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#filesystems

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Jonathan Matthews

Folks who know "rsync -F" because they already use it -- am I right in thinking that it adds these behaviours to a sync:

- recursively look for .rsync-filter files in every directory in the copy source, including the top-level

- apply the filters they each contain to the directory and subdirectories rooted at the same level that each file was found

- exclude those .rsync-filter files from being copied to the destination

Is that right? #rsync #sync #data #sysadmin #filesystem #filesystems

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JdeBP

@cks

The same thought occurred to me. There have been cute tricks like that played. I've even played some of them on other systems.

But as far as I know that first entry in the i-node table was just unused.

I wonder whether fsck even checked it. Modern FreeBSD fsck_ffs does, but that's a very different beast.

#Unix#filesystems#FFS
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JdeBP

@cks

Off By One Error in your post on this. (-:

Since 0 means a free directory entry, that's only 65535 i-nodes.

Mind you, at 8 i-nodes per block, you'd come close to the size of some contemporary discs with a maximally sized i-node table.

#Unix#filesystems
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JdeBP

@spacehobo @brouhaha

Yes. Berkeley FFS broke things up into cylinder groups and had an allocation policy of putting various things in the same CG and other things not, because much the same idea was also useful for reducing seeks on discs.

(Even OS/2 got in on the act. (-: Its FAT filesytem driver put the extended attributes record for every file in front of the file data where it could. Which was why it was a bad idea to defragment the "EA DATA. SF" file so that it ended up stuffed all at the start of the volume.)

And the elevator algorithm in the block cache would at least make the tape do straight runs in one direction and then rewind, where it could.

Putting filesystem *and* swap on tape boggles the mind, though. (-:

#Unix#magtape#filesystems
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Christian Brauner 🦊🐺

Picked backed up the work for VFS {g,u}id squashing. IOW, mapping all {g,u}ids down to a single {g,u}id. Any process that doesn't have that {g,u}id but is still privileged otherwise will write to disk as the squashed {g,u}id. I just finished a draft and selftests that miraculously work.

web.git.kernel.org/pub/scm/lin

Probably "bugs galore" at this point. Needs more thinking.

web.git.kernel.orgkernel/git/vfs/vfs.git - VFS tree
#linux#kernel#vfs
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Danie van der Merwe

5 ways ZFS is superior to Btrfs for storing data

“ZFS and Better File System (Btrfs) are two popular modern file systems. Both are designed with advanced storage features and offer snapshot capabilities, data integrity protection, and highly efficient storage management. However, ZFS has been the ...continues

See gadgeteer.co.za/5-ways-zfs-is-

GadgeteerZA · 5 ways ZFS is superior to Btrfs for storing data“ZFS and Better File System (Btrfs) are two popular modern file systems. Both are designed with advanced storage features and offer snapshot capabilities,
#filesystems#technology
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Stefano Marinelli

One of the main criticisms I read about ZFS (mainly OpenZFS) in forums and articles is that "it's not well integrated into Linux."
It's true - there is a licensing issue, and that shouldn't be underestimated. However, I believe it's wrong to judge it based on this - on FreeBSD, it is perfectly integrated (not to mention the various illumos-based OSes), and in my opinion, it should be judged for what it is, not for its integration into the different Linux distributions.

#OpenZFS#ZFS#FileSystems
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James Young

Surely someone's looked into this: if I wanted to store millions or billions of files on a filesystem, I wouldn't store them in one single subdirectory / folder. I'd split them up into nested folders, so each folder held, say, 100 or 1000 or n files or folders. What's the optimum n for filesystems, for performance or space?
I've idly pondered how to experimentally gather some crude statistics, but it feels like I'm just forgetting to search some obvious keywords.
#BillionFileFS #linux #filesystems #optimization #benchmarking

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Dendrobatus Azureus

¿This relay has been closed indefinitely due to user abuse right @gyptazy ?

I'm correcting myself, why leaving the error up. I see that I've convoluted two different services

It is a beautiful FediVerse relay service
Thank you for the time that you've taken to set it up for us all

fedi-relay.gyptazy.com/

🖋️ #bash #sh #zsh #ksh #csh #freeBSD #FediVerse #OpenRelay #openBSD #netBSD #ZFS #Filesystems #Linux #POSIX #Programming

Screen capture which shows the "AodeRelay" app information page. The top displays "AodeRelay v0.3.116-main-6ff7b597 on fedi-relay.gyptazy.com". Below, an "About" section details the app as a free Fediverse relay service supporting smaller instances, particularly single-user setups, by improving visibility and connectivity. It's powered by ActivityPub software and supports platforms like Mastodon, Pleroma, and GoToSocial. The bottom shows a website address "fedi-relay.gyptazy.com" and a "Rules" section. A number "16" and three icons are also visible at the bottom right.
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Dendrobatus Azureus

HDD SSD space should be counted in binary.

1KB in binary is 1024.

A 32 TB hard drive is in fact 30.517578125 TB unpartitioned /unformatted capacity, as the binary system on the computer actually uses it

I know about all those confusing terms that you can find when you go and search on different engines; those are just to confuse and convolute the fact that drives sold are under capacity

Counting storage in decimals is a crime, a marketing scheme which should have been outlawed globally.

#FileSystems#HDD#SSD
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