* [somewhat OT] I just discovered that Stratis uses XFS.
@ 2018-10-02 14:25 Emmanuel Florac
2018-10-02 14:37 ` Emmanuel Florac
2018-10-02 21:46 ` Dave Chinner
0 siblings, 2 replies; 7+ messages in thread
From: Emmanuel Florac @ 2018-10-02 14:25 UTC (permalink / raw)
To: xfs
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Hi all,
in fact I just discovered that Stratis exists :)
(https://stratis-storage.github.io/relnotes/relnotes-1.0.html) ( details
on https://lwn.net/Articles/755454/)
Reading the FAQ (https://stratis-storage.github.io/FAQ.html) I see that
it uses XFS as a filesystem layer. Furthermore it seems to come from
RedHat. What are the relations with the future XFS capabilities that
Dave (IIRC) demonstrated recently?
Sorry for the OT message :)
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [somewhat OT] I just discovered that Stratis uses XFS. 2018-10-02 14:25 [somewhat OT] I just discovered that Stratis uses XFS Emmanuel Florac @ 2018-10-02 14:37 ` Emmanuel Florac 2018-10-02 15:05 ` Eric Sandeen 2018-10-02 21:46 ` Dave Chinner 1 sibling, 1 reply; 7+ messages in thread From: Emmanuel Florac @ 2018-10-02 14:37 UTC (permalink / raw) To: xfs [-- Attachment #1: Type: text/plain, Size: 1266 bytes --] Le Tue, 2 Oct 2018 16:25:30 +0200 Emmanuel Florac <eflorac@intellique.com> écrivait: > Hi all, > in fact I just discovered that Stratis exists :) > (https://stratis-storage.github.io/relnotes/relnotes-1.0.html) > ( details on https://lwn.net/Articles/755454/) > > Reading the FAQ (https://stratis-storage.github.io/FAQ.html) I see > that it uses XFS as a filesystem layer. Furthermore it seems to come > from RedHat. What are the relations with the future XFS capabilities > that Dave (IIRC) demonstrated recently? > > Sorry for the OT message :) Oh, and what about the probable constant use of xfs_growfs? Stratis seems to create all filesystems with a size of 1TB, and extends them as needed from there. However that means that a filesystem could potentially be expanded many times, which, as I understand it, is very suboptimal or worse, can lead to problems (inode allocation, AGs count and structure, etc). -- ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | <eflorac@intellique.com> | +33 1 78 94 84 02 ------------------------------------------------------------------------ [-- Attachment #2: Signature digitale OpenPGP --] [-- Type: application/pgp-signature, Size: 163 bytes --] ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [somewhat OT] I just discovered that Stratis uses XFS. 2018-10-02 14:37 ` Emmanuel Florac @ 2018-10-02 15:05 ` Eric Sandeen 2018-10-02 16:30 ` Emmanuel Florac 0 siblings, 1 reply; 7+ messages in thread From: Eric Sandeen @ 2018-10-02 15:05 UTC (permalink / raw) To: Emmanuel Florac, xfs [-- Attachment #1.1: Type: text/plain, Size: 1707 bytes --] On 10/2/18 9:37 AM, Emmanuel Florac wrote: > Le Tue, 2 Oct 2018 16:25:30 +0200 > Emmanuel Florac <eflorac@intellique.com> écrivait: > >> Hi all, >> in fact I just discovered that Stratis exists :) >> (https://stratis-storage.github.io/relnotes/relnotes-1.0.html) >> ( details on https://lwn.net/Articles/755454/) >> >> Reading the FAQ (https://stratis-storage.github.io/FAQ.html) I see >> that it uses XFS as a filesystem layer. Furthermore it seems to come >> from RedHat. What are the relations with the future XFS capabilities >> that Dave (IIRC) demonstrated recently? >> >> Sorry for the OT message :) > > Oh, and what about the probable constant use of xfs_growfs? Stratis > seems to create all filesystems with a size of 1TB, and extends them as > needed from there. However that means that a filesystem could > potentially be expanded many times, which, as I understand it, is very > suboptimal or worse, can lead to problems (inode allocation, AGs > count and structure, etc). First, a disclaimer: I'm not a Stratis expert. None of Dave's fancy new tricks are in Stratis, because right now Dave's fancy new tricks are pretty much just in his lab. As for the growfs, that's a little bit of a concern - in general, the "start small and grow" worry is that we'll have a bazillion tiny AGs in the result. But if Stratis starts at 1TB it's not terrible; I'd need to look and see how many AGs get created (probably 4?) and if so, 250G AGs are not /too/ granular. If it's creating a lot more smaller AGs, that could become an issue if it gets grown to a very large size. IOWs the growfs concern is mostly about the resulting AG size & AG count. -Eric [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 873 bytes --] ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [somewhat OT] I just discovered that Stratis uses XFS. 2018-10-02 15:05 ` Eric Sandeen @ 2018-10-02 16:30 ` Emmanuel Florac 2018-10-03 22:47 ` Chris Murphy 0 siblings, 1 reply; 7+ messages in thread From: Emmanuel Florac @ 2018-10-02 16:30 UTC (permalink / raw) To: Eric Sandeen; +Cc: xfs [-- Attachment #1: Type: text/plain, Size: 971 bytes --] Le Tue, 2 Oct 2018 10:05:42 -0500 Eric Sandeen <sandeen@sandeen.net> écrivait: > But if Stratis starts at 1TB it's not terrible; I'd need to look and > see how many AGs get created (probably 4?) and if so, 250G AGs are > not /too/ granular. If it's creating a lot more smaller AGs, that > could become an issue if it gets grown to a very large size. IOWs > the growfs concern is mostly about the resulting AG size & AG count. > You're right, I've looked through the source code and no option ever gets passed to mkfs.xfs nor xfs_growfs related to FS size. That means that it creates the FS with the default 4 AGs for a start. -- ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | <eflorac@intellique.com> | +33 1 78 94 84 02 ------------------------------------------------------------------------ [-- Attachment #2: Signature digitale OpenPGP --] [-- Type: application/pgp-signature, Size: 163 bytes --] ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [somewhat OT] I just discovered that Stratis uses XFS. 2018-10-02 16:30 ` Emmanuel Florac @ 2018-10-03 22:47 ` Chris Murphy 2018-10-04 10:27 ` Emmanuel Florac 0 siblings, 1 reply; 7+ messages in thread From: Chris Murphy @ 2018-10-03 22:47 UTC (permalink / raw) To: Emmanuel Florac; +Cc: Eric Sandeen, xfs On Tue, Oct 2, 2018 at 10:30 AM, Emmanuel Florac <eflorac@intellique.com> wrote: > Le Tue, 2 Oct 2018 10:05:42 -0500 > Eric Sandeen <sandeen@sandeen.net> écrivait: > >> But if Stratis starts at 1TB it's not terrible; I'd need to look and >> see how many AGs get created (probably 4?) and if so, 250G AGs are >> not /too/ granular. If it's creating a lot more smaller AGs, that >> could become an issue if it gets grown to a very large size. IOWs >> the growfs concern is mostly about the resulting AG size & AG count. >> > > You're right, I've looked through the source code and no option ever > gets passed to mkfs.xfs nor xfs_growfs related to FS size. That means > that it creates the FS with the default 4 AGs for a start. Stratis volumes are always built on dm-thin so I'd expect default mkfs.xfs to create ~33 AG's, which is what I get when running mkfs.xfs on LVM thin volumes. -- Chris Murphy ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [somewhat OT] I just discovered that Stratis uses XFS. 2018-10-03 22:47 ` Chris Murphy @ 2018-10-04 10:27 ` Emmanuel Florac 0 siblings, 0 replies; 7+ messages in thread From: Emmanuel Florac @ 2018-10-04 10:27 UTC (permalink / raw) To: Chris Murphy; +Cc: Eric Sandeen, xfs [-- Attachment #1: Type: text/plain, Size: 900 bytes --] Le Wed, 3 Oct 2018 16:47:05 -0600 Chris Murphy <lists@colorremedies.com> écrivait: > > > > You're right, I've looked through the source code and no option ever > > gets passed to mkfs.xfs nor xfs_growfs related to FS size. That > > means that it creates the FS with the default 4 AGs for a start. > > Stratis volumes are always built on dm-thin so I'd expect default > mkfs.xfs to create ~33 AG's, which is what I get when running mkfs.xfs > on LVM thin volumes. > Ah yes, interesting. I've created a 1TB thin volume and mkfs.xfs makes 32 AGs indeed. -- ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | <eflorac@intellique.com> | +33 1 78 94 84 02 ------------------------------------------------------------------------ [-- Attachment #2: Signature digitale OpenPGP --] [-- Type: application/pgp-signature, Size: 163 bytes --] ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [somewhat OT] I just discovered that Stratis uses XFS. 2018-10-02 14:25 [somewhat OT] I just discovered that Stratis uses XFS Emmanuel Florac 2018-10-02 14:37 ` Emmanuel Florac @ 2018-10-02 21:46 ` Dave Chinner 1 sibling, 0 replies; 7+ messages in thread From: Dave Chinner @ 2018-10-02 21:46 UTC (permalink / raw) To: Emmanuel Florac; +Cc: xfs On Tue, Oct 02, 2018 at 04:25:30PM +0200, Emmanuel Florac wrote: > Hi all, > in fact I just discovered that Stratis exists :) > (https://stratis-storage.github.io/relnotes/relnotes-1.0.html) ( details > on https://lwn.net/Articles/755454/) > > Reading the FAQ (https://stratis-storage.github.io/FAQ.html) I see that > it uses XFS as a filesystem layer. Furthermore it seems to come from > RedHat. What are the relations with the future XFS capabilities that > Dave (IIRC) demonstrated recently? No relationship at all - the XFS snapshot/subvolume stuff was already being prototyped when I first heard about Stratis. Stratis will be able to use this future XFS functionality however they see fit for their users. Cheers, Dave. -- Dave Chinner david@fromorbit.com ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2018-10-04 17:20 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-10-02 14:25 [somewhat OT] I just discovered that Stratis uses XFS Emmanuel Florac 2018-10-02 14:37 ` Emmanuel Florac 2018-10-02 15:05 ` Eric Sandeen 2018-10-02 16:30 ` Emmanuel Florac 2018-10-03 22:47 ` Chris Murphy 2018-10-04 10:27 ` Emmanuel Florac 2018-10-02 21:46 ` Dave Chinner
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