draid vs other implementations #11620
NicholasRush
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Ideas
Replies: 1 comment 4 replies
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IMHO draid main selling point is very fast rebuild times, when all disks
are busy rebuilding instead of conventional raid when rebuild speed is
limited by the write performance of the spare. Also all disks including
spares are in use during normal operation, when in the conventional raid -
spares are completely idle.
…On Sat, Feb 20, 2021 at 5:58 AM Alexander K. ***@***.***> wrote:
Hello everyone,
i use zfs for storing my data safe at work and at home. In the newest zfs
release you have announced the new draid feature. What i want to know is,
because several years before i came to zfs i used much more systems from
Netapp (FAS) and they use a Raid-4 implementation. I know that this type of
Raid would be very slow if writes are not cached to a nvram device and the
parity disk would limit the write througput. But you get another nice
features like expansion of the raid group, because all parity is stored on
one or like the curent implementation three drives. With a write cache ssd
this would be very nice to have. Or do I misunderstand how it works here?
But what makes draid better than raid-4, dp or tec?
Thanks in advance
NR
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Hello everyone,
i use zfs for storing my data safe at work and at home. In the newest zfs release you have announced the new draid feature. What i want to know is, because several years before i came to zfs i used much more systems from Netapp (FAS) and they use a Raid-4 implementation. I know that this type of Raid would be very slow if writes are not cached to a nvram device and the parity disk would limit the write througput. But you get another nice features like expansion of the raid group, because all parity is stored on one or like the current implementation three drives. With a write cache ssd this would be very nice to have. Or do I misunderstand how it works here? But what makes draid better than raid-4, dp or tec?
Thanks in advance
NR
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