Date: Thu, 28 Apr 2016 07:48:46 +0200 From: Gerrit =?ISO-8859-1?Q?K=FChn?= <gerrit.kuehn@aei.mpg.de> To: Gary Palmer <gpalmer@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: zfs on nvme: gnop breaks pool, zfs gets stuck Message-ID: <20160428074846.a28da3113294f1edc6ed9ce6@aei.mpg.de> In-Reply-To: <20160427141436.GA60370@in-addr.com> References: <20160427152244.ff36ff74ae64c1f86fdc960a@aei.mpg.de> <20160427141436.GA60370@in-addr.com>
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On Wed, 27 Apr 2016 15:14:36 +0100 Gary Palmer <gpalmer@freebsd.org> wrote
about Re: zfs on nvme: gnop breaks pool, zfs gets stuck:
GP> vfs.zfs.min_auto_ashift
GP>
GP> which lets you manage the ashift on a new pool without having to try
GP> the gnop trick
I just tried this, and it appears to work fine:
---
root@storage:~ # sysctl vfs.zfs.min_auto_ashift
vfs.zfs.min_auto_ashift: 12
root@storage:~ # zpool status
pool: data
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
gpt/disk0 ONLINE 0 0 0
gpt/disk1 ONLINE 0 0 0
gpt/disk2 ONLINE 0 0 0
gpt/disk3 ONLINE 0 0 0
gpt/disk4 ONLINE 0 0 0
gpt/disk5 ONLINE 0 0 0
gpt/disk6 ONLINE 0 0 0
gpt/disk7 ONLINE 0 0 0
gpt/disk8 ONLINE 0 0 0
gpt/disk9 ONLINE 0 0 0
gpt/disk10 ONLINE 0 0 0
gpt/disk11 ONLINE 0 0 0
errors: No known data errors
pool: flash
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
flash ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
gpt/flash0 ONLINE 0 0 0
gpt/flash1 ONLINE 0 0 0
gpt/flash2 ONLINE 0 0 0
errors: No known data errors
root@storage:~ # zdb | grep ashift
ashift: 12
ashift: 12
root@storage:~ # zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
data 65T 1.88M 65.0T - 0% 0% 1.00x ONLINE -
flash 1.39T 800K 1.39T - 0% 0% 1.00x ONLINE -
---
I still wonder why the gnop workaround went so terribly wrong. Anyway,
thanks again for pointing out this new sysctl to me!
And for the record: this is what I get with a simple linear write test:
---
root@storage:~ # dd if=/dev/zero of=/flash/Z bs=1024k count=10000
10000+0 records in
10000+0 records out
10485760000 bytes transferred in 3.912829 secs (2679840997 bytes/sec)
---
I guess I won't complain...
cu
Gerrit
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