Date: Thu, 12 Dec 2013 01:16:09 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: freebsd-geom@FreeBSD.org Subject: Is TRIM working with gmirror? Message-ID: <52A90049.7050001@quip.cz>
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Is TRIM working on gmirror?
I have FreeBSD 8.4-RELEASE-p1 amd64 GENERIC machine with 2x SSDs:
<Samsung SSD 840 PRO Series DXM05B0Q> ATA-9 SATA 3.x device
They are partitioned with gpart GPT scheme: ada2p2 + ada3p2
There is gmirror gm1ssdp2 on top of these two partitions:
mirror/gm1ssdp2 COMPLETE ada2p2 (ACTIVE)
ada3p2 (ACTIVE)
SSD it-self has support for TRIM
# camcontrol identify ada2
pass2: <Samsung SSD 840 PRO Series DXM05B0Q> ATA-9 SATA 3.x device
pass2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
protocol ATA/ATAPI-9 SATA 3.x
device model Samsung SSD 840 PRO Series
firmware revision DXM05B0Q
serial number S1ANNSAD760349A
WWN 50025385a00b57ec
cylinders 16383
heads 16
sectors/track 63
sector size logical 512, physical 512, offset 0
LBA supported 250069680 sectors
LBA48 supported 250069680 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 no no
write-read-verify yes no 0/0x0
unload no no
free-fall no no
data set management (TRIM) yes
But there is a WARNING at boot:
WARNING: /ssd_db: TRIM flag on fs but disk does not confirm that it
supports TRIM
The filesystem is classic UFS2.
Is TRIM supported throught gmirror, or not?
Miroslav Lachman
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