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The warning messages about the file descriptor leaking are indeed harmless, and are being tracked in bug 592834. You might want to contribute your findings there; I'm not sure Colin (the maintainer) has been able to reproduce the bug in this instance...


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My answer has 2 parts: investigation of the block device driver; an optimisation worth looking at with your use case. Investigation of Hardware I understood that for the same application but on 2 different hardware the performance is very different and you would like to understand why. Therefore I propose first a mean to help you find an answer for the ...


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jbd2 process is for ext4 journalling. It is logical that filesystem needs to write into journal during mysql commits, this should not be reason for any worries. The amount of load caused by jbd is influenced by your mount parameters for dm-10-8 and dm-14-8 partitions. It is probably desirable to have very conservatiove journalling at database partition to ...


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Stephen Kitt already answered your question properly, but since you mentioned 'constraints of using software RAID', there is one other issue that can waste a bit of space and that's the size of the RAID metadata. In theory RAID metadata is really small, a few kilobytes at most. In practice mdadm reserves quite a lot of space for its metadata. In your case ...


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There are a couple of reasons for the confusion here. SSD drives are often advertised as "raw" capacity, which includes all the overprovisioning for faulty sectors. So a 64GB device might actually have only 60GB usable space. Disks are specified in 10^n units, so 64GB is (64*10^9) bytes. Memory and computer users' frequent expectations are based around 2^m ...


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Your drives aren't set up entirely as RAID10 devices. Each of your four drives is partitioned into three partitions, one containing approximately 16.8GB (I'm using SI GBs here), one containing 524MB, and one containing 45.7GB. The set of four 16.8GB partitions is assembled into md1, a 16.8GB RAID1 device (md1: active raid1; all four partitions are mirrored, ...



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