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facebookarchive
flashcache
C2010–2022
facebookarchive / flashcache · Archived

flashcache

A general purpose, write-back block cache for Linux.

Systems & Infrastructure
Explore on GitHubRead Hacker News discussions
12Distinct people
12Mentions
0Explicit recommenders
1.6KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

A general purpose, write-back block cache for Linux.

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year12 dated mentions

Observed mentions: 2010-05-07 20:42:54 UTC to 2022-08-16 00:31:28 UTC.

012342010-01-01 00:00:00 UTC to 2011-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments20102011-01-01 00:00:00 UTC to 2012-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2012-01-01 00:00:00 UTC to 2013-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments2013-01-01 00:00:00 UTC to 2014-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2014-01-01 00:00:00 UTC to 2015-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2015-01-01 00:00:00 UTC to 2016-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2016-01-01 00:00:00 UTC to 2017-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20162017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2022

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20102010-01-01 00:00:00 UTC2011-01-01 00:00:00 UTC211
20112011-01-01 00:00:00 UTC2012-01-01 00:00:00 UTC101
20122012-01-01 00:00:00 UTC2013-01-01 00:00:00 UTC404
20132013-01-01 00:00:00 UTC2014-01-01 00:00:00 UTC303
20142014-01-01 00:00:00 UTC2015-01-01 00:00:00 UTC000
20152015-01-01 00:00:00 UTC2016-01-01 00:00:00 UTC000
20162016-01-01 00:00:00 UTC2017-01-01 00:00:00 UTC101
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC000
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC000
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC000
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC000
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC000
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC101

What Hacker News says

12 sources
cbsmith·Aug 16, 2022
There's a bunch of pretty simple, old products for using SSD's to provided caching for higher latency drives that are all about ~a decade old. Some of them even use Linux's device manager or the block device subsystem explicitly... https://github.com/mingzhao/dm-cache https://man7.org/linux/man-pages/man7/lvmcache.7.html https://www.kernel.org/doc/Documentation/bcache.txt https://github.com/facebookarchive/flashcache https://github.com/stec-inc/EnhanceIO Doing RAID-1 (or RAID-10) style solution certainly is reasonable, but I don't understand what's novel here. ...and IIRC this is the kind of thing that btrfs and zfs were managing explicitly...
In How Discord supercharges network disks for extreme low latency
wmf·May 29, 2010
You're way off the deep end here. An SSD would probably be faster and more reliable as a boot drive than your RAID-0. In fact, your RAID-0 is probably no faster than RAID-5 in most cases, but it's obviously more dangerous. For your backup needs, it sounds like continuous data protection is what you're looking for. There are two (announced) SSD cache drivers for Linux: http://github.com/facebook/flashcache and http://lkml.org/lkml/2010/4/30/496
In Ask HN: Using 5-drive RAID 0 array as another cache layer

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