Comments on: Combine your partition space with mhddfs. http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/ An Eclectic IT Repository Fri, 01 Apr 2011 01:19:34 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Keith http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-397 Keith Fri, 01 Apr 2011 01:19:34 +0000 http://blog.mindlesstechie.net/?p=120#comment-397 Just wanted to say that I find mhddfs to be great. I've been using mdadm/lvm setups for a few years now, and while they've been nearly painless for me - my current SATA/RAID cards in a home server are dying and I keep putting off replacement in order to do new drives/new array with new cards in order to get it all done at once. As such I've gone to individually lvm'd drives, then linked into an mhddfs pool. It's the perfect holdover for 6 months until I can see myself replacing the whole array in equal or greater size, in order to migrate what data I've been able to retain from previous failures. Just wanted to say that I find mhddfs to be great. I’ve been using mdadm/lvm setups for a few years now, and while they’ve been nearly painless for me – my current SATA/RAID cards in a home server are dying and I keep putting off replacement in order to do new drives/new array with new cards in order to get it all done at once. As such I’ve gone to individually lvm’d drives, then linked into an mhddfs pool. It’s the perfect holdover for 6 months until I can see myself replacing the whole array in equal or greater size, in order to migrate what data I’ve been able to retain from previous failures.

]]> By: mau king http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-343 mau king Fri, 07 Jan 2011 11:33:05 +0000 http://blog.mindlesstechie.net/?p=120#comment-343 This is wonderful!!! I was looking for something like this for a very long time. I am continuously testing it on different configurations of HDD, partitions and filesystems; it works flawlessly! There is hardly any change in speed. The data is stored on HDDs/partitions in a distributed manner. For end user there is one large drive. Lets say, If you have 4 drives and data is spread across all of them and if a hard disk crashes, all the data on three HDD will remain intact and can be retrieved. This is wonderful!!!
I was looking for something like this for a very long time.
I am continuously testing it on different configurations of HDD, partitions and filesystems; it works flawlessly!
There is hardly any change in speed. The data is stored on HDDs/partitions in a distributed manner. For end user there is one large drive. Lets say, If you have 4 drives and data is spread across all of them and if a hard disk crashes, all the data on three HDD will remain intact and can be retrieved.

]]> By: Dirk Gently http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-109 Dirk Gently Thu, 29 Jan 2009 07:28:35 +0000 http://blog.mindlesstechie.net/?p=120#comment-109 Good tip, I thought that I'd need to do this as one of my partitions grows too large. Thanks. Good tip, I thought that I’d need to do this as one of my partitions grows too large. Thanks.

]]> By: John Alberts http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-108 John Alberts Tue, 27 Jan 2009 16:02:17 +0000 http://blog.mindlesstechie.net/?p=120#comment-108 I actually haven't used the filesystem yet, but in reading the documentation, it looks like you will only lose the data on the drive that failed. There is no striping of data across drives and no parity, so the only data affected should be on the failed drive. Which drive is chosen seems to depend on the configuration of parameters such as mlimit. I actually haven’t used the filesystem yet, but in reading the documentation, it looks like you will only lose the data on the drive that failed. There is no striping of data across drives and no parity, so the only data affected should be on the failed drive.
Which drive is chosen seems to depend on the configuration of parameters such as mlimit.

]]> By: docatomic http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-107 docatomic Sun, 25 Jan 2009 20:26:08 +0000 http://blog.mindlesstechie.net/?p=120#comment-107 How is it for recovery? Say you have four drives and you want to combine them into one big happy storage space - and then a year later, one drive fails. Let's be generous, and say it's the last of the four that died; let's be even more generous, and assume a filesystem capacity usage of only 50% just prior to the failure. Finally; let's be realistic, and further assume that since they're all 1TB drives backups have not been made because DVD-R discs are too small and Blu-Ray discs or large SCSI tapedrives are both too expensive. How much will be lost, and would anything be directly recoverable? Is this method striped, like the 'JBOD' pseudo-RAID method used in FreeNAS, or is it strictly a linear concatenation? How is it for recovery? Say you have four drives and you want to combine them into one big happy storage space – and then a year later, one drive fails. Let’s be generous, and say it’s the last of the four that died; let’s be even more generous, and assume a filesystem capacity usage of only 50% just prior to the failure. Finally; let’s be realistic, and further assume that since they’re all 1TB drives backups have not been made because DVD-R discs are too small and Blu-Ray discs or large SCSI tapedrives are both too expensive.

How much will be lost, and would anything be directly recoverable? Is this method striped, like the ‘JBOD’ pseudo-RAID method used in FreeNAS, or is it strictly a linear concatenation?

]]> By: Steve Dibb http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-105 Steve Dibb Tue, 20 Jan 2009 16:58:18 +0000 http://blog.mindlesstechie.net/?p=120#comment-105 Yah, I'm actually using LVM right now, but I don't wanna stick more drives into my case to make the thing overheat. So I'm gonna move to external drives (probably USB), and I can't use LVM with those. So this should really come in handy. :) Yah, I’m actually using LVM right now, but I don’t wanna stick more drives into my case to make the thing overheat. So I’m gonna move to external drives (probably USB), and I can’t use LVM with those. So this should really come in handy. :)

]]> By: John Alberts http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-103 John Alberts Tue, 20 Jan 2009 01:30:16 +0000 http://blog.mindlesstechie.net/?p=120#comment-103 Sure thing. I know I've needed something like this in the past myself. If you have the luck of some forethought, of course, LVM would likely be a better choice, otherwise, this seems like a nice alternative. Sure thing. I know I’ve needed something like this in the past myself. If you have the luck of some forethought, of course, LVM would likely be a better choice, otherwise, this seems like a nice alternative.

]]> By: Steve Dibb http://blog.mindlesstechie.net/2009/01/19/combine-your-partition-space-with-mhddfs/comment-page-1/#comment-102 Steve Dibb Tue, 20 Jan 2009 00:21:24 +0000 http://blog.mindlesstechie.net/?p=120#comment-102 Oh wow, man, this is exactly what I've been looking for! Awesome, thanks. :) Oh wow, man, this is exactly what I’ve been looking for! Awesome, thanks. :)

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