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Re: fusion io
On 14 Jun 2014, at 00:44, MARK CALLAGHAN <mdcallag@xxxxxxxxx> wrote:
> Where can directFS be downloaded? This is open source, right?
From what I gather, there is a public API to this called OpenNVM (http://opennvm.github.io/). But the short answer is that directfs/nvmfs isn't opensource - you only get this if you have a fusion-io card
Fusion-io itself is a commercial product, so nvmfs/directfs is likely from them only (and is probably closed source). I take it others can implement it, but haven't (yet?) ?
MariaDB's initial implementation of it is here:
(and I presume this was then ported to Percona Server as well -- http://www.percona.com/doc/percona-server/5.6/performance/atomic_fio.html)
It seems the magic is at:
#define DFS_IOCTL_ATOMIC_WRITE_SET _IOW(0x95, 2, uint)
I found a presentation that talks about it (nothing about the filesystem itself being opensource):
And for reference some older blog posts:
And attached for brevity, is a short chat I had with Jan Lindström who works on the fusion-io code now:
11:42 < bytee> jplindst: our fusion-io work, is based on the open APIs at
11:46 < jplindst> bytee: To be totally honest, I have no idea what are the API
at the http page you mentioned, I have used standard POSIX
interfaces to access FusionIO storage, thus you will need
FusionIO SSD card and NVMFS file system
11:47 < bytee> jplindst: nvmfs file system - where does one get it ? from
11:47 < jplindst> bytee: FusionIO card is naturally commercial product, nvmfs
to current my understanding does not work with any other
11:48 < bytee> jplindst: ok, likely because others haven't implemented it
11:48 < jplindst> bytee: correct
11:49 < jplindst> bytee: If you have the card you should have the file system
11:50 < bytee> jplindst: thanks
11:51 < jplindst> bytee: Last time we did discuss with FusionIO the actual file
system was not yet open source
11:51 < jplindst> bytee: not sure if that has been changed now that
announcements are out
11:51 < bytee> jplindst: doubt there is, from what i gathere
I hope this helps
> On Tue, Jun 10, 2014 at 5:18 PM, Daniel Black <daniel.black@xxxxxxxxxxxxx> wrote:
> Thanks Colin. Missed that line of the doco and/or assumed it was a capability of another file-system.
> ----- Original Message -----
> > Special ioctl doesn't work unless you use directfs (you're using
> > ext4); see:
> > https://mariadb.com/kb/en/fusionio-directfs-atomic-write-support/
> > On Wednesday, 11 June 2014, Daniel Black < daniel.black@xxxxxxxxxxxxx
> > > wrote:
> > Hi,
> > I'm trying to get innodb_use_atomic_writes = 1 working on an ext4 on
> > top of LVM on a ioDrive device with a RHEL6 kernel
> > 2.6.32-358.6.2.el6.x86_64
> > and getting the following error. Which bit(s) need to change to get it
> > working?
> > 140611 7:43:46 InnoDB: Operating system error number 25 in a file
> > operation.
> > InnoDB: Error number 25 means 'Inappropriate ioctl for device'.
> > InnoDB: Some operating system error numbers are described at
> > InnoDB:
> > http://dev.mysql.com/doc/refman/5.5/en/operating-system-error-codes.html
> > InnoDB: File name ./ibdata1
> > InnoDB: File operation call: 'ioctl'.
> > InnoDB: Error in opening ./ibdata1
> > --
> > --
> > Daniel Black, Engineer @ Open Query ( http://openquery.com.au )
> > Remote expertise & maintenance for MySQL/MariaDB server environments.
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> Daniel Black, Engineer @ Open Query (http://openquery.com.au)
> Remote expertise & maintenance for MySQL/MariaDB server environments.
> Mailing list: https://launchpad.net/~maria-discuss
> Post to : maria-discuss@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~maria-discuss
> More help : https://help.launchpad.net/ListHelp
> Mark Callaghan
Colin Charles, Chief Evangelist, SkySQL - The MariaDB Company
blog: http://bytebot.net/blog/| t: +6-012-204-3201 | Skype: colincharles