Comments on: SSD: Free space and write performance http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/ Percona's MySQL & InnoDB performance and scalability blog Sat, 11 Feb 2012 16:45:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: howard http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-771222 howard Thu, 12 Aug 2010 08:21:30 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-771222 can you test it in the normal disk?so they can compassion. can you test it in the normal disk?so they can compassion.

]]> By: K http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-770600 K Tue, 03 Aug 2010 21:19:55 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-770600 It would be interesting to see, if there is any change in this regard with latest release of FusionIO drivers (2.1 driver + Firmware v5.0.1, rev 42895) K It would be interesting to see, if there is any change in this regard with latest release of FusionIO drivers (2.1 driver + Firmware v5.0.1, rev 42895)

K

]]> By: Vadim http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769781 Vadim Wed, 21 Jul 2010 18:12:32 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769781 Normann, As I understand it that is protection that you do not overuse space, which would lend to further performance degradation. Normann,

As I understand it that is protection that you do not overuse space, which would lend to further performance degradation.

]]> By: Vadim http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769780 Vadim Wed, 21 Jul 2010 18:10:29 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769780 Farid, Not in this case. From the script you can see that card was formatted for each individual size. Farid,

Not in this case. From the script you can see that card was formatted for each individual size.

]]> By: Farid http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769763 Farid Wed, 21 Jul 2010 12:33:23 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769763 Does the poor performance come from the non-support of TRIM in Fusio IO ? Does the poor performance come from the non-support of TRIM in Fusio IO ?

]]> By: Normann http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769586 Normann Sun, 18 Jul 2010 21:34:52 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769586 if the performance is pretty much the same between space reservation and the 25% reservation why should I wast 25%? And are the IO's affected too? thx if the performance is pretty much the same between space reservation and the 25% reservation why should I wast 25%?
And are the IO’s affected too?
thx

]]> By: Patrick Casey http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769583 Patrick Casey Sun, 18 Jul 2010 20:39:54 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769583 Haytham, I don't think the data above shows that Fusion IO has bad performance over time; rather it shows that it has poor performance when *full*, doesn't it? To show performance as a function of time you'd have to fill the card to some constant level (say 50%) and then run it that way for some period of time wouldn't you? Mind you in practise storage fills up over time, so I'd expect most real world use cases to involve progressively less free space as time passes, but that's not a function of the equipment. Haytham,

I don’t think the data above shows that Fusion IO has bad performance over time; rather it shows that it has poor performance when *full*, doesn’t it?

To show performance as a function of time you’d have to fill the card to some constant level (say 50%) and then run it that way for some period of time wouldn’t you?

Mind you in practise storage fills up over time, so I’d expect most real world use cases to involve progressively less free space as time passes, but that’s not a function of the equipment.

]]> By: Vadim http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769547 Vadim Sun, 18 Jul 2010 06:40:51 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769547 Haytham, I think if you see performance getting worse on FusionIO over time - it is again related to space consumption. I for sure will do benchmarks on OCZ RevoDrive as soon as have it on the hands, I do not see it yet available for purchase. Haytham,

I think if you see performance getting worse on FusionIO over time – it is again related to space consumption.
I for sure will do benchmarks on OCZ RevoDrive as soon as have it on the hands, I do not see it yet available for purchase.

]]> By: Haytham http://www.mysqlperformanceblog.com/2010/07/17/ssd-free-space-and-write-performance/comment-page-1/#comment-769546 Haytham Sun, 18 Jul 2010 05:28:16 +0000 http://www.mysqlperformanceblog.com/?p=3366#comment-769546 Fusion IO is well known for it's bad performance over time. So I would like to invite you to test another SSD drive that use SandForce controller. If you could perform the same test on OCZ RevoDrive it will be great and helpful. Here is my reference about Fusion IO bad performance: http://www.pcper.com/article.php?aid=913&type=expert&pid=10 Fusion IO is well known for it’s bad performance over time. So I would like to invite you to test another SSD drive that use SandForce controller. If you could perform the same test on OCZ RevoDrive it will be great and helpful.

Here is my reference about Fusion IO bad performance:
http://www.pcper.com/article.php?aid=913&type=expert&pid=10

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