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ssd tiering
ok so looking in to if i can add some speed to me NAS
i have 4) 10tb drives
thinking about putting some ssd's in the last 2 bays still leaving me room to grow
i have some 500g WD blue ssd both ...
There is is an explanation on page 10 here: https://www.downloads.netgear.com/files/GDC/READYNAS-100/ReadyNAS_FlexRAID_Optimization_Guide.pdf
Also here: https://kb.netgear.com/000049513/ReadyNAS-OS-6-9-Metadata-Tiering
One ambiguity is the statement "The number of SSDs for the SSD tier should be equal to the number of drives in the RAID group." I don't know if that is a suggestion or a requirement.
Note that per the guide, you need to create an SSD tier for each RAID group in the volume.
craer87 wrote:
exp: does it take a high use file off the hdds and "MOVE" it to the ssd or is it a copy
The SSD tier is not a cache. Things stored on it are not duplicated on the mechanical disks.
With 6.9.x firmware the tier only includes metadata, it does not include the actual files. Note that in 6.10.x beta Netgear is expanding the use of the tier to include some files (data). https://community.netgear.com/t5/ReadyNAS-Beta-Release/ReadyNASOS-6-10-0-T185-Beta-2/m-p/1651396#M10285
craer87 wrote:
and what MetaData . what exactly is that on the nas
"Metadata" is the on-disk structures used by the BTRFS file system to describe the files - among other things it includes the filenames, the organization of the files into folders and BTRFS subvolumes, file owners and permissions, and the location of the data in the files on the disks. The equivalent information in the ext filesystem is in "inodes".
hcraer87 wrote:
so correct me if i am wrong but im showing 14 gigs of metadata and thats with 60-70% of (3) 10TB drives installed used and plans to add 2-3 more.. so i plan on using some 240gig (2 of them ) in raid 1 for help speed up the seak times and thumbnail pic?
i do with it can use them as a cache drive.
You can do that, and when you update the firmware to 6.10 the system would also use them for frequently used data files.
craer87 wrote:
but what im reading is if i do this i cant ever!! remove this from the nas with out a fresh wipe and i cant upgrade the ssd or platter hard drives to a larger size?
I believe that tiering isn't something you can reverse. OOM-9 or kohdee, is that the case??? I also don't know if you can expand the tiering (though in principle that could be done).
But you should be able to upgrade the mechanical disk sizes.
The ability to reverse or expand the tiering would certainly be useful, so perhaps post a suggestion in the "idea exchange" here that requests that feature.
StephenB wrote:
I believe that tiering isn't something you can reverse. OOM-9 or kohdee, is that the case??? I also don't know if you can expand the tiering (though in principle that could be done).
A tier is just a special RAID group. You can incrementally expand a tier as long as your Tier is not a RAID 0, and you can also remove a tier.
When you are looking at your System > Volumes screen, select the RAID group Tier (the one that says SSD) and click the circle X underneath the dropdown box. It will restore you to pre-tier configuration. Right now, if you select more SSDs to add "another tier," it will say "add group" but we will probably change it to say tier.
kohdee wrote:
A tier is just a special RAID group. You can incrementally expand a tier as long as your Tier is not a RAID 0, and you can also remove a tier.Thx for the quick reply, I think many folks will find it helpful (especially if they want to give tiering a try).
YES Thank you to every one.
i know i will be doing a Dule 240gb ssd setup for my 10tb drives. But
one more this i was thinking about and just to save room on the main unit was can you use the readynas expansion chassis(EDA500-100NAS) to house the tier group and keep the local sata ports for the spinners?
other then that i think im veary happy with the responce and help. i will saw the readynas community is the best i have bin apart of thanks.
Oooo and i have wanted to know for a wile but what if any can i use the M.2 port for on the inside of my 528x i just dident want to plug anything in to it wile i was doing a deep cleen one day?
craer87 wrote:
one more this i was thinking about and just to save room on the main unit was can you use the readynas expansion chassis(EDA500-100NAS) to house the tier group and keep the local sata ports for the spinners?
I wouldn't, for two reasons.
First, I don't think it's a good idea to have one volume spanning two chassis. It's more fragile than keeping all the disks together.
Second, SATA port multipler in the EDS500 is a performance bottleneck, and that would reduce and perhaps even eliminate the performance benefit.
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