----- Original Message -----
Hi Mark,
On 14 Jun 2014, at 00:44, MARK CALLAGHAN <mdcallag@gmail.com> 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
Further more after talking to a fusionio engineer directfs development has stopped 2 years ago and is unsupported by them. opennvm was mentioned as its replacement though I've got him digging up some closed source stuff too. Lets see if I get a nvmfs. Despite the opennvm.github.io claims it looks like mariadb doesn't support it as it isn't a filesystem nor does it implement some ioctl, its a pure API that directly operates on the /dev/fio* device. Seems like some documentation is quite out of date. I'll let you know how I get on in about a week.
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: http://lists.askmonty.org/pipermail/commits/2013-March/004529.html (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): http://www.slideshare.net/fusionio/perconalive-accelerating-mysql-in-open-so...
And for reference some older blog posts: https://blog.mariadb.org/significant-performance-boost-with-new-mariadb-page... https://blog.mariadb.org/mariadb-introduces-atomic-writes/
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 http://opennvm.github.io/ correct? 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 fusion-io ? 11:47 < jplindst> bytee: FusionIO card is naturally commercial product, nvmfs to current my understanding does not work with any other device 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 module 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
cheers, -colin
On Tue, Jun 10, 2014 at 5:18 PM, Daniel Black <daniel.black@openquery.com> 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@openquery.com
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@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-discuss More help : https://help.launchpad.net/ListHelp
-- Mark Callaghan mdcallag@gmail.com
-- Colin Charles, Chief Evangelist, SkySQL - The MariaDB Company blog: http://bytebot.net/blog/| t: +6-012-204-3201 | Skype: colincharles
-- -- Daniel Black, Engineer @ Open Query (http://openquery.com.au) Remote expertise & maintenance for MySQL/MariaDB server environments.