zol

  1. L

    ZOL - recover lacked MBR after physical problem

    We had a physical problem in our backup server (we suppose an electrical shock due to the thunderstorm). The system is Linux Debian on a disk and the storage in on a two 4 TB disks RAID-1 ZFS (ZFS On Linux) pool. The first symptom we discovered was a frozen system. After we had multiple erratic...
  2. D

    Zpool on sparse files

    Hi everyone! I have an NFS share, where I'm planning to store my backups. I created a raidz2 zpool on 7 sparse files on that NFS share and transferred snapshots using syncoid to that zpool. It seems to me that it's a working solution, but I haven't done that before and wanted to hear your...
  3. D

    Optimize Write Amplification (ZoL, Proxmox)

    Hi, I've setup a Proxmox-Hypervisor and got a total write amplification of around 18 from VM to NAND flash. Can someone hint me how to improve this? Server setup: Supermicro X10SRM-F, Xeon E5-2620v4, 64GB DDR4 2133 ECC root drives: 2x Intel S3700 100GB (sda/sdb, LBA=4k) mirrored with mdraid...
  4. J

    Quotas with ZFS on Linux

    I built a storage device using ZFS on Linux for some of my users a few years ago. These are scientists/undergrads who are capable of generating a lot of data and they've been mostly responsible about it. Last weekend though, one of the new students in the lab managed to fill the filesystem by...
  5. W

    Disappointing ZFS read performance on 2 x 6 RaidZ2 and quest for bottleneck(s)

    Hi! After spending a lot of time reading valuable sources such as STH, I spent the last 3 months slowly incubating my new file server. I am unfortunately quite disappointed by the performance of the resulting system. I apologize for the long post, but I will try to give all relevant info that...
  6. C

    ZFS insufficient replicas on replaced disk

    Hi. I hope someone here can help me. Since 2015 I have z pool of 5 WD reds in raidz2 on Ubuntu server 16.04 and recently one of my drives started reporting checksum errors. After scrub error count went up and I decided to check if I should replace the drive. Smartctl said what SMART reports...
  7. _alex

    ZFS, possible to limit/control ARC size per pool ?

    Hello, i wonder if there is a way to have more fine grained control about ARC usage than limiting arc for the whole kernel module, and therefore all pools. Let's say i have three pools, one for the root-filesystem, the other for data and one for backup. I want the root-pool to consume a fairly...
  8. Patrick

    ZFS native on Ubuntu 16.04 LTS

    ZFS on Ubuntu was in tech preview mode for Ubuntu 15.10. In 16.04 LTS it is set to be installed by default. For those that have not seen it yet, here is a screenshot from the latest 16.04 LTS build I had on hand: With ZFS on Linux heading to being extremely easy to get installed (e.g. it is...