Re: Home Directory in SSD

>Am Sonntag, 7. Februar 2016, 00:57:24 CET schrieb Matus UHLAR - fantomas:
>> I consider two possibilities for my home PC
>> 1. mirror SSD and HDD (I currently have two old 120 HDDs in mirror)

On 07.02.16 11:12, Martin Steigerwald wrote:
>I think this can be done with regular rsync or btrfs send/receive.

I think this is much more like running backups to HDD than RAID, so I would
better avoid this...

>I probably wouldn´t try to use BTRFS RAID 1 or SoftRAID 1, cause I think the
>slower disk will slow down write accesses.

Should not be a problem, especially for someone who runs the solution for
being safe against SSD issues.

>Also I am not sure whether the RAID
>implementations are aware of disk speed and for example shuffle most of the
>reads to the SSD in that case. I bet they aren´t (yet).

This should be AFAIK no problem. You can even speed up the HDD to avoid
reads by marking it write-mostly.

>> 2. using bcache, dm-cache or flashcache (cache HDD on SSD)
>
>If you use bcache with write caching you basically double your risk of data
>loss.

double? explain, please.

>> maybe someone could share experience with some of these...
>
>bcache worked in a test more than a year ago I think. But I don´t use it, so…
>no idea about long term reliability.
>
>And alternative is also using a hybrid harddisk that uses a little amount of
>flash as caching. You have one device and its all transparent. But you have
>lots of logic in firmware. Seagate does these, I am not sure whether other
>vendors do these meanwhile as well.

hybrid HDD is very nice alternative, and in fact it is what I would
like to "emulate" using either flash cache mechanism mentioned above.
The main difference is that current hybrids only have 8GB of cache, so the
speedup is not that noticeable.

-- 
Matus UHLAR - fantomas, [email protected] ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Boost your system's speed by 500% - DEL C:\WINDOWS\*.*