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NeddySeagoon
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PostPosted: Wed May 24, 2017 7:02 pm    Post subject: USB to SATA Bridges Reply with quote

Team,

I have a USB powered USB3.1 to SATA bridge that I use ta attach an SSD to a Raspberry Pi. The Pi does not power the SSD.
The SSD supports trim but the USB to SATA bridge does not. I suitably panned it in my Amazon review :)

I can work around the missing trim by fitting the SSD to a computer without the USB bridge, mounting the filesystems and running fstrim.
So far so good. It a bit of a faff but should work.
However, swap is on the SSD too. It not mounted, its not a filesystem ... how do I trim that?
The raspberry Pi can use a lot of swap too.

If anyone knows a USB3 to SATA bridge that deals with SSDs properly, I would be pleased to hear about it.
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NeddySeagoon

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Maitreya
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PostPosted: Wed May 24, 2017 8:04 pm    Post subject: Re: USB to SATA Bridges Reply with quote

NeddySeagoon wrote:
...
However, swap is on the SSD too. It not mounted, its not a filesystem ... how do I trim that?
The raspberry Pi can use a lot of swap too.


You don't. You can't as there is no record left of what was written.
And the usb conversion removes discard support as well.

Maybe try blkdiscard
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s4e8
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PostPosted: Thu May 25, 2017 1:38 am    Post subject: Reply with quote

Some bridge with proper firmware support TRIM, through you need access it using UAS driver.
Code:

# sdparm -i --page=lbpv /dev/sdh
    /dev/sdh: TOSHIBA   THNSNS128GMCP     0   
Logical block provisioning (SBC) VPD page:
  Unmap command supported (LBPU): 1
  Write same (16) with unmap bit supported (LBWS): 0
  Write same (10) with unmap bit supported (LBWS10): 0
  Logical block provisioning read zeros (LBPRZ): 0
  Anchored LBAs supported (ANC_SUP): 0
  Threshold exponent: 0
  Descriptor present: 0
  Minimum percentage: 0
  Provisioning type: 0
  Threshold percentage: 0
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NeddySeagoon
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PostPosted: Thu May 25, 2017 3:43 pm    Post subject: Reply with quote

Maitreya,

I've discovered that swap is mounted with discard options automatically, so while I'm running fstrim, I can do a swapon too.
Unfortunately, it will need to be every boot, or ever more often as swap is used a lot on a Raspberry pi.

s4e8,
I'm not using the UAS driver as far as I know. I'll look into it.
That. would be a much better solution.



Thank you both.
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NeddySeagoon

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wildhorse
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Joined: 16 Mar 2006
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Location: Estados Unidos De América

PostPosted: Fri May 26, 2017 9:43 am    Post subject: Reply with quote

I replaced my first Raspberry Pi with a Banana Pi a long time ago. By now I have a little farm of Banana Pi (model 1!), Pro and Router (all running a kernel version 4.11). If that is an option for you, then be careful, because a later model (3?) of the Banana actually comes with an internal USB to SATA bridge. Personally, I find life too short for bad wine and USB-SATA bridges.
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NeddySeagoon
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PostPosted: Fri May 26, 2017 9:56 am    Post subject: Reply with quote

wildhorse,

When I can get a real arm64 system for sensible money in the UK, I intend to get one.
There have been a few that have been stillborn, so I'll use the Pi until then.

It needs to have at least 1G RAM per core.
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NeddySeagoon

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