Date: Fri, 18 Sep 2015 08:55:17 +0200 From: Michael Fuckner <michael@fuckner.net> To: Tim Gustafson <tjg@ucsc.edu> Cc: freebsd-fs@freebsd.org Subject: Re: FreeBSD 10.1 + Samsung 850 EVO + ZFS + TRIM Message-ID: <81c0cff8-2217-4a56-970f-f3964c724156@email.android.com> In-Reply-To: <CAPyBAS6XJ=ysD6GbyE=e9BKBa913NwDBpfKmg0iPcFFj0Fe3cg@mail.gmail.com>
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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@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@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@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@ucsc.edu > 831-459-5354 > Baskin Engineering, Room 313A > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"help
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