Adaptec GDTSETUP Uživatelský manuál stáhnout pdf (Strana 167)

167

The Retries/Reassigns counters have a particular meaning:

(1) The Retries counter is incremented by one unit whenever the ICP Controller retries to

access a hard disk. If this counter continues to increase (possibly on other hard disks, too)

it is very likely that the cable is not good enough for the selected data transfer rate (cable

too long, poor quality of cable and connectors), or that the SCSI bus is not properly termi-

nated (too many terminators on the cable, or missing terminator). In very few cases is the

hard disk concerned defective. The retry counter also increases when the SCSI parameters

of a hard disk are changed (see further ahead). Obviously, retries due to this do not imply

bad cabling.

(2) The reassign counter reflects the number of media defects which occur on the hard disk

drive. Defective blocks of the hard disk are assigned substitute blocks (spare blocks) which

are either on the same track, or on alternate ones if all spare blocks on the same track are

already in use. The administration of the reassignments is carried out by the hard disk

through according reassignment tables. Note: If a hard disk works with alternate tracks, it

is generally no longer suitable for applications with high performance expectations. When-

ever a defective block is being accessed, the read/write actuator has to move to an alternate

position and this requires extra time.

If you observe that the number of reassigns is constantly increasing, you may suspect that

something is wrong with this drive.

With the m and o keys, you can change the scale of the graphical KB/s indication.

With the n and p keys, you can scroll the screen to see more hard disks (if available).

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This menu option gives information on the utilization of the GDT cache. For RAID 4/5 Host

Drives, the data cache and parity cache are displayed separately.

Note: The GDT firmware only allocates cache RAM to the GDT parity cache if RAID4/5 Host

Drives have been set up.

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Adaptec GDTSETUP Uživatelský manuál Strana 167