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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282 views

Unmounted ZFS filesystem

I inherited a FreeNAS setup with ZFS mounts. I ran through this crash course on ZFS (no previous experience), but it doesn't answer my question. I have this list when I run zfs list: [root@nas] ~# ...
3
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0answers
270 views

Using ZFS head node as database server?

I'm using a dual-head ZFS-backed NAS for high availability cluster shared storage, based on Nexenta's recommended architecture as seen here: The disks in 1 JBOD will store the database files for a ...
4
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3answers
1k views

Update from zfs-0.6.2-1.el6.x86_64 to zfs-0.6.3-1.el6.x86_64 has made by zpool unreadable

After running # yum update zfs and restarting my CentOS 6 ZFS on Linux system can no longer see or interact with it's zpools. # zpool status no pools available # zpool import zpool: ...
1
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0answers
75 views

Can I use ZFS to replicate (fast) EC2 instance store to (slow) EBS store?

I love the idea of using SSD EBS instance stores as L2ARC and ZIL for a zpool backed by EBS. Going further (and into more dangerous territory), could I instead create a zpool mirror with the 2 ...
1
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1answer
40 views

Does hot spare limit write speed in ZFS?

Let's say I have a ZFS pool with a fast SSD and I want to add a magnetic hot spare. Will the pool slow down to the hot spare's speed?
1
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2answers
728 views

ZFS RAID0 pool without redundancy

I created a ZFS pool on Ubuntu 14.04 without specifiying RAID or redundancy options, wrote some data to it, rebooted the machine and the pool is no longer available (UNAVAIL). I don't have the exact ...
2
votes
1answer
46 views

is zfs snapshot -r of several pools atomic?

Let's say I've got 2 zpools -- one with a database's database files and one with the database transaction logs. If I do a zfs snapshot -r database@snapshot will the resulting snapshots all be taken ...
3
votes
1answer
423 views

How to active HDD leds on HP MDS 600 / HP D6000?

I have a HP D6000 (sometimes called MDS 600) storage array, HP DL380p G8 with an LSI 9207-8e SAS adapter. When I am in the OmniOS (Solaris 10 fork), I can e.g. dd to one of the disks, but I don't see ...
1
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0answers
137 views

GlusterFS and ZFS snapshots

I know many people are using GlusterFS on top on ZFS. I'm wondering about snapshots: how do you ensure snapshot homogeneity among the nodes? I mean if you do a snapshot on a node, how can you be sure ...
2
votes
2answers
193 views

When to use hot-spare?

On my newly purchased HP MDS600 with 70x 4TB Nearline SAS disks, I now need to configure the disks, and I want raidz2, so the raid sizes follows 2^n+2. The options I therefore have are 7 raid sets ...
2
votes
2answers
2k views

How to remove the OpenSolaris ZFS dump device

The ZFS dump device is used only for debugging problems. In this case, I have decided the risk vs reward is such that I should delete the dump device to make room for other storage. I am able to ...
3
votes
2answers
169 views

Mimicking Google's Persistent Disks — Is this a logical FreeBSD disaster recovery strategy?

I am looking into FreeBSD to provide a more comprehensive backup and disaster recovery strategy for database servers. Ideally I want to mimic what google is doing with "Persistent disks" ...
1
vote
1answer
116 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 ...
2
votes
3answers
2k views

zfs rename/move root filesystem into child

Similar question exists but the solution (using mv) is awful because in this case it works as "copy, then remove" rather than pure "move". So, I created a pool: zpool create tank /dev/loop0 and ...
12
votes
1answer
977 views

Why did rebooting cause one side of my ZFS mirror to become UNAVAIL?

I just recently migrated a bulk data storage pool (ZFS On Linux 0.6.2, Debian Wheezy) from a single-device vdev configuration to a two-way mirror vdev configuration. The previous pool configuration ...
1
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1answer
164 views

ZFS booting troubles

I have FreeBSD 8.0, and rebooting arise while zfs scrub was runing. Now when system booting it frezee at moment with ZFS version and ZFS pool version. I can't even login. The question : Is the scrub ...
2
votes
1answer
894 views

Setup ZFS on freeBSD from bsd-rescue

I have a server from OVH and have the following procedure of setting ZFS on FreeBSD10 on OVH server following the https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror Creating a bootable ZFS ...
3
votes
2answers
4k views

FreeNAS confusion: not sure what happened. raidz1 “DEGRADED”, disk “FAULTED”

Sorry for the long narrative, but I'm thoroughly confused. I'm using FreeNAS-8.0.4-RELEASE-p2-x64 (11367) on a box with 5x3TB SATA disks configured as a raidz volume. A few days ago, the console ...
8
votes
1answer
716 views

Where is the overhead for ZFS RAIDZ2 on 4K sector disks going?

