Date: Thu, 28 Jan 2021 13:09:17 +0000 From: Matt Churchyard <matt.churchyard@userve.net> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS issues on 13-current snapshot Message-ID: <90b46fa559f34d5986d25e98878926c7@SERVER.ad.usd-group.com>
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Hello Just a follow up on my email yesterday about ZFS issues on a 13-current sna= pshot. I have now scrapped the 13 system, reinstalled 12.2 on a new pool, and copi= ed the same ~400GB of data to it. This is the outcome - 1) I no longer see phantom data in snapshots that have been sent to the poo= l. Every snapshot lists 0 usage. "zfs diff" is also much happier and runs i= n seconds on any dataset. 2) I can scrub the entire pool in 30 minutes with the disks pushing 150MBps= + pretty much the entire time. I eventually cancelled the scrub on 13; It s= tayed at 19% for about 4 hours, then made some progress to about 65%, befor= e sitting there for another 6 hours. I gave up in the end and stopped it. # zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALT= H ALTROOT offsite 14.5T 906G 13.6T - - 0% 6% 1.00x ONLIN= E - # zpool status pool: offsite state: ONLINE scan: scrub repaired 0 in 0 days 00:27:46 with 0 errors on Thu Jan 28 13:= 44:47 2021 3) Additional minor thing unrelated to ZFS or storage, but I noticed that '= systat -ifstat 1' was showing 23MB/s throughput which let me to believe I m= ust have been running at a gigabit and just getting slow throughput for oth= er reasons. I probably should have looked into this more considering the se= nder showed 11MB/s. On 12.2, I see 11MB/s on both ends, making it very clea= r it was definitely capping at 100Mbps. I eventually tracked down a 100Mbps= link - obviously not a FreeBSD issue, but it seems systat was reporting do= uble on 13. Maybe some of these are due to it being a current dev snapshot and having v= arious debug features active, but I think I will be seeing the general resp= onse when 13 comes out before I go anywhere near it... Regards, Matt Churchyard
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