Ricoh MP7400A Bedienungsanleitung PDF herunterladen (Seite 7)

Should the hard disk drives be connected onto the same IDE channel while creating a RAID device?

No, you can group any hard disk drives (No Init) that are available on the IDE channels of the SURETE. In order to gain better

performance for RAID device, we will suggest to group hard disk drives located in the different IDE channels. For example, you

have 6 hard disk drives connected to the SURETE and you want to create two RAID level 5 devices. RAID group A should consist

of HD1, HD3, HD5 (all drives connected as "master" devices), and RAID group B should consist of HD2, HD4, HD6 (all drives

connected as "slave" devices).

Can a "3-drive RAID-5" be dynamically be expanded to "4-drive RAID-5" without losing the existing data?

Yes. SURETE provides a big and powerful function ¡§Hot Expansion¡¨ now; you can set one hard drive in ¡§Expand¡¨ web page for

expand capacity of RAID group. It means that the data stored in the old RAID device will not be lost when you want to increase

capacity of storage at no downtime. Dynamically changing the configuration of the RAID device is practicable in SURETE.

Will the data stored in the non-RAID drive be lost when I include this drive into a new created RAID device?

Before a non-RAID drive being included into a RAID device, it has to be deleted as "No Init" state. It means that it will be

formatted before being selected into this RAID device; the data stored in this drive will be lost.

When trying to build a RAID group in SURETE, why I do not see any available hard disk drive in the "Config RAID"

page?

To avoid the user would accidentally include in-use hard disk drives into a RAID device, only the "No Init" (or so-called "Un-used

Disks") hard disk drive(s) will be shown in this page for selection. Before you can create a RAID device, these candidate drives

have to be deleted as to the "No Init".

How about the performance difference will be observed between non-RAID and RAID device?

It is difficult to measure precisely because it depends on several factors like "amount of memory installed", "amount of drives

being included in the RAID device", ¡Ketc. General speaking, the grades of performance should be classified "RAID level 0" > non-

RAID > "RAID level 1" > "RAID level 5". And we believe the performance should not be the major consideration to decide whether

you should create a RAID device or not; it should depend on your real-world application. According to our in-house test result, the

performance difference among RAID level 0, non-RAID, and RAID level 1 should be within 5 ~ 10%. But for RAID level 5, the

performance drop will be around 15 ~ 25% compared with non-RAID device. That is because RAID 5 service will consume more

physical memory and CPU power for calculation.

Should more memory be installed onto SURETE when RAID groups are used?

For create RAID group in SURETE, we suggest you install at least 128MB add-on memory into the SURETE for the operation of

RAID group.

Can I adjust the "strip size" in the RAID 0 or 5 groups of SURETE?

No, the RAID feature of the SURETE does not provide a parameter to adjust the strip size.

Is "Hot Swap" function supported by SURETE?

Yes, SURETE cooperates with Ingrasys-approved mobile racks to provide the hot-swap and other related function for all hard

drives.

Is "Hot Spare" function supported by SURETE?

Yes, you can configure any "Unused Disks" drive as a "Hot-Spare Disks".

Can you explain "global Hot Spare" briefly?

SURETE uses the hot-spare disk(s) to recover a RAID group automatically and immediately when a RAID group is degraded with a

bad disk. It ensures data protection and availability. The hot-spare disks in SURETE are global because they are not associated

with any specific RAID group. Any RAID group in SURETE being degraded, a hot-spare disk will be consumed immediately to

1 2 3 4 5 6 7 8 9 10 11 12 ... 26 27

Keine Kommentare

Ricoh MP7400A Bedienungsanleitung Seite 7