Ingrasys nastorage 12600 series, Руководство пользователя

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Appendix A More about RAID Storage
1. Volume Expansion:
In addition to volumes made of striping, mirroring, RAID-Z1/Z2, several volumes can be
combined into a larger volume pool. The combinations can be:
1-1. ...: similar to traditional RAID10.
1-2. RAID-Z1 + RAID-Z1 + ...: similar to RAID50.
1-3. RAID-Z2 + RAID-Z2 +...: similar to RAID60.
2. Volume Characteristics:
The characteristics of different logical volumes can be summarized as follows:
Volume type Min. no. of disks Usable capacity Description
Stripe 1 1 One volume can consist of only
a single disk
Mirror 2 or more 1/N More than 1 disk can fail in a
mirrored volume. The max.
number of disk failures in a
mirrored volume is (N-1).
RAID-Z1 >=3 (N-1)/N The max. number of disk failure
without data loss is 1.
RAID-Z2 >=4 (N-2)/N The max. number of disk failure
without data loss is 2.
3. Volume Online Expansion
3-1. Online Expansion:
If there is any unpopulated disk tray, you can replace any of the disk member in a logical
volume. To do that, you can:
3-1-1. Insert a larger new drive in an unused disk bay. Replace an existing member drive
using with the new, larger drive.
3-1-2. The process can take hours depending on the size of the volume and the size of
the data stored on the volume.