Viewing Spare Chunklets - HP 3PAR StoreServ 7200 2-node Administrator's Manual

How spare chunklets work:
When a connection is lost to a physical disk or a physical disk fails, all future writes to the
disk are automatically written to a logging LD until the physical disk comes back online or
until the time limit for logging is reached. Logging disk space is allocated when the system is
set up.
If the time limit for logging is reached, or if the logging LD becomes full, relocation of chunklets
on the physical disk to other chunklets, whether free chunklets or allocated spares, starts
automatically. Free chunklets are chunklets that are not used by the system.
For automatic relocations, the system uses up a maximum of one disk worth of chunklets per
system node.
NOTE:
for the chunklet being relocated.
If the system uses up its free or spare chunklets for relocation, an alert is generated.
Once the spare and free chunklets are used up, automatic relocation no longer occurs. In
most cases, some data redundancy is lost. The system also generates an alert.

Viewing Spare Chunklets

Use the showspare command to display information about all spare chunklets. If a spare chunklet
is in use, the showspare output includes the name and ID of the LD using it, as well as the chunklet's
position on the LD. If the spare chunklet is not in use, it is listed as available, and the columns
relating to the LD show only dashes.
The following example displays information about two spare chunklets, 0 and 1, on physical disk
23:
%cli showspare
PdId Chnk LdName
23 0 ----
23 1 sales1.0
The fields in this output provide the following information:
PdId—The physical disk on which the chunklets reside.
Chnk—The position on the physical disk of the spare chunklets.
LdName—The name of the LD that is using the spare chunklet.
LdCh—The position of the chunklet on the LD.
State—The state of the chunklet as identified by the kernel. This value can be normal, none
(the chunklet has not been used by any LD), or failed.
Usage—Shows whether the spare chunklet is in use by an LD. Values can be:
◦
available—The chunklet is available for use as a spare.
◦
ld—The chunklet is in use by an LD.
◦
relsrc—Relocation source. The data has been moved to another chunklet.
◦
reltgