Consider two rather equal servers, both with equal disks (2TB
rotational drives); one server have a ZFS mirror (two disk), the other
have a ZFS RAIDZ1, with 3 disks.
Both server are unload, we are moving data in, via single
Gigabit connection.
Moving data into the ZFS mirror lead to a impressive 120 Mbyte/s
writing speed, with little or no iodelay (1-2 %).
Moving data into ZRAID1 lead to an 60-70 Mbyte/s writing speed, no
more, and a decent iodelay on the system (8-10 %).
Both seems to me configured equally (eg, for example, no compression).
I've read:
https://pve.proxmox.com/wiki/ZFS_on_Linux#sysadmin_zfs_raid_considerations
but really i'm got a bit lost... there's somewhere a more clear
explanation of the 'effect', and i hope some parameters to tackle with?
Thanks.
PS: it is not a problem 'per se', the RAIDZ1 pool could be 'slow', but
i've the doubt to have done somthing wrong...
--
dott. Marco Gaiarin GNUPG Key ID: 240A3D66
Associazione ``La Nostra Famiglia'' http://www.lanostrafamiglia.it/
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marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 f +39-0434-842797
Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
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