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How long do HA initial synchronization, failover, and switchover take?

Hvor lang tid tager HA initial synkronisering, Failover, og skift?

Last modified date: 2025-06-24

Applicable Products

QuTS hero h5.3.0 or later
High Availability Manager

Background

High availability (HA) allows two QNAP NAS devices to form an active-passive setup for uninterrupted service. The active node provides services while the passive node continuously syncs data from the active node, ready to take over any time. This transition is called a failover if triggered by a failure, and a switchover if triggered by non-failure events.

When synchronizing data during HA cluster creation, the system needs to replicate a large amount of data from one node to the other. For failovers or switchovers, the system needs to ensure seamless continuation of applications and services. The time required for these operations can vary significantly depending on hardware specifications, storage configuration, and network conditions.

Details

The actual time required for initial synchronization and for a failover or switchover depends on the following factors:

Data volume: Larger amounts of data increases synchronization time.
Storage performance: HDDs are slower than SSDs. RAID configuration also affects performance.
Network conditions: The heartbeat connection speed affects how fast data is transferred (we recommend using ports and a direct cable connection of 10 GbE or faster).
System load: Ongoing services and background tasks may consume resources and slow down the process time.
Applications and services: It takes time to shut down and restart each application and service, especially in an environment with iSCSI LUNs.

Typical Time Ranges (Reference Only)

Process	Typical Time Range
Initial synchronization	Tens of minutes to several hours
Failover/switchover	Around 30 seconds to several minutes
Failover/switchover with multiple iSCSI LUNs	Several minutes to tens of minutes The more iSCSI LUNs there are, the longer it takes.

Note

The actual time required depends on your environment and system configuration. We recommend performing switchover tests during non-production hours to evaluate performance in your specific setup.

Gældende Produkter

QuTS hero h5.3.0 or later
High Availability Manager

Baggrund

Høj tilgængelighed (HA) giver mulighed for, at to QNAP NAS-enheder kan danne en aktiv-passiv opsætning for uafbrudt service. Den aktive node leverer tjenester, mens den passive node kontinuerligt synkroniserer data fra den aktive node, klar til at overtage når som helst. Denne overgang kaldes en Failover, hvis den udløses af en fejl, og en switchover, hvis den udløses af ikke-fejl hændelser.

Når der synkroniseres data under oprettelse af HA Klynge, skal systemet replikere en stor mængde data fra en node til den anden. For Failover eller switchovers skal systemet sikre en problemfri fortsættelse af applikationer og tjenester. Den tid, der kræves til disse operationer, kan variere betydeligt afhængigt af hardware specifikationer, Lager konfiguration og netværksforhold.

Detaljer

Den faktiske tid, der kræves til initial synkronisering og for en Failover eller switchover, afhænger af følgende faktorer:

Datamængde:Større datamængder øger synkroniseringstiden.
Lager ydeevne:HDD'er er langsommere end SSD'er. RAID-konfiguration påvirker også ydeevnen.
Netværksforhold:Hastigheden på heartbeat-forbindelsen påvirker, hvor hurtigt data overføres (vi anbefaler at bruge porte og en direkte kabeltilslutning på 10 GbE eller hurtigere).
Systembelastning:Løbende tjenester og baggrundsopgaver kan forbruge ressourcer og sænke procestiden.
Applikationer og tjenester:Det tager tid at lukke og genstarte hver applikation og tjeneste, især i et miljø med iSCSI LUN'er.

Typiske Tidsintervaller (Kun Reference)

Proces	Typisk Tidsinterval
Initial synkronisering	Titusinder af minutter til flere timer
Failover/switchover	Omkring 30 sekunder til flere minutter
Failover/switchover med flere iSCSI LUN'er	Flere minutter til titusinder af minutter Jo flere iSCSI LUN'er der er, jo længere tid tager det.

Bemærk

Den faktiske tid, der kræves, afhænger af dit miljø og systemkonfiguration. Vi anbefaler at udføre switchover-tests uden for produktionstimer for at evaluere ydeevnen i din specifikke opsætning.

Yderligere Læsning

Hvordan kan jeg reducere initial synkroniseringstid for min HA Klynge?

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Overvågning

NAS

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Overvågning

Applicable Products

Background

Details

Typical Time Ranges (Reference Only)

Further Reading

Gældende Produkter

Baggrund

Detaljer

Typiske Tidsintervaller (Kun Reference)

Yderligere Læsning

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