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    Optimize Write Amplification (ZoL, Proxmox)

    Meanwhile I recreated every zvol because I changed the volblocksize of the raidz1 pool to 32K so I don't loose capacity because of bad padding. The write amplification of the SSDs themselve isn'T that bad. Its around factor 2.4x. A bigger problem is the write amplification between Guest-OS and...
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    Optimize Write Amplification (ZoL, Proxmox)

    I tested 4 SSDs as mirror striped zfs pool (like raid10) and the write amplification was even worse... raidz1 of 5 SSDs: 808 kb/s writes from VMs -> 6913 kb/s writes to pool = 8.56x write amplification (without additional write amplification from SSD) zfs mirror stripe of 4 SSDs(raid10) with...
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    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...