On 31/10/13 13:56, Sharuzzaman Ahmat Raslan wrote:
> Hi Adam,
>
> The low I/O is when the machine is under load.
>
> Thank you for suggesting to use SSD. I have been thinking about that
> as well, but currently, the storage of BackupPC is using a 1TB disk,
> with about 80% utilization.
>
> Changing to 1TB SSD might be a little bit overkill on the customer's
> budget :)
>
Sure, 2 x 480GB SSD in linear RAID is still relatively expensive :) 
though it certainly is a huge performance improvement. BTW, FYI, I get 
2.5GB/s read and 1.5GB/s write performance from my RAID5...

> Maybe I should look at bcache for Linux :)
>
> https://lwn.net/Articles/497024/
> http://bcache.evilpiepirate.org/
>
I've seen that also, but I'm not sure it is a good (stable) solution for 
real use (at least, I'm not prepared to use that for a server yet, your 
tolerance might be different). In addition, it probably won't help the 
backup work load, since you need to read the entire disk, and the entire 
disk won't fit into the cache....

Regards,
Adam

-- 
Adam Goryachev
Website Managers
P: +61 2 8304 0000                    adam AT websitemanagers.com DOT au
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-- 
Adam Goryachev Website Managers www.websitemanagers.com.au

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