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ZFS fragmentaion

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sb00nk
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ZFS fragmentaion

Post by sb00nk »

Hi all, i used to think there isn't a way to defrag my ZFS pool but today i notice this
Cattura.PNG
the frag field means the percentage of fragmentation on the pool? it can be defragged? if yes, how? :mrgreen:
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NASSERVER
firmware: 	11.1.0.4 - Atomics (revision 4528)
setup:		x64-embedded on 16GB microSD (Samsung MB-MP16D/EU)
case:		Cooler Master Silencio 550
mb:		ASROCK C2550D4I
cpu:		Intel Avoton C2550 @ 2.40GHz
ram:		32GB DDR3 ECC (4x Kingston KVR16E11/8)
hds:		4x2TB RaidZ (WD20EFRX)
cold spare:	1x WD20EFRX

BACKUP
NETGEAR ReadyNAS Duo
hds:		2x500GB Raid1 (WD5000AADS)
cold spare:	1x WD5000AADS
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slaycock
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Re: ZFS fragmentaion

Post by slaycock »

What evidence do you have that 'fragmentation' is causing you problems?
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JoseMR
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Re: ZFS fragmentaion

Post by JoseMR »

I haven't noticed any issue so far on my NAS fortunately, but my ZFS pools Frag looks worse than yours.
ZFS_FRAG.PNG
The sad part is that I recently redone my "storage" pool(shared storage) and restored from backups, and after adding data this past few months, frag reached 32%.

Even worse, the pool "system" was created few days ago(system data partition), and frag reached 5% in just few days, with only 2% of data. :?
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System: FreeBSD 12 RootOnZFS Mirror, MB: Supermicro X8SI6-F, Xeon X3450, 16GB DDR3 ECC RDIMMs.
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dnar
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Re: ZFS fragmentaion

Post by dnar »

Always going to happen on a copy on write fs. Does it cause issues on zfs? Not unless your capacity is near 80%.
NAS 1: NAS4Free 9.3.0.2 x64 embedded, Intel Core 2 E8400, 8GB, 6 x WD Green 1TB in RAIDZ2, Highpoint 2720 SAS x 8 card 6Gbps
NAS 2: NAS4Free 10.2.0.2 x64 embedded, Intel Core i3-3220, 8GB, 7 x WD Green 750GB in RAIDZ1, onboard SATA 3Gbps
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raulfg3
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Re: ZFS fragmentaion

Post by raulfg3 »

More info about ZFS Fragmentation:

http://blog.delphix.com/uday/2013/02/19/78/
12.1.0.4 - Ingva (revision 7743) on SUPERMICRO X8SIL-F 8GB of ECC RAM, 11x3TB disk in 1 vdev = Vpool = 32TB Raw size , so 29TB usable size (I Have other NAS as Backup)

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sb00nk
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Re: ZFS fragmentaion

Post by sb00nk »

thanks to you all for your replies but i'm not experiencing any problem. My primary question was "there is a way to defrag my pool?"

Code: Select all

NASSERVER
firmware: 	11.1.0.4 - Atomics (revision 4528)
setup:		x64-embedded on 16GB microSD (Samsung MB-MP16D/EU)
case:		Cooler Master Silencio 550
mb:		ASROCK C2550D4I
cpu:		Intel Avoton C2550 @ 2.40GHz
ram:		32GB DDR3 ECC (4x Kingston KVR16E11/8)
hds:		4x2TB RaidZ (WD20EFRX)
cold spare:	1x WD20EFRX

BACKUP
NETGEAR ReadyNAS Duo
hds:		2x500GB Raid1 (WD5000AADS)
cold spare:	1x WD5000AADS
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