[clug] Linux LVM or cache solutions for SSD + HDD
sjenkin at canb.auug.org.au
Thu Jan 24 18:10:06 MST 2013
A friend recently sent me a link about Apple "Fusion Drive".
- it's an LVM type (CS: Core Storage)
- concatenates, RAID-0 style, SSD & HDD drives
- places O/S files in SSD [not sure how it keeps them there]
- writes all files initially go to SSD
- can trigger a migration to SSD by 2 reads (copy file twice), IIRC.
[fuzzy on detail, how it triggers: reads or writes?]
- seems to work with 128Kb blocks
- maintains a 4GB 'free space' on SSD
- Doesn't seem to need FileSystem hooks
Only available on Mac Mini and iMac models, not Macbook.
MSY have reasonable PC 'packages' below $1000, with extra $200 for a
Samsung 840-series 250GB SSD. I'm tempted :-)
What do Linux people use to lash SSD/HDD together?
- manual allocation + symlinks, incl nightly scripts
- overlay mounts of important dirs
- something automatic that relocates stuff
(how to check HDD 'use'. atime?)
- bcache (?IIRC) or other SSD caching tool
- an LVM or 'md' config
- something a whole lot cooler??
Thanks in Advance.
Steve Jenkin, Info Tech, Systems and Design Specialist.
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA
sjenkin at canb.auug.org.au http://members.tip.net.au/~sjenkin
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