similar to: ZFS, COW, write(2), directIO...

I see that Pinguy OS, an uber-Ubuntu o/s, includes native ZFS support. Any pointers to more info on this? -- David

The big problem that I have with non-directio is that buffering delays program execution. When reading/writing files that are many times larger than RAM without directio, it is very apparent that system response drops through the floor- it can take several minutes for an ssh login to prompt for a password. This is true both for UFS and ZFS. Repeat the exercise with directio on UFS and there is no

I have a ZFS pool that has been corrupted. The pool contains a single device which was actually a file on UFS. The machine was accidentally halted and now the pool is corrupt. There are (of course) no backups and I''ve been asked to recover the pool. The system panics when trying to do anything with the pool. root@:/$ zpool status panic[cpu1]/thread=fffffe8000758c80: assertion failed:

I had to let this go and get on with testing DB2 on Solaris. I had to abandon zfs on local discs in x64 Solaris 10 5/08. The situation was that: * DB2 buffer pools occupied up to 90% of 32GB RAM on each host * DB2 cached the entire database in its buffer pools o having the file system repeat this was not helpful * running high-load DB2 tests for 2 weeks showed 100%

hi all Try to learn how UFS root to ZFS root liveUG work. I download the vbox image of s10u8, it come up as UFS root. add a new disks (16GB) create zpool rpool run lucreate -n zfsroot -p rpool run luactivate zfsroot run lustatus it do show zfsroot will be active in next boot init 6 but it come up with UFS root, lustatus show ufsroot active zpool rpool is mounted but not used by boot Is this a

Is there a ZFS equivalent (or alternative) of inotify? You have some thing, which wants to be notified whenever a specific file or directory changes. For example, a "live" sync application of some kind... -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hi matt, I have some problems about understanding zfs COW implemention. Suppose b and c are both children dir of a, if c changes, there will be new versions of both a and c, namely c'' and a''. a a'' b c c'' Because ''..'' in b points to a before this change, shall we modify b to let ''..'' point to a''? If yes,

Why does ZFS report such small directory sizes? For example, take a maildir directory with ten entries: total 2385 drwx------ 8 17121 vmail 10 Jun 8 23:50 . drwx--x--x 14 root root 14 May 12 2006 .. drwx------ 5 17121 vmail 5 May 25 18:16 .Trash drwx------ 5 17121 staff 6 Jun 9 00:01 .testing -rw------- 1 17121 staff 0 Jun

Hi, I was suffering for weeks from the following problem: a zfs dataset contained an automatic snapshot (monthly) that used 2.8 TB of data. The dataset was deprecated, so I chose to destroy it after I had deleted some files; eventually it was completely blank besides the snapshot that still locked 2.8 TB on the pool. ''zfs destroy -r pool/dataset'' hung the machine within seconds

Hello, I''m quite interested in ZFS, like everybody else I suppose, and am about to install FBSD with ZFS. On that note, i have a different first question to start with. I personally am a Linux fanboy, and would love to see/use ZFS on linux. I assume that I can use those ZFS disks later with any os that can work/recognizes ZFS correct? e.g. I can install/setup ZFS in FBSD, and later use

Hi, I''m still debating wether I should use ZFS or not and how. Here is my scenario. I want to run a server with a lot of storage, that gets disks added/upgraded from time to time to expand space. I''d want to store large files on it, 15mb - 5gb per file, and they''d only need to be accessible via NFS/FTP and maybe CIFS. The machine I have dedicated for this job would be

>> How do i compile mbuffer for our system, Thanks to Mike Futerko for help with the compile, i now have it installed OK. >> and what syntax to i use to invoke it within the zfs send recv? Still looking for answers to this one? Any example syntax, gotchas etc would be much appreciated. -- Kind regards, Jules free. open. honest. love. kindness. generosity. energy. frenetic.

OK, I know that there''s been some discussion on this before, but I''m not sure that any specific advice came out of it. What would the advice be for supporting a largish number of users (10,000 say) on a system that supports ZFS? We currently use vxfs and assign a user quota, and backups are done via Legato Networker. >From what little I currently understand, the general

Hi, I have OpenSolaris on an Amd64 Asus-A8NE with 2gig of Rams and 4x320 gig sata drives in raidz1. With dd, I can write at quasi disk maximum speed of 80meg each for a total of 250meg/s if I have no Xsession at all (only console tty). But as soon as I have an Xsession running, the write speed drops to about 120MB/s. Its even worse if I have a VBoxHeadless running with an idle win2k3 inside. It

Currently I''m trying to figure out the best zfs layout for a thumper wrt. to read AND write performance. I did some simple mkfile 512G tests and found out, that per average ~ 500 MB/s seems to be the maximum on can reach (tried initial default setup, all 46 HDDs as R0, etc.). According to http://www.amd.com/us-en/assets/content_type/DownloadableAssets/ArchitectureWP_062806.pdf I would

We run our IMAP spool on ZFS that''s derived from LUNs on a Netapp filer. There''s a great deal of churn in e-mail folders, with messages appearing and being deleted frequently. I know that ZFS uses copy-on- write, so that blocks in use are never overwritten, and that deleted blocks are added to a free list. This behavior would spread the free list all over the zpool. As well,

Suppose I have a single ZFS pool on a single disk; I want to upgrade the system to use two different, larger disks and I want to mirror. Can I do something like: - I start with disk #0 - add mirror on disk #1 (resilver) - replace first disk (#0) with disk #2 (resilver) Casper

Apologies if this post is inappropriate to this list; please redirect me if so. Our team uses ssh extensively for server access and maintenance (Debian). An issue is acting as root when operating, for example, over ansible and keeping a record of who performed the actions, something ssh certificates solves well. The problem is then to automate certificate issuance since it would be pretty

On the intro page (http://www.opensolaris.org/os/community/zfs/intro/) it states that "ZFS has ''adaptive endianness'' to cope with different byte order on different platforms". However in the PDF (ZFS: The Last Word in File Systems) on page 3 it states "Not portable between platforms (e.g. x86 to/from SPARC)" So is it or isn''t it? Thanks, John. This

I build two zfs filesystems using b29 (from brandz). I then re-installed solaris express b28, preserving the zfs filesystems. When I tried to "zpool import" my zfs filesystems I got a kernel panic: > debugging crash dump vmcore.0 (32-bit) from blackbird > operating system: 5.11 snv_28 (i86pc) > panic message: > ZFS: bad checksum (read on /dev/dsk/c1d0p0 off 24d5e000: zio