I started by creating 16 empty files of exactly 1 billion bytes: for i in {1..16}; do dd if=/dev/zero of=/mnt/temp/block$i bs=1000000 count=1000 &> /dev/null; done Then I created larger and ...
1
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0answers
33 views

Can I force nfsd on Solaris to announce more free space than physically available?

I'm working with various Solaris based distributions (OmniOS, SmartOS, Nexenta) and I have a highly compressible and deduplicable data set on a very small amount of high performance storage. The ...
2
votes
1answer
131 views

Is it possible to disable zfs self-healing without disabling checksums?

I would like to disable ZFS self-healing in case of scenario as described here: https://pthree.org/2013/12/10/zfs-administration-appendix-c-why-you-should-use-ecc-ram/ In that scenario bad RAM (ECC or ...
4
votes
3answers
2k views

MongoDB and ZFS bad performance: disk always busy with reads while doing only writes

I have huge performance issues using MongoDB (i believe it is mmapped DB) with ZFSonlinux. Our Mongodb is almost only writes. On replicas without ZFS, disk is completely busy for ~5s spikes, when app ...
2
votes
2answers
385 views

How can I determine what RAIDZ level my volume is using?

I am looking at a ZFS volume on FreeBSD system, and I have no idea what RAIDZ level it is configured at. How can I find out using the ZFS command line or other? I tried "zpool status" already, and ...
1
vote
1answer
115 views

ZFS snapshots and atomic updates

So I'm tinkering around with ZFS on linux and zrep. I've got 2 VMs on my laptop and I'm running zrep and synchronizing the contents of one filesystem to another. One unexpected situation is this: ...
4
votes
2answers
406 views

ZPOOL replace defective disk in exported pool

Yesterday, I put a new disk into my server. Sadly, I didn't check the disk before of failures. I added it to my pool with the command zpool add nas ...
3
votes
2answers
1k views

zpool status reports error … what next?

On our FreeNAS server, zpool status gives me: pool: raid2 state: ONLINE status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. ...
3
votes
4answers
604 views

Does ZFS cache Compressed or Uncompressed data in a ZFS file-system with compression turned on?

ZFS supports file-system compression and it also caches frequently or recently accessed data. If a system has lots of CPU but the underlying data storage system is slow. It is possible that ZFS would ...
0
votes
2answers
322 views

Scale-out distributed storage with snapshots

I'm aware there are many similar questions around, several with great answers. I still haven't quite found what I'm looking for though: a distributed, scale-out FS that supports snapshots. Gluster ...
-1
votes
2answers
2k views

ZFS didn't expand free space after add [closed]

I recently expanded my storage pool "zstorage" by adding two more drives. It had 3 3TB drives in RAID-Z, and I added two more 1.5TB drives also in RAID-Z (which I understand is effectively the same as ...
2
votes
1answer
1k views

FreeNAS: “swap_pager: I/O error - pagein failed”

Our FreeNAS server log is constantly filling up with Apr 5 15:13:49 Wheelhouse NAS kernel: swap_pager: I/O error - pagein failed; blkno 524312,size 4096, error 6 Apr 5 15:13:49 Wheelhouse NAS ...
0
votes
2answers
2k views

FreeNAS: “/var: write failed, filesystem is full”

Upon logging into our FreeNAS via shell, it says /var: write failed, filesystem is full So I did > df -h Filesystem Size Used Avail Capacity Mounted on /dev/ufs/FreeNASs2a ...
2
votes
2answers
3k views

Need to identify disk in zpool … how?

I need to replace a bad disk in a zpool on FreeNAS. zpool status shows gptid/5fe33556-3ff2-11e2-9437-f46d049aaeca UNAVAIL 0 0 0 cannot open How do I find the serial # of that disk? ...
0
votes
0answers
825 views

Any disadvantage of running a virtual machine using files for its drives hosted on freenas/zfs?

