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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 new unused and matching for the job
but what gains can i look forin dooing this.
im told once i do it i cant goback. and what MetaData . what exactly is that on the nas
and my other question is how does the Nas store the data?
exp: does it take a high use file off the hdds and "MOVE" it to the ssd or is it a copy
is any one having any realy pros or cons doing this ?
Thanks..
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".
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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.
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