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We recently had a disk fail in our RAID6 array (within warranty) and got it RMA-ed by Seagate. The disk I sent them was a Seagate Constellation ES.2 (ST33000650NS). The disk they returned was a Seagate Constellation ES.3 (ST3000NM0033).

Old disk:
SATA 6 GB/s 7200 RPM 64 MB Cache @ 3 TB

New disk:
SATA 6 GB/s 7200 RPM 128 MB Cache @ 3 TB

Is the fact they have different cache sizes going to be an issue if I use this new disk in the array, where all the other disks have 64 MB caches?

I don't think it should be a problem (although there might b some minor if not undetectable performance issues?) but any thoughts appreciated.

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  • Does your RAID use disk cache? Commented Nov 4, 2016 at 14:41

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This won't be a problem, especially since it's the MANUFACTURER'S recommended and sanctioned replacement.

Go ahead and replace the drive...

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    @Alex What ewwhite said. Please note, if this drive failed on hours, consider replacing the other drives too. In other words, if the array has been in use for 3 years or more, the drive probably failed on end of life, and the others are due to fail as well. Commented Nov 4, 2016 at 15:14

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