3
votes
1answer
30 views

what exactly does fsck do under the covers (for UFS)?

If a computer crashes then the filesystem is an inconsistent state. What exactly is fsck(8) doing to restore to a usable filesystem? Is there a backup table? Is it cross-checking metadata? ...
0
votes
0answers
315 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 ...
2
votes
1answer
52 views

Choosing a zpool size?

Is there a rule of thumb when to create a new zpool instead of expanding the current? Right now I have 100TB and can either expand with another 100TB or create an extra.
1
vote
1answer
442 views

How often should I defrag ZFS pools?

I ZFS scrub once a month which takes ~24 hours for the 72TB. For what I can find about how often I should scrub is: very busy pools, once per week not so busy pools, once per month or run a scrub, ...
6
votes
2answers
507 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 ...
5
votes
3answers
453 views

What is the ZFS ACL limit?

Does anyone know how many user ACL's ZFS can handle? With other words: for how many users can I set ACL's like this one for the same directory? setfacl -m user:test1:rwxpDdaARWcCos:fd----:allow ...
2
votes
1answer
176 views

Why is ZFS replication single threaded?

On my 8 core NAS I see only one core maxed out when ZFS replication over SSH is running. I would expect that transferring a snapshot would scale perfectly with the number or cores, as the snapshot ...
6
votes
1answer
1k views

Does ZFS replace the need for hardware/software RAID?

I want to provide protection against data loss on my servers. Typically, I'd use hardware RAID 1 or 5, but I've been reading up on ZFS. Is it correct that ZFS itself provides RAID 1 or 5 like data ...
3
votes
2answers
277 views

Join multiple filesystems (on multiple computers) into one big volume

Scenario: Have 10 computers, each have 12x2TB HDDs (currently) in raidZ2 (10+2) configuration, so, in the each computer i have one approx. 20TB volume. Now, need those 10 separate computers ...
1
vote
2answers
388 views

How to share USB drive via NFS on FreeBSD

I'm trying to share USB hard drive with msdosfs connected like this: mount_msdosfs -o large /dev/da1s1 /mnt/usb I can see mounted drive: /dev/da1s1 on /mnt/usb (msdosfs, local) but when I'm ...
4
votes
2answers
861 views

FreeBSD 9 - default file system?

What will the default file system be in FreeBSD 9?
8
votes
2answers
1k views

Is it safe to replicate from Solaris ZFS to FreeBSD ZFS?

Is it safe to replicate from a Solaris 10 ZFS v22 to a FreeBSD 8.3 ZFS v28? Are there someone that have done this with specific versions of ZFS, where it worked perfectly?
2
votes
4answers
10k views

How to format a partition under FreeBSD

I want to format a partition under FreeBSD and change it to UFS filesystem. I searched the web but even the "fdisk" man page is not clear at all. Any help would be clearly appreciated ! My current ...
2
votes
3answers
2k views

Free space on ZFS file system unexpectedly missing

Going to completely rephrase this question since it's still an outstanding production issue several months later. I have a FreeNAS 0.7.2 box, based on FreeBSD 7.3-RELEASE-p1, running ZFS with 4x1TB ...
1
vote
2answers
521 views

Strange ZFS hidden filesystem problem

Half of my ZFS filesystems are hidden in ZFS-fuse. Here's my story: So, I love ZFS. I used it for about six months on FreeBSD, but due to it crashing the kernel during heavy inter-filesystem IO load, ...
0
votes
2answers
1k views

Can fsck on ufs cause data loss?

I'm on FreeBSD8. I have a problem with a partition. I can't mount it. It says "Operation not permitted." I run fsck -t ufs /dev/da0p1. After it finish the operation, I can mount it successfully. But ...
3
votes
3answers
542 views

Is MINFREE old hat?

On FreeBSD systems, and presumably a bunch of others, there is an amount of space reserved for root which is MINFREE% of the total capacity. With multi-terabyte filesystems, the default of 8% is a ...
2
votes
5answers
2k views

Max total files in a directory in FreeBSD 6 ufs?

Is there an upper limit to the total number of files stored in a single subdirectory in FreeBSD 6? The filesystem is ufs
1
vote
2answers
168 views

Gjournaling a general purpose server on small network

I have a general purpose (mail, web, file, etc) server running on a small mixed (Windows/FreeBSD) network. I'm not pleased with how I laid out the disk originally and since it's rather out of date ...