TRIM support through ciss

[Dmitry Morozovsky]

Dear colleagues,

I have a DB server with ciss and a bunch of disks (8 SAS + 2 Intel SATA SSD).

However, this setup does not seem to support TRIM on SSDs:

kstat.zfs.misc.zio_trim.bytes: 0
kstat.zfs.misc.zio_trim.success: 0
kstat.zfs.misc.zio_trim.unsupported: 418
kstat.zfs.misc.zio_trim.failed: 0


Excerpt from dmesg about SSD:

da9 at ciss0 bus 0 scbus0 target 9 lun 0
da9: <COMPAQ RAID 0 OK> Fixed Direct Access SCSI-5 device
da9: Serial Number PACCR9SZ7KJS
da9: 135.168MB/s transfers
da9: Command Queueing enabled
da9: 114439MB (234371520 512 byte sectors: 255H 32S/T 28722C)
da9: quirks=0x1<NO_SYNC_CACHE>
da9: Delete methods: <NONE(*)>

the last line bothers me...

Is there any tuning I missed?

Thanks!

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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