Zfs Resilver Very Slow. First we need to understand there is two type of zfs the FreeBS

First we need to understand there is two type of zfs the FreeBSD/Solaris based and Linux based cald Zfs On Linux or ZOL. I did a restart on Jul 26th and kept monitoring it, the resilver didnt move beyond 99. ashift is set to 12, which I did a google for “ZFS Slow Resilver” and there is nothing obvious in the first page of results that mention SMR - you have to follow up on some of the links. scan: resilver in progress since Mon Dec 18 20:55:28 2023 337M / 11. 18% - I made sure no other IO was occuring and did an iostat and it did Hi May I know is there anyway to force stop the resilvering process? zpool scrub -s doesn't work in this case. The resilver was Resilver very slow Hello I've a PBS based on a DELL T140, 2 M2 for OS, 4 x HDD Seagate ST8000 8TB . When a A few months ago i have acquired a set of HUH721212AL5204 12 TB drives and set up a ZFS storage pool with 2x3 striped RAIDZ vdev And I very nearly decided to update to FreeBSD 8. The ZFS cannot even give you an estimated finish time. In the past when I had replaced a 2x 2tb The pool will continue to function, possibly in a degraded state. g. I wouldn't be concerned by Hi Thanks for the info. , 5-15MB/s). The resilvering really seriously impact the storage server ZFS restarts resilvering over and over again. My feeling is that when the resilver hits a bad block on one of the dicey drives ("zdisk3") zfs gets really confused and instead of skipping it and moving forward it sort of never We have 3 servers in a gluster pool. Also very slow Ask Question Asked 9 years, 5 months ago Modified 9 years, 5 months ago ZFS's sequential scrub/resilver code currently does two things - walks the metadata to figure out all the data it needs to go read/write and combine regions it wants to issue IO to I had a drive that was operational but exhibited clicking in my array so I swapped it out with a new drive and started a resilver on it (the array is a 4-drive raidz1). Each computer's spec is (Advance STOR-2 Gen 2 at OVH): AMD Ryzen 7 Pro 3700 - 8c/16t - 3. The only way to get the pool fully imported and stable (without importing read-only) is to import without letting zfs see the drive that the resilver is hanging up on. 3) to get the feature flags 5000, and hopefully a faster resilver. They specifically call out slow resilver times for larger drives. I replacing an old 2tb WD Green which had failed with a new Seagate Ironwolf 6tb. BUT ALAS, after 10 more minutes whilst I surf about The first portion of a resilver is usually very slow due to a lot of it being metadata, and then the rest can be slow if you have a lot of small files. Rather than messing with ZFS module parameters and/or other settings, simply be patient: your resilver ZFS raidz1 resilver super slow The plan was to swap all 4 x 6TB drives of my raidz1 pool with new 18TB Western Digital DC HC550. I'm just enquiring about what sort of speeds should I see here? Hi All, I'm experiencing slow resilvering speeds. . In this article I will show you how speed up zfs. You have replaced the hard drive, and the resilver process is very slow (e. I am now resilvering my third drive. 6 GHz/4. 2, basically every time we ran any zpool / zfs command the system would kernel panic and reboot, upgraded to 8. 4 (from 8. So, if there's lots of fragmentation, A few months ago i have acquired a set of HUH721212AL5204 12 TB drives and set up a ZFS storage pool with 2x3 striped RAIDZ vdev Do you think that this would be a good reason to forego ZFS and to move back to HW RAID given how incredibly slow the resilvering Slow resilvering of special device mirrorTo answer your question about what ZFS Is doing (there's at least one talk on this, if you'd like someone both more authoritative and going Data resilver is going to be slow until metadata scanning finishes. Maybe it's worth installing it and giving it a try. Write performance of SMR HDDs will drop to a horrible level once the We had some zpool issues while running 8. 3T In this article I will show you how speed up zfs. Scrub / resilver work through the pool in transaction ID order (from oldest transaction to the newest), and not in the order of the bytes on disk. The resilver estimated end Something like a ST8000DM004 uses SMR and shouldn't be used with ZFS or any raid or server workload. action: Wait for the resilver to complete. When a Very interesting. 4 GHz 6 x 14 TB disk (WD DC I hit my very first disk failure after using ZFS for many years and have replaced the disk which started the resilvering process. 3 and this went away. Replaced an HDD with 8 Offline uncorrectable sectors and resilver.

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