FreeBSD 10.1 + Samsung 850 EVO + ZFS + TRIM

[Michael Fuckner]

Hi,

I believe the Problem is the mfi controller which also does RAID and trim can not be done through mfi.

Go for an HBA,
 Michael!

Am 18.09.2015 08:35 schrieb Tim Gustafson <tjg at ucsc.edu>:
>
> Hi, 
>
> I've Google this around a bit, but I seem to be getting some 
> conflicting information so I'm hoping I can get this cleared up here. 
>
> I have a shiny new Dell PowerEdge R630 with four 1TB Samsung EVO SSDs 
> installed and configured as a RAID 0+1 zpool: 
>
>   pool: tank 
> state: ONLINE 
>   scan: scrub repaired 14.5K in 0h13m with 0 errors on Thu Sep 17 20:47:17 2015 
> config: 
>
>         NAME             STATE     READ WRITE CKSUM 
>         tank           ONLINE       0     0     0 
>           mirror-0       ONLINE       0     0     0 
>             mfisyspd0p3  ONLINE       0     0     0 
>             mfisyspd1p3  ONLINE       0     0     0 
>           mirror-1       ONLINE       0     0     0 
>             mfisyspd3p3  ONLINE       0     0     0 
>             mfisyspd2p3  ONLINE       0     0     0 
>
> errors: No known data errors 
>
> I was investigating whether or not TRIM support was working, so I did: 
>
> root at host: sysctl -a | grep trim 
> vfs.zfs.vdev.trim_on_init: 1 
> vfs.zfs.vdev.trim_min_active: 1 
> vfs.zfs.vdev.trim_max_active: 64 
> vfs.zfs.vdev.trim_max_bytes: 2147483648 
> vfs.zfs.vdev.trim_max_pending: 64 
> vfs.zfs.trim.enabled: 1 
> vfs.zfs.trim.txg_delay: 32 
> vfs.zfs.trim.timeout: 30 
> vfs.zfs.trim.max_interval: 1 
> kstat.zfs.misc.zio_trim.bytes: 0 
> kstat.zfs.misc.zio_trim.success: 0 
> kstat.zfs.misc.zio_trim.unsupported: 546 
> kstat.zfs.misc.zio_trim.failed: 0 
>
> That seems to imply that the OS thinks that this drive does not 
> support TRIM, but all the documentation about the 850 drives indicates 
> that they do support TRIM.  Indeed, camcontrol reports that TRIM is 
> supported, but (if I'm reading this correctly) not enabled: 
>
> root at host: camcontrol identify /dev/pass0 
> pass0: <Samsung SSD 850 EVO 1TB EMT01B6Q> ATA-9 SATA 3.x device 
> pass0: 150.000MB/s transfers, Command Queueing Enabled 
>
> protocol              ATA/ATAPI-9 SATA 3.x 
> device model          Samsung SSD 850 EVO 1TB 
> firmware revision     EMT01B6Q 
> serial number         S21CNXAG526512L 
> WWN                   5002538840009228 
> cylinders             16383 
> heads                 16 
> sectors/track         63 
> sector size           logical 512, physical 512, offset 0 
> LBA supported         268435455 sectors 
> LBA48 supported       1953525168 sectors 
> PIO supported         PIO4 
> DMA supported         WDMA2 UDMA6 
> media RPM             non-rotating 
>
> Feature                      Support  Enabled   Value           Vendor 
> read ahead                     yes      yes 
> write cache                    yes      yes 
> flush cache                    yes      yes 
> overlap                        no 
> Tagged Command Queuing (TCQ)   no       no 
> Native Command Queuing (NCQ)   yes              32 tags 
> NCQ Queue Management           no 
> NCQ Streaming                  no 
> Receive & Send FPDMA Queued    yes 
> SMART                          yes      yes 
> microcode download             yes      yes 
> security                       yes      no 
> power management               yes      yes 
> advanced power management      no       no 
> automatic acoustic management  no       no 
> media status notification      no       no 
> power-up in Standby            no       no 
> write-read-verify              yes      no      0/0x0 
> unload                         no       no 
> general purpose logging        yes      yes 
> free-fall                      no       no 
> Data Set Management (DSM/TRIM) yes 
> DSM - max 512byte blocks       yes              8 
> DSM - deterministic read       no 
> Host Protected Area (HPA)      yes      no      1953525168/1 
> HPA - Security                 no 
>
> So, my guess is that while the drive supports TRIM, perhaps FreeBSD 
> has disabled TRIM for this drive, perhaps because of the buggy TRIM 
> firmware issues with some drives?  I thought those issues were present 
> in the 840 series, but not in the 850 series.  Or am I not reading 
> these screens correctly? 
>
> - 
>
> -- 
>
> Tim Gustafson 
> tjg at ucsc.edu 
> 831-459-5354 
> Baskin Engineering, Room 313A 
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