[mythtv-users] What is best filesystem for recordings?

[Andre Newman]

On 1 Jul 2015, at 15:48, Simon Hobson <linux at thehobsons.co.uk> wrote:

> Andre Newman <mythtv-list at dinkum.org.uk> wrote:
> 
>> What happens when you do rewrite? Does the drive cache the rewritten tracks until it gets to the guard band?
> 
> I believe these drives do handle that internally. That's when the reviews mention I/O speed dropping to zero for a while as the drive goes into a "read - modify - write" operation on a big chunk of data. Unless it's got a huge buffer, then it's also going to be limited in how much write-data it can cache since it'll need to keep enough space for the entire track group it needs to read-modify-write.

I was also concerned as to what will happen if the power fails in the middle of one of these read modify write operations, some(most?) SSDs have backup capacitors to keep things going for long enough but I doubt that’s possible for a mechanical drive! There seems to be a potential for a lot of corrupted tracks.

Well, seems we have a couple of Myth Guinea Pigs, I’ll be interested to hear how these drives work out.
> 
> 
> You do need to be careful, I was reading a review of a new drive a few weeks back (forget the details, apart from being IIRC 10TB SMT) which is designed to be engineered into a storage appliance and which needs host OS support for it. Different drives, different markets.
> Oh, here it is : http://www.theregister.co.uk/2015/06/09/hgst_packs_shingles_to_make_10tb_drive/

I had some vague recollection of driver/OS support being needed, I must have read the same article.

> 
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