search for: wafl

Hello ! I'm very interested in btrfs development and I have general questions about it. Please accept my apologizes if they are dumb as I'm new to this area, and I just want to learn.. 1. Like the btrfs name implies (b-trees fs..) I guess that it works basically like WAFL (and ZFS), is that right ? 2. Are there any big differences between btrfs-wafl-zfs or only small ones ? 3. NetApp claims that ZFS has infringed a set of their patents. They say that "ZFS was a conscious reimplementation of their WAFL filesystem". What about btrfs ? isn't there a ris...

On Tue, Nov 08, 2005 at 08:04:54AM -0800, Bryan J. Smith wrote: > > > NAS offers safe concurent access (generally, there might be > > some NAS devices outthere that do not). NAS device will > > manage file system internally, and export it over NFS or > > SMB protocols to the clients. > > Such NAS' are a combined host+storage aka

Let''s suppose you rename a file or directory. /tank/widgets/a/rel2049_773.13-4/somefile.txt Becomes /tank/widgets/b/foogoo_release_1.9/README Let''s suppose you are now working on widget B, and you want to look at the past zfs snapshot of README, but you don''t remember where it came from. That is, you don''t know the previous name or location where that

...plaintext messages) to a NetApp Nearstore (basically a filer with SATA rather than FC disk) mounted over NFS. I want to do this in such a way that the NetApp automatic snapshots are kept as small as possible, so hopefully several versions of the mailstore can be stored "live" (the NetApp WAFL filesystem "stores" disk blocks as they are changed). After some experimenting, I discovered that I needed "--no-whole-file" as well as "--inplace" otherwise rsync copies the entire file by default for "local" copying, including over NFS (and so the whole pr...

Hi, we use attachment dedup with lots of emails (still migrating to it from maildir). We use netapp storage with wafl filesystem over nfs. Problem is that netapp has hard limit of 100k hardlinks to one file. And we encountered it. Problem is that dovecot start do segfault (lmtp,dsync,pop3 etc) when it happend when tried to deliver new emails with that attachment. Here is strace of dsync: 6740 link("/nfsmnt/...

...39; process of dovecot was performing a 'chown' call on the directory, with an end result of the previous mode 2700 being changed to 0700. Now I understand that on some filesystems, a 'chown' call can end up losing any setuid or setgid bits on an inode - and apparently Netapp's WAFL file system is one of them. Looking at the dovecot source code, I *believe* the source of the chown call is in src/lib/nfs-workarounds.c function nfs_flush_chown_uid - where a 'chown' call is being used to flush NFS attribute caches? for what I believe is the purposes of ascertaining file...

...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, the Netapp uses WAFL, also a variety of copy-on-write. The LUNs appear as large files on the filer. It won''t know which blocks are in use by ZFS. It would have to do copy-on-write each time, I suppose. Do we have a problem here? The Netapp has a utility that will defragment files on a volume. It must put...

Not sure if it''s been posted yet, my email is currently down... http://weblog.infoworld.com/yager/archives/2007/10/suns_zfs_is_clo.html Interesting piece. This is the second post from Yager that shows solaris in a pretty good light. I particularly like his closing comment: "If you haven''t checked out ZFS yet, do, because it will eventually become ubiquitously implemented

Hi guys, During my refresh to latest linux, I noticed, direct mapping of all non-RAM pages in xen_set_identity_and_release(). I currently don''t map all at front, but as needed looking at the PAGE_IO bit in the pte. One result of that is minor change to common code macro: __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) to to __set_fixmap(idx, phys, PAGE_KERNEL_IO_NOCACHE)

...at > zfs-discuss-owner at opensolaris.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of zfs-discuss digest..." > > > Today''s Topics: > > 1. Re: How do I get my pool back? (Solaris) > 2. Re: ZFS/WAFL lawsuit (Rob Windsor) > 3. Re: How do I get my pool back? (Peter Tribble) > 4. Re: How do I get my pool back? (Mike Lee) > 5. Re: How do I get my pool back? (Peter Tribble) > 6. Re: How do I get my pool back? (Eric Schrock) > 7. Re: How do I get my pool back? (Marion H...

Hello, We recently deployed Samba 4.5 on Debian Jessie-derived Linux with kernel v4.5.7 sharing an XFS filesystem. We are migrating a large data set from old NetApp filers to the Samba share. While attempting to monitor the progress of the migration, we are observing very slow population of filesystem metadata in the Properties window (specifically the General tab for info like "Size"

...ddresses remains in newer versions of Windows Explorer. Can you do any performance tests on the local filesystem to see if this is due to XFS xattr performance ? If you're migrating a lot of ACLs across we will probably hit the xattr code very hard. NetApp may be reference counting the ACLs on WAFL.

...; performing a 'chown' call on the directory, with an end result of the > previous mode 2700 being changed to 0700. > > Now I understand that on some filesystems, a 'chown' call can end up > losing any setuid or setgid bits on an inode - and apparently Netapp's > WAFL file system is one of them. > > Looking at the dovecot source code, I *believe* the source of the > chown call is in src/lib/nfs-workarounds.c function > nfs_flush_chown_uid - where a 'chown' call is being used to flush NFS > attribute caches? for what I believe is the purpo...

m.roth at 5-cent.us wrote: > Matt Garman wrote: > >>We have a "compute cluster" of about 100 machines that do a read-only >>NFS mount to a big NAS filer (a NetApp FAS6280). The jobs running on >>these boxes are analysis/simulation jobs that constantly read data off >>the NAS. > > <snip> > *IF* I understand you, I've got one question:

Jeremy There is NetApp simulator that may help you ! Check now.netapp.com -- Yair

Hello, Just a few quick, but not very simple questions...: Do any Linux filesystems (besides XFS) support freezing? (ie. in conjuction with LVM snapshots this can allow a mounted filesystem to be frozen [freezing all processes writing to this filesystem] in a valid state (with possibly dangling unlinked files), the device can be snapshotted via LVM, and the original filesystem unfrozen - the

...of Windows Explorer. > > Can you do any performance tests on the local > filesystem to see if this is due to XFS xattr > performance ? If you're migrating a lot of ACLs > across we will probably hit the xattr code > very hard. NetApp may be reference counting > the ACLs on WAFL.

I've just subscribed, but a search of the archive doesn't indicate this has been handled before... Is there a way to get rsync to not create a new file while transferring and then rename it, but to instead update the existing file in place, i.e. simply write those blocks that have been updated and leave the rest alone? That would be ideal for what I wanted rsync for, namely updating

Hello, I found a posting on the mailing list from 2008 "Adding new storage backend to Dovecot" while searching for POP3 and IMAP servers, that allow to use a NoSQL backend rather than a traditional file system. The problem with traditional filesystems is, that they are very limited. You cannot easily extend it, even with RAID 10 all messages may be lost due to a RAID controller

Hi. System is snv_56 sun4u sparc SUNW,Sun-Fire-V440, zil_disable=1 We see many operation on nfs clients to that server really slow (like 90 seconds for unlink()). It''s not a problem with network, there''s also plenty oc CPU available. Storage isn''t saturated either. First strange thing - normally on that server nfsd has about 1500-2500 number of threads. I did