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Subject: Re: News : ARM Trying to Buy AmperComputing
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From: "186282@ud0s4.net" <186283@ud0s4.net>
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Date: Tue, 21 Jan 2025 19:17:55 -0500
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On 1/21/25 2:56 PM, Rich wrote:
> D <nospam@example.net> wrote:
>> [-- text/plain, encoding 8bit, charset: utf-8, 94 lines --]
>>
>>
>>
>> On Mon, 20 Jan 2025, 186282@ud0s4.net wrote:
>>
>>> On 1/20/25 3:53 PM, D wrote:
>>>>
>>>>
>>>> On Mon, 20 Jan 2025, The Natural Philosopher wrote:
>>>>
>>>>> On 20/01/2025 09:30, D wrote:
>>>>>>>
>>>>>>>   The Pi hat or OMV ?
>>>>>>
>>>>>> The pi, with directly connected spinning disks. Does the hat have its own
>>>>>> extra power supply?
>>>>>
>>>>> I've managed to get a P4 I think to run one spinning rust disk without
>>>>> extra power.
>>>>> Strictly it depends on the disk.
>>>>> The pi hat for 5 drives has an external 60W PSU
>>>>
>>>> Ahh, if it has an external PSU then there is no problem. Ideally, if the pi
>>>> hat for 5 drives is intended to accomodate 5 spinning drives, it would be
>>>> nice if it did so at full speeds.
>>>
>>>
>>>   One review said the WRITEs were a little pokey,
>>>   but not TOO bad. READs were apparently snappy.
>>>
>>>   This is OK ... most stuff on HDDs is "write once /
>>>   read more often".
>>
>> Hmm, do you have a link? What does "a little pokey" mean in terms of
>> writes? If it is only performance and latency related, then it is ok,
>> since the software will take care of a lot of that for me.
> 
> The nymshift troll was likely referring to two possibilities:
> 
> 1) SMR mechanical drives
> 2) SSD's
> 
> In both cases, writes have to be done in what amounnts to a "two step
> process".
> 
> For SMR drives, because the magnetic tracks physically overlap, writes
> get queued to a non SMR area, and then get "moved" to the actual disk
> sectors as a bigger batch to maintain the proper "overlap" of the
> magnetic tracks.
> 
> For SSD's, writes occur to an "erased" flash block (typically much
> larger than a "disk sector" size used by the host) and given enough
> writes over a short enough timeframe the SSD controller can run out of
> "pre-erased" blocks to use, and when that happens write speed slows
> down to the rate that can be done when a "block erase" has to occur
> before the actual writes can hit the media.  Note that this "block
> erase" can also invove moving any partially used data sectors out of
> the block into another block, creating a "write amplification"
> situation as well.


   Disks - magnetic or SSD - are kinda messy. Of course
   their mission is kinda messy - deal with odd-sized
   blobs of data, try to jam it in somewhere, maybe have
   to move pre-existing around, try not to create TOO
   many 'gaps', for years and years.

   SSDs are quicker regardless and use less power, but
   that doesn't mean they're just a petabyte of empty
   space, STUFF has to happen. SSDs trend smaller than
   HDDs too and are more $$$ per terabyte. Yer basic
   WD/Seagte magnetic laptop drives are a pretty good
   deal IF you can handle the power req.

   Made a "different building" aux backup unit using
   a Pi-3 and 2.5" USB mag drive. The idea was to
   keep the Most Important Stuff in a separate
   building, separate leg of the power system. Used
   wi-fi ... but had all day to do its thing. This
   was protection against lighting/surges/fires
   and the dreaded Giant Mug Of Coffee that might
   afflict the main NAS. Cheap, worked great, a
   Python pgm to do the backups (DO confirm yer
   USB and NAS are both mounted). The USB drive
   was powered by the Pi, not an external wart.
   The drive and Pi were taped together and the
   whole mess was velcroed to the underside of a
   shelf out in a shop building.