Date: Thu, 28 Nov 2013 12:51:36 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Richard Kojedzinszky" <krichy@cflinux.hu>, <freebsd-fs@freebsd.org> Subject: Re: ssd for zfs Message-ID: <03CB6E4FFD454EBA9E416813A5187C9F@multiplay.co.uk> References: <alpine.BSF.2.00.1311270946260.70091@pi.nmdps.net>
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FreeBSD has TRIM support and some disks have very slow TRIM support.
Try disabling TRIM support in /boot/loader.conf
vfs.zfs.trim.enabled=0
Also check to see if your seeing ashift 12 as I suspect thats actually
a 4k not 512b device. This can be confirmed by looking at the boot
output.
Regards
Steve
----- Original Message -----
From: "Richard Kojedzinszky" <krichy@cflinux.hu>
To: <freebsd-fs@freebsd.org>
Sent: Wednesday, November 27, 2013 8:51 AM
Subject: ssd for zfs
> Dear fs developers,
>
> Probably this is not the best list to report my issue, but please forward
> it to where it should get.
>
> I bought an SSD for my ZFS filesystem to use it as a ZIL. I've tested it
> under linux, and found that it can handle around 1400 random synchronized
> write IOPS. Then I placed it into my freebsd 9.2 box, and after attaching
> it as a ZIL, my zpool only performs 100 (!) write iops. I've attached it
> to an AHCI controller and to an LSI 1068 controller, on both it behaves
> the same. So I expect that something in the scsi layer is different,
> FreeBSD is handling this device slower, but actually it can handle the
> 1400 iops as tested under linux.
>
> Please give some advice where to go, how to debug, and how to improve
> FreeBSD's performance with this drive.
>
> The device is:
> # camcontrol identify ada3
> pass4: <STEC MACH16 M16SD2S-50UI 00000299> ATA-8 SATA 2.x device
> pass4: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 512bytes)
>
> protocol ATA/ATAPI-8 SATA 2.x
> device model STEC MACH16 M16SD2S-50UI
> firmware revision 00000299
> serial number STM0001680E8
> WWN 5000a7203006f8e5
> media serial number STEC MACH16 M16SD2S-50UI STM00
> cylinders 16383
> heads 15
> sectors/track 63
> sector size logical 512, physical 512, offset 0
> LBA supported 97696368 sectors
> LBA48 supported 97696368 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
> 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 yes no
> write-read-verify no no
> unload no yes
> free-fall no no
> Data Set Management (DSM/TRIM) yes
> DSM - max 512byte blocks yes 8
> DSM - deterministic read yes any value
> Host Protected Area (HPA) yes no 97696368/97696368
> HPA - Security no
>
> Regards,
>
> Kojedzinszky Richard
> _______________________________________________
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>
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