On 4/7/2015 2:36 PM, Jason Matthews wrote:
The results are in. 4k sectors consume 302G for this data set. 512b 202GB 4KB 302GB 8KB 474GB
It seems that George Wilsons modification to the sd driver to let you nail the sector size only works in one direction. You can only specify a sector size larger than the advertisement from the disk. In other words, if the disk is advertising 4k sectors you can specify 8k sectors but not 512 bytes.
This still leaves me with the problem of having 200 512byte DC S3700s and 100 4k DC S3700s. I have to either run them at 4k and loose half of the expensive SSD storage or flash them all to 512 bytes which really sucks.
I still dont understand why we lose so much storage using sector sizes larger than 512 bytes. I need to verify this but the fall out seems to come from compression. I accidently sent a file system over w/o lz4 enabled and it consumed 602GB the same number that mbuffer said it sent. That tells me that the on disk storage is working as advertised but some how compression is falling apart larger sector sizes.
Are there inefficiencies that creep into LZ4 with larger block sizes some how?
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