Does anyone ever Mirrored Raid Between a RAMDisk and a Physical Disk?

Has anyone ever done a mirrored raid between a ramdisk and a physical disc, with the ramdisk being created at boot and the raid replicated every startup?

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Desktops 7 Answers 976 views 0

Answers ( 7 )

  1. Fred Spencer

    You mean like… Hibernation? Or a RAMDisk that forgets its changes every reboot? Or an OS that only writes changes to ram, not the disk? Or like a RAMDisk that’s populated with a specific set of files on startup?

    If so to any of the above, yes. If no, then I’m even less sure what you are asking.

    Can you explain it in a use case?

    • Gust Hand

      You have a RAMDisk, that is mirrored against a physical disk in a raid. At startup, the raid replicates the physical disk onto the RAMDisk (for faux persistence). You could put whatever you want on it for faster access via the main memory that it is stored on versus a tertiary storage on Sata or something.

  2. Jean Erdman

    Seems like the regular disk would be the bottleneck and you wouldn’t gain anything. Also restoring to the RAMDisk would take time as it reads from the regular disk.

    • Gust Hand

      Of course, it would take time to load, this was just a hypothetical I was thinking about.

  3. Israel Durgan

    You’re probably better off building something with a high-speed SSD for cache.

  4. Patrick Hermann

    If you want to play with storage first decide on a budget and then double it.

    I am on my third generation of storage since 2008. Build it right and you can play with things like vSphere and other cool enterprise toys.

    Gen 1 2008 – $500 – Linux crapbox running software raid. 4 500 GB drives.

    Gen 2 – 2010 – 2013 $1000 – Dell powered with 8 1tb drives. First I ran with the perc 5i and later I switched to FreeNAS ZFS.

    Gen 3 – 2013 – Current – $2500 – FreeNAS – 32 GB Xeon ( of 2013 era) 12 4TB drives run a stripe of RaidZ2. 2 64igig SSDs for a write cache, and a 256GB read cache. iSCSI 4 1 gigs port, 4×1 gig LAGG for NFS and other protocols.

    Gen 4 – building now – $2000 – a Synology or something similar to use as a backup for the gen3 system.

    Gen 5 – 2020ish – Replace Gen3 system – $3000

    • Gust Hand

      It was just a curiosity thing and not something I’m actually doing… Have had the opportunity to play with lots of enterprise toys in the past.

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