John R Pierce wrote:
> On 11/2/2017 9:21 AM, hw wrote:
>> Richard Zimmerman wrote:
>>> hw wrote:
>>>> Next question: you want RAID, how much storage do you need? Will 4
>>>> or 8 3.5" drives be enough (DO NOT GET crappy 2.5" drives - they're
>>>> *much* more expensive than the 3.5" drives, and >smaller disk space.
>>>> For the price of a 1TB 2.5", I can get at least a 4TB WD Red.
>>>
>>> I will second Marks comments here. Yes, 2.5" drive enterprise drives
>>> have been an issue. +1 for the WD Red drives, so far 3.5" w/ 2tb and
>>> 4tb drives, ZERO issues. I've had good luck with HGST NAS drives too.
>>> Unfortunately, that will come to an end soon (With WD owning HGST).
>>
>> Most servers can fit only 2.5" disks these days. I keep wondering what
>> everyone is doing about storage.
>
>
> 2.5" SAS drives spinning at 10k and 15k RPM are the performance solution
> for online storage, like databases and so forth. also make more sense
> for large arrays of SSDs, as they don't even come in 3.5". With 2.5"
> you can pack more disks per U (24-25 2.5" per 2U face, vs 12 3.5" max
> per 2U)... more disks == more IOPS.
>
> 3.5" SATA drives spinning at 5400 and 7200 rpm are the choice for large
> capacity bulk 'nearline' storage which is typically sequentially written
> once
>
We have a fair number of SAS 3.5" drives, and yes, 10k or 15k speeds.
mark