Date: Wed, 22 Nov 2023 19:49:31 +1300 From: Jonathan Chen <jonc@chen.org.nz> To: freebsd-stable@freebsd.org Subject: Unusual ZFS behaviour Message-ID: <f8764549-773a-4695-b1fc-76e70e49de1b@chen.org.nz>
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Hi, I'm running a somewhat recent version of STABLE-13/amd64: stable/13-n256681-0b7939d725ba: Fri Nov 10 08:48:36 NZDT 2023, and I'm seeing some unusual behaviour with ZFS. To reproduce: 1. one big empty disk, GPT scheme, 1 freebsd-zfs partition. 2. create a zpool, eg: tank 3. create 2 sub-filesystems, eg: tank/one, tank/two 4. fill each sub-filesystem with large files until the pool is ~80% full. In my case I had 200 10Gb files in each. 5. in one session run 'md5 tank/one/*' 6. in another session run 'md5 tank/two/*' For most of my runs, one of the sessions against a sub-filesystem will be starved of I/O, while the other one is performant. Is anyone else seeing this? -- Jonathan Chen <jonc@chen.org.nz>
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