I recently got tired of the really slow I/O reads and latency (10-30 MB/s read, not sure for latency but very slow) from a provider I rent a virtual machine from. He uses freenas, the virtual machine ...
5
votes
2answers
2k views

How can I monitor HP P410 hardware RAID degraded in Freenas

I would like to run freenas on a HP P410 hardware RAID 5 4x600GB 15k SAS array and be alerted in the case of physical disk failure, however the freenas documentation says: to prevent problems, do ...
0
votes
0answers
3k views

ZFS import unable to find any pools

I had a ZFS pool -- a mirror containing 2 vdevs -- running on a FreeBSD server. I now have only one of the disks from the mirror, and I am trying to recover files from it. The ZFS data sits in a GPT ...
3
votes
1answer
798 views

FREENAS: Why isn't mv command instant within a RAIDZ1 volume?

I'm currently 'reorganizing' file structure within a RAIDZ1 volume. Moving directories from one dataset to another, which are both contained on the same volume. SSH'ed into the machine and did a ...
1
vote
2answers
80 views

How to use a file as a zpool?

If I do dd if=/dev/zero of=/tank/test/zpool bs=1M count=100 how can I treat the file /tank/test/zpool as a vdev, so I can use it as a zpool? It is for zfs testing purposes only.
0
votes
1answer
3k views

freenas zfs read performance sucks .. why?

I just set up a freenas zfs raid-z2 with 4 drives sata enterprise drives and doing some performance tests. Right now I'm pushing and pulling linux images into the storage. My notebook has a samsung ...
1
vote
1answer
1k views

Is it possible to remove a drive from zfs?

I have a zfs raid-z1 with too much storage volume. I thought of taking out one volume. Is it possible to remove a drive from a zfs raid storage? thx for your help
2
votes
1answer
2k views

Is it possible to change zfs raid-z1 to raid-z2 or raid-z3 on freenas?

I have a running freenas zfs on raid-z1. For safety i though of increasing parity. Enough spare space is available. Is it possible to upgrade a zfs raid-z1 to raid-z2 or raid-z3? thx for your help
2
votes
2answers
364 views

Why does zfs fail to cache this workload when “normal” filesystems cache it completely?

Update: because recordsize defaults to 128k, the amount of data read by the test program is much larger than the ARC on an 8GB system and still slightly larger than the ARC on a 16GB system. Reducing ...
-1
votes
1answer
814 views

ZFS checksum errors: what files are affected?

Here is a zfs pool with checksum errors: NAME STATE READ WRITE CKSUM pool0 ONLINE 0 0 42 c1t1d0 ONLINE 0 0 30 c1t2d0 ONLINE ...
0
votes
1answer
129 views

Samba intermittently timing out on writes to a ZFS share

I'm experiencing an odd problem on a file server intermittently failing when writing files. The problem occurs when I try to write a number of files from a (Windows 7) client at once. ...
-1
votes
1answer
1k views

zpool import with missing device

I had two geli-encrypted partitions on separate disk in a zpool as simple disks (no raid*). I didn't want redundancy for all files, only for some selected datasets (for which I set copies=2). Now one ...
1
vote
2answers
586 views

How to check that all ZFS snapshots within a pool are without holds before destroying that pool

Question Already I can check each snapshot of a filesystem individually, manually. I would prefer to check all at once (all with a single command or script). Please: can that be done with a ...
1
vote
4answers
1k views

NFS IO priority on ZFS/Solaris

I've got a Nexenta/ZFS NAS that I'm using as an NFS backing store for a small VMware vSphere farm. At the moment I have 9x1TB disks all mirrored (last disk is configured as a write log device). The ...
4
votes
3answers
4k views

When using thin-provisioning with ZFS, how do you make sure you don't run out of physical disk space?

Forgive me if this seems like a fundamental question, but I couldn't really find anything concrete on Google, and I'm not a system administrator by trade. We are setting up a SAN at our office using ...
6
votes
2answers
649 views

What to call ZFS vdev that won't change?

I've got an Ubuntu (13.04) Desktop with ZFS support thanks to the PPA zfs-native/stable. Everything was working really well. I created a RAID-Z1 pool called inground with the following command: ...
3
votes
1answer
361 views

“zpool create” hangs indefinitely

I have a Solaris 11.1 machine which has some disks attached to it via an expander (LSISAS2X36) through an LSI 1068 controller. The setup used to work quite decently, but as I have added another batch ...
0
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0answers
170 views

zfs recovery after hardware failure

My ZFS storage hardware failed including the rpool disks. I installed a new server and tried to import use zfs import -f poolname. I am able to see the pool and the disk utilized. But I am not able to ...