We need to load and process large amount of data (hundreds of GB) in a very short time. The normal sync won't have to be the entire drive, only changed blocks, since LVM knows which blocks are dirty.Ī little bit of orchestration around quiescing the DB before you break the mirror, and keeping the right set of WAL logs around to allow recovery should do it. Once the NVME drive is synced up, you break the mirror in the other direction and now operate off NVME again.Tell raid/LVM to sync up the NVME drive.This gets you back online very quickly but with degraded performance. On failure, you reinit the mirror based on the EBS copy and replay the relevant WAL logs.Perform periodic backups by telling raid to sync up the EBS-half of the mirror that is usually detached.Have postgres send WAL logs to a EBS, potentially PIOPS, volume.Use LVM or mdadm in a mirror setup, most of the time the mirror is 'broken' ie nvme-only.> Once everything is build it's OK to work on EBS while we re-sync to the instance storage. Is it possible to get any guarantee from AWS about persisting instance store? we don't mind paying.It will slow us down, but at least we can keep working. Replication to Postgresql server on another instance using EBS.RAID-0 (between the NVMe and EBS), but it seems to lock us to the slowest of the two storage mediums (i.e.The volume is ~1TB, meaning that copying it from EBS (at 125MB/s) will take over 2 hours. Once everything is build it's OK to work on EBS while we re-sync to the instance storage. We want to mirror it to a persistent storage so in such case we don't have to re-build everything. We are afraid that the ephemeral nature on instance storage can kill it any moment (if AWS decides to kill the instance for whatever reason). We use instance NVMe storage for I/O intensive operations (Postgresql with lots of data to process in very short time). If you're posting a technical query, please include the following details, so that we can help you more efficiently:ĭoes this sidebar need an addition or correction? Tell us here public IP addresses or hostnames, account numbers, email addresses) before posting! ✻ Smokey says: recycle All The Things to fight climate change! Note: ensure to redact or obfuscate all confidential or identifying information (eg. Can't see where this 30 GB EBS is coming from or why its mounted on /.News, articles and tools covering Amazon Web Services (AWS), including S3, EC2, SQS, RDS, DynamoDB, IAM, CloudFormation, AWS-CDK, Route 53, CloudFront, Lambda, VPC, Cloudwatch, Glacier and more. Not sure what is going on here, this is a vanilla provision with Terraform, perhaps I just need to mount the 69 GB disk. Running lsblk does show something ~]$ lsblk Partition table entries are not in disk order. Sector size (logical/physical): 512 bytes / 512 bytes Running fdisk shows the same ~]$ sudo fdisk -l /dev/nvme0n1ĭisk /dev/nvme0n1: 30 GiB, 32212254720 bytes, 62914560 sectors Why am I not getting the 75 GB advertised I also see in the AWS console 10 Elastic Block volumes of 30 GB. ~]# df -hįilesystem Size Used Avail Use% Mounted on The advertised space is "1 x 75 NVMe SSD", however when I ssh on to the instance I see. I recently provisioned 10 m5d.large instances (with Terrafor.
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