Re: LSI SAS2008 SATA TRIM not working

[Chang Limin <changlimin@h3c.com>]

Kurt Miller <kurt <at> intricatesoftware.com> writes:

> 
> On Thu, 2014-02-06 at 18:56 -0500, Kurt Miller wrote:
> > Various sources indicate that LSI's SAS2008 controllers support TRIM
> > when running their IT firmware (LSI [1] and this list [2]). However, I
> > have not been able to get it working with Dell PERC H200 or H310 cross
> > flashed into LSI IT firmware. Currently I'm testing with Samsung 840 EVO
> > SATA SSDs. I have tried various LSI IT firmware versions (P14, P16, P18)
> > and various Linux distributions (Ubuntu 13.10, Ubuntu 12.04, Ubuntu 14
> > beta, RHEL 7 beta, Fedora 19).
> >
> > Is TRIM working for anyone using LSI SAS2008 controllers?
> 
> It turns out yes, TRIM is working for LSI SAS2008 controllers. However,
> the Samsung 840 EVO's are not compatible with it and are also missing
> from the LSI compatibility list for the controller [1]. When I got my
> hands on an SSD that is on the list, TRIM worked as expected.
> 
> [1] http://www.lsi.com/downloads/Public/Host%20Bus%20Adapters/Host%20Bus
> %20Adapters%20Common%20Files/LSI_6Gb_SAS_SATA_HBA_Compatibility_List.pdf
> 
> Regards,
> -Kurt
> 
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> 

I find the Hitachi HUS110 disk storage also does not support fstrim, 
actually it supports unmap. 
The reason is the lbpme in 'sg_readcap -16' return 0, but the unmap in 
'sg_vpd -p 0xb2' return 1. 
Maybe the storage is not fully compatible to the SCSI standard.

# sg_readcap -16 /dev/dm-2
Read Capacity results:
   Protection: prot_en=0, p_type=0, p_i_exponent=0
   Logical block provisioning: lbpme=0, lbprz=1

# sg_vpd --page=0xb2 /dev/dm-2
Logical block provisioning VPD page (SBC):
  Unmap command supported (LBPU): 1
  Write same (16) with unmap bit supported (LBWS): 1