Re: Home Directory in SSD

I have a Desktop system and it has an SSD.  On that system I also have an internal terrabyte hard disk for backups.  One is /scratch, /backup1  and reserved.

Because I do little with some Directories I move a few of them to /scratch

I partitioned that hard disk into three equal partitions. I mounted one partition as /scratch and the second partition as /backupOn the scratch I set permissions to 1777 (owned by root)  
I then moved my /Downloads, /Documents /Videos /Music to /scratch
(eg I created /scratch/Downloads    /scratch/Documents etc.)I then did a rmdir ~/Downloads ~/Documents ~/Music, and ~/Videos 
and the added symbolic links   
ln -s /scratch/Documents Documentsln -s /scratch/Downloads Downloadsln -s /scratch/Music    Musicln -s /scratch/Pictures Pictures
ln -s /scratch/Videos  Videos
So, as far as I am concerned, I have put what I do not require onto the /scratch partition of the non-SSD drive./, /boot, /root, /home, ~ ,  ~/Dropbox and ~/Development and ~/Desktop and swap remain where they are on the SSD.
My system has 2 users /other (a non admin) and /leslie (admin)  with their heavy activities relegated to compiling, testing, and running a virtual machine or two.The "other" user (which I called other) is vanilla in regards to assignments. All other's files and folders are on the SSD. I use it for most activities that do not require administrator privileges).
My 4 gig Ram laptop has a straight 120 gig SSD, replacing an older 300gig hard disk. The laptop benefited from the SSD for previously mentioned reasons,
One extra benefit for the laptop  -- longer battery life (no spinning disk) and cooler operation.

 Regards 
 Leslie
 Mr. Leslie Satenstein
Montréal Québec, Canada



 
      From: Matus UHLAR - fantomas <[email protected]>
 To: [email protected] 
 Sent: Sunday, February 7, 2016 11:49 AM
 Subject: 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/
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