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Forum Discussion
NVX Business Edition total Max HDD Capacity?
I have an NVX Business Edition with four 2TB drives in it. I want to replace all of them with 3TB or 4TB drives. Will the NVX handle the 12TB or 16TB capacity and if so can I expand the array the usu...
daztrue wrote:
Thanks for clarifying that. Can you also confirm whether or not Rotation Vibration Safeguard is listed amongst specs of drives with such? I know it sounds obvious but I haven't always seen this spec when searching for drives on HCL confirmed to have RVS.
I believe the name RVS was first used by Hitachi (now hgst). There are other names for similar features used by other manufacturers. WDC calls it "3D Active Balance™ Plus", Seagate includes the feature as part of their "NASWorks™ technology" in the VN disks. The basic feature is to compensate for vibration from a nearby disk (in the adjacent bays). All NAS-purposed drives and enterprise drives should have this feature. I don't see any reason to use desktop drives in a NAS any more, now that NAS purposed drives are available from both Seagate and WDC.
If cache size invisible to NAS/PC what purpose does it serve and is NAS/PC faster? If so, what difference will 64MB have from 32MB on x86 NAS?
The cache is memory inside the disk drive that improves the performance of the disk. The disk can save data in that memory, and then optimize the order of writes. Also, if something was just read/written, and then is read again, the disk can return the data without accessing the platter. All things being equal, a disk with a large cache will have better performance than a disk with a smaller cache.
The NAS (or PC) can't access this cache, it is internal to the disk drive and is managed by the disk itself.
StephenB wrote:All things being equal, a disk with a large cache will have better performance than a disk with a smaller cache.
The NAS (or PC) can't access this cache, it is internal to the disk drive and is managed by the disk itself.
Thanks again, very informative. However, the cache info raised further questions: does it matter if discs in the same array have different sized caches? And could those with a higher cache cause 'strain' or potential disruption of some kind to those with a lower cache - or the whole array?
I've no idea what the cache size of my existing discs is. Is it simply down to disc model number or can I find out on the disc or in settings somehow?
daztrue wrote:
However, the cache info raised further questions: does it matter if discs in the same array have different sized caches? And could those with a higher cache cause 'strain' or potential disruption of some kind to those with a lower cache - or the whole array?No, it doesn't matter. Your ReadyNAS handles mixed drives very well, so there is no problem with different cache sizes.
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