Re: ZFS secondarycache on SSD problem on r255173

This is a recent bit of code by Justin cc'ed, so he's likely the best person to
investigate this one.

    Regards
    Steve
----- Original Message ----- 
From: "Dmitryy Makarov" <supportme_at_ukr.net>
To: <freebsd-current_at_freebsd.org>
Sent: Friday, September 13, 2013 12:16 PM
Subject: ZFS secondarycache on SSD problem on r255173


> Hello, FreeBSD Current. 
> 
> Have some trouble with adding SSD drive as secondarycache device on 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r255173 : 
> SSD INTEL SSDSC2BW180A4 
> 
> dmesg: 
> ada1 at ahcich2 bus 0 scbus4 target 0 lun 0 
> ada1: <INTEL SSDSC2BW180A4 DC02> ATA-9 SATA 3.x device 
> ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) 
> ada1: Command Queueing enabled 
> ada1: 171705MB (351651888 512 byte sectors: 16H 63S/T 16383C) 
> ada1: quirks=0x1<4K> 
> ada1: Previously was known as ad8 
> 
> 
> # diskinfo -v /dev/ada1 
> /dev/ada1 
> 512 # sectorsize 
> 180045766656 # mediasize in bytes (167G) 
> 351651888 # mediasize in sectors 
> 4096 # stripesize 
> 0 # stripeoffset 
> 348861 # Cylinders according to firmware. 
> 16 # Heads according to firmware. 
> 63 # Sectors according to firmware. 
> BTDA326504N51802GN # Disk ident. 
> 
> Creating partition and adding: 
> # gpart create -s gpt ada1 
> # gpart add -t freebsd-zfs -s3G -l zil0 ada1 
> # gpart add -t freebsd-zfs -l cache0 ada1 
> # zpool add disk1 log /dev/gpt/zil0 
> # zpool add disk1 cache /dev/gpt/cache0 
> 
> After that have: 
> log 
> 
> gpt/zil0 ONLINE 0 0 0 
> cache 
> gpt/cache0 ONLINE 0 0 0 block size: 512B configured, 4096B native 
> 
> But why? ZFS can't properly set sector size for cache device (quirks=0x1<4K>)? 
> And have some strange behavior with ZIl partition on the same SSD - everything works! 
> 
> 
> Okay, was trying to do some workaround with GNOP: 
> # gnop create -S4096 /dev/gpt/cache0 
> # zpool add disk1 cache /dev/gpt/cache0.nop 
> 
> Seems to be OK 
> cache 
> gpt/cache0.nop ONLINE 0 0 0 
> 
> But after reboot pool has 
> status:One or more devices are configured to use a non-native block size. 
> Expect reduced performance. 
> 
> cache 
> gptid/39e40c33-1c4d-11e3-ac20-002590aa9548 ONLINE 0 0 0 block size: 512B configured, 4096B native 
> 
> And no gnop parts was found, and even gpart (in /dev/gpart) 
> 
> # gnop status 
> # gnop: Command 'status' not available. 
> 
> # gpart show -l ada1 
> => 34 351651821 ada1 GPT (167G) 
> 34 6 - free - (3.0k) 
> 40 6291456 1 zil0 (3.0G) 
> 6291496 345360352 2 cache0 (164G) 
> 351651848 7 - free - (3.5k) 
> 
> # ls /dev/gpt/cache* 
> zsh: no matches found: /dev/gpt/cache* 
> 
> 
> Please, help to deal with this problem. 
> Or what else information can be useful to find out this trouble. 
> _______________________________________________
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