed zfs pool?

I have also asked this question over on Ask Ubuntu but I thought I'd try here as well. The details can be found at: ...
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2answers
629 views

Problems migrating ZFS pool from Openindiana build 151a7 to FreeBSD 9.1

I'm currently running Openindiana on ESXi with RDM access to the 2 disks in my ZFS pool. I used to run Ubuntu with ZFS on Linux but since ESXi 5.1 supports my hardware I wanted to move away from that ...
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0answers
68 views

Xen Debian VM and NFS

I have 2 servers in a pool running a single VM on each server. I just got xencenter running so I am managing through that. I want to have a shared storage (NFS) between the two of them, so that if one ...
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2answers
2k views

strange ZFS disk space usage report for a ZVOL

We have a 100G ZVOL on a FreeBSD 10.0-CURRENT host which claims to use 176G of disk space: root@storage01:~ # zfs get all zroot/DATA/vtest NAME PROPERTY VALUE ...
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2answers
575 views

Does speed of ZFS snapshot rollback depend on number of files?

I have tested a 10Gbit connection between two hosts to be able to read a 10GB file from host1 and write it to host2 using netcat, where the speed was 410MB/s. When I ZFS send/receive again with ...
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2answers
654 views

What does zfs receive -F do?

When I read man zfs for zfs receive I see -F Force a rollback of the file system to the most recent snap- shot before performing the receive operation. If receiving an ...
6
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2answers
2k views

ZFS performance: do I need to keep free space in a pool or a file system?

I know that the performance of ZFS heavily depends on the amount of free space: Keep pool space under 80% utilization to maintain pool performance. Currently, pool performance can degrade when a ...
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2answers
114 views

Nexenta - unknown trap type 8 in user mode

I'm trying to install NexentaStor 3.1.4.1 on Ubuntu 12.04 LTS KVM on AMD64 platform. During the install I encounter the following exception : "unknown trap type 8 in user mode" Can anyone point me ...
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1answer
146 views

Installing RHEL on a single disk with ZFS

I know ZFS is usually used for numerous reasons including it's amazing mirroring features. However in this instance the machine I've been tasked with setting up has a RAID-1 setup so I only have one ...
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1answer
101 views

ZFS root pool free space

I have an openindiana (oi_151a7) box where I used 30GB for the root partition during installation. This has become rpool1. I cannot figure out how to make the remaining 202 GB available. Looking for ...
1
vote
1answer
440 views

zfs send -i / receive stalling

On a Solaris 11.1 install, I see stalls when receiving a zfs incremental stream. The streams are originating from a Solaris 11.0 install, are created using zfs send -i and piped through mbuffer. At ...
3
votes
1answer
920 views

Can you set inode quotas in ZFS?

I figured out how to set block quotas in ZFS from the documentation on oracle's site. I didn't see if / how to setup a quota on how many inodes a user gets, though. I realize that there may not be ...
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vote
1answer
311 views

ZFS configuration opinions [closed]

Currently, I'm tasked with progressively building a ZFS store. IOPS are not the priority, data security and capacity are. In essence what we have is one brute of a machine, that contains an OS ...
1
vote
1answer
368 views

Safely migrate from 3ware 9650SE-8LPML to a 3ware SAS 9750-8i?

I have a server with a potenially faulty 3ware 9650SE-8LPML. I can log in to the server but the interface keeps reseting causing the whole system to lock down for minutes. My host suspects its the ...
4
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1answer
163 views

ZFS: will RAM shortage cause trouble?

what can happen if i've not enough RAM with a ZFS with dedup option activated?
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vote
1answer
527 views

How set ZFS ACL permissions on CentOS 6

I use last ZFS (ZFS for Linux) on the CentOS 6. Create successfully pool, all working fine. But i have one question. How i can set ACL for ZFS folder/file? GNU ls, chmod, and other coreutils not ...
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1answer
112 views

Can ZFS resilvering be used effectively for backing up to an external drive?

Suppose I currently use rsync to back up an internal drive periodically to an external drive. The external drive is usually stored offsite but is periodically brought over and plugged in via USB and ...
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2answers
135 views

How to delete and reuse ZFS filesystems inside a Pool

I have this ZFS Pool. NAME STATE READ WRITE CKSUM app ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c1t2d0 ONLINE 0 0 0 ...
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1answer
647 views

ZFS rpool full, cant do anything

I have a huge problem, my rpool is full, so when i boot, i have tons of "no space on device" in my shell. No way to log, ssh server is down. So i decided to boot with opensolaris Live cd and mount ...
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3answers
3k views

Tuning ZFS scrubbing, 141KB/s running for 15 days

A pretty basic system running mirror+stripe on 7.2k rpm sas disks, not particularly loaded. No dedup, compression on all datasets. Scrub has been running for 15 days at the speed of a dead snail. Is ...
2
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2answers
276 views

Is it possible to change filesystem properties for an existing ZFS pool?

Suppose I created a pool with compression=on, and later wanted to turn off compression in-place - is that possible and if so how? I'm using Zevo CE on OS X in case that makes any difference (zpool ...
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1answer
265 views

ZFS about 7.2% disk space is lost

I know that ZFS reserves 1.6% disk space for copy-on-write. However, I am losing more than that. I have a ubuntu server with native ubuntu-zfs installed. The server has 45 drives, each 3TB. I am ...