ZFS

Creating a 4 drive ZFS zpool: stripe over mirrors

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In this post, I am creating a 4 drive ZFS pool consisting of two mirror. In this post: I’m booting from mfsBSD 12.1 ZFS Creating partitions On FreeBSD, it is convention to create partitions. It is not necessary, but I don’t use all the space in case a future replacement drive is slightly smaller than these drives. NOTE: I am not, but have not confirmed that this is no longer a problem in […]

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Changing from one dataset to another within a FreeBSD [iocage] jail

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ZFS has a the ability to share itself within a jail. That gives the jail some autonomy, and I like that. I’ve written briefly about that, specifically for iocage. More recently, I started using a zfs snapshot for caching clearing. The purpose of this post is to document the existing configuration of the production FreshPorts webserver and outline the plan on how to modify it for more zfs-snapshot-based cache clearing. The current configuration

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Renaming and replacing zroot filesystems using mfsBSD

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I am replacing one zroot with another because of missing binaries and suspect layout. The existing zroot is an old system predating current zroot layouts. This work is being performed on a test system (that link is not safe for young eyes). In this post: FreeBSD 12.1 mfsBSD 12.1 The failed attempt I tried once, and failed, with with old zroot_old and new zroot_new mounted. zroot_new became unusable and I started again. This

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ZFS: adding a drive back into the zpool

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Today I was updating some servers. One of them was rebooted three times. On the third time, one of the drives went missing. This is how I tracked down which drive, and which slot in the server, and fixed it. I’m writing it mostly so I can remember how to flash the light on the drive. There is also an off-by-one issue to avoid. In this post: FreeBSD 12.1 sesutil ZFS Supermicro 846

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using zfs rollback for cache clearing

2 Comments / iocage, Jails, ZFS / By /

I’m in the final stages of the FreshPorts packages project. One of the last tasks is clearing the packages cache from disk when new package information is loaded into the database. See also: Clearing the packages cache ZFS when you’re not doing ZFS Several of the configuration items have been learned from putting my poudriere instance into a jail. In this post: FreeBSD 12.1 py37-iocage-1.2_5 If I was to do this cache clearing

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bectl details

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This is just a placeholder for me to find this later. I was cleaning up some old snapshots. I’m not sure I should have removed those snapshots and I’m saving this here for next time I use bectl. [dan@slocum:~] $ grep -v autosnap ~/tmp/snapshots/snapshots zroot/bootenv/default@2020-01-11-18:16:51 zroot/bootenv/default/tmp@2020-01-11-18:16:51 zroot/bootenv/default/usr@2020-01-11-18:16:51 zroot/bootenv/default/usr/local@2020-01-11-18:16:51 zroot/bootenv/default/usr/obj@2020-01-11-18:16:51 zroot/bootenv/default/usr/src@2020-01-11-18:16:51 zroot/bootenv/default/var@2020-01-11-18:16:51 zroot/bootenv/default/var/audit@2020-01-11-18:16:51 zroot/bootenv/default/var/empty@2020-01-11-18:16:51 zroot/bootenv/default/var/log@2020-01-11-18:16:51 zroot/bootenv/default/var/tmp@2020-01-11-18:16:51 [dan@slocum:~] $ sudo zfs destroy zroot/bootenv/default/var/tmp@2020-01-11-18:16:51 [dan@slocum:~] $ sudo zfs destroy zroot/bootenv/default/var/log@2020-01-11-18:16:51 [dan@slocum:~] $ sudo zfs destroy zroot/bootenv/default/var/empty@2020-01-11-18:16:51

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knew

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This post has been replaced by a newer post. For future reference, this is the knew server … oh wait, I think it’s this server which is was mounted in the 4U chassis mentioned in this post. It runs a few jails, including Bacula regression testing services. It is now mounted in a SuperChassis 846E16-R1200B This is the previous post for this system configuration. Photos of the assembly. File systems Paritions zpools Those

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zpool degraded – one drive missing from system

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I rebooted knew yesterday for upgrades. When it came back, the main storage zpool was degraded: Is the drive alive? The drive is not listed at all in /var/run/dmesg.boot. I keep a list of the expected drives in /etc/periodic.conf, for use by a Nagios check: [dan@knew:~] $ /usr/sbin/sysrc -nf /etc/periodic.conf daily_status_smart_devices /dev/da22 /dev/da21 /dev/da20 /dev/da19 /dev/da18 /dev/da17 /dev/da16 /dev/da15 /dev/da14 /dev/da13 /dev/da12 /dev/da11 /dev/da10 /dev/da9 /dev/da8 /dev/da7 /dev/da6 /dev/da5 /dev/da4 /dev/da3 /dev/da2 /dev/da1

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Creating a drive-bay map

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When the time comes to replace a drive, it is very nice to know which drives is missing. I created this drive map to help me figure out which drive disappeared. I created this drive-bay map using a combination of: zpool status sesutil map lsblk camcontrol /var/run/dmesg.boot I have not included /var/run/dmesg.boot here. If you click on this image, you’ll see a larger version which is easier to read. I went through sesutil

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zfstools & sanoid – snapshots on the local host

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I’m going to implement zfstools on all my ZFS-based hosts today. I first started using this tool in July 2019. In this post: FreeBSD 12.0 and 12.1 zfstools 0.3.6_1 sanoid-2.0.1_2 Local snapshots only I will be using zfstool only for creating local snapshots. If I wanted snapshots for sending to other hosts, I would probably use a tool such as sysutils/sanoid, which is policy-driven solution for snapshot management and replication. For now, there

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