NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
Solved
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".
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".
ok i think i got want i was asking.
i stumbled across where to check how much i need lastnight its under 30gig
so 20 500gig drives are wayyyy over kill and i dont see to much if any real benefit giveing the librarian/card catalog of the file system faster drives at this point in time.. unless im missing something. i pull 100% full gig speeds over the network atm. so not sure where it could help
and just want to say thanks for the info sofar
craer87 wrote:
so 20 500gig drives are wayyyy over kill
I agree, a RAID-1 tier should be sufficient with single-redundancy, and RAID-6 for dual redundancy. I suspect the "should" in the flexraid guide is a suggestion.
craer87 wrote:
i dont see to much if any real benefit giveing the librarian/card catalog of the file system faster drives at this point in time.. unless im missing something. i pull 100% full gig speeds over the network atm. so not sure where it could help
It won't help with large file transfers. It definitely does help if you have folders with lots of small files (documents or photos), and it will increase the speed of searches. So it definitely depends on the data.
sry this took so long and thanks
i did meen 2 ssd drives not 20 sry
i do have a LOT of photos , movies on my Nas some aps and other stuff
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.
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?
also is anyone else using this or having any bugs with it
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.
NETGEAR Academy
Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology!
Join Us!
