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i've a NAS with 5 disks in RAID-5. I used it as DataStore for Virtual Box Hard Disk. So i've for example one big (1.5 terabyte) VDI file that contain 200k files. I'm wondering: Is the single file good managed by physical Raid or, for example, my Nas is 'stupid' and save this single file into... a single disk and not 'straied' onto all disks ? Thanks

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up vote 2 down vote accepted

Most NAS devices use a version of linux with the linux mdadm package to manage the raid, if set up as a raid-5 you will get a situation where blocks are spread across all devices part of the array.

For more information about mdadm:

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so, you're confirming that also 1 big file (> 1 terabyte for example) is stored with block spreaded ? – stighy Jun 4 '12 at 13:39
Yes, Even big files are made up of seperate blocks depending on the volume block size (512b/1k/4k etc.) those blocks are spread over the disks trough the Raid rules as in posted link. – Flash Jun 4 '12 at 13:43

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