Questions tagged [lvmcache]

A new technique which in theory take your existing logical volumes and convert them to be cached devices.

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A Question about LVM volume and storage management

Hi, I have 2 block devices: a 256G SSD and an 1TB HDD. I want to do: *Use the SSD storage for actively accessed and speed demanding files/directories such as runtime files, main system resources; and ...
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Best cache solution for random-read performance with SSD + HDD (RAID0)

For a project we do need more IO performance with 7200 RPM HDDs. I have checked the bcache and dm-cache and flashcache topics for this case, Currently setup: 2x3TB 7200 RPM in RAID 0 (HWR) 1x1TB SSD ...
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1answer
629 views

Ubuntu 18.04 won't boot when LVM volumes are cached

I have an Ubuntu 18.04 PC with the following disk layout : ====================== lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 931,5G 0 disk └─...
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slow startup, failed to connect to lvmetad

Ubuntu 18.04 after install seems to be doing quite OK, but the startup is slow. It's almost minute to get to "cryptluks screen", to enter pass to decrypt lvm partition. I noticed unknown error to me, ...
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1k views

How to setup lvm to cache /root on 18.04?

I have two drives and can use lvmcache to cache the hard drive with the SSD with 16.04. However, when I follow the same process with 18.04, I can create the lvmcache but when I reboot, I get the ...
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2k views

How to add an SSD cache to an encrypted HDD for desktop/GUI use?

SSHDs seem to be stuck at 4TB and 8GB SSD cache (one model is available with 1TB/32GB) while bigger SSDs are widely available and some solutions exist to to pair an HDD with an SSD in Linux. I'm ...
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2answers
3k views

lvmcache failed to boot: “device-mapper: cache-policy: unknown policy type”

TL;TR Failed to boot with lvm2's new default cache-pool setting cache-policy-smq The problem I have created a lvm disk with lvmcache on SSD drive on ubuntu 16.04 Following this, but failed to mount ...
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How to install Ubuntu with both disk encryption AND SSD caching

I'm using Ubuntu in a corporate environment, and our security policy states that we have to use full disk encryption. I've also got a laptop with a 32GB mSATA SSD and 750GB of spinning rust. My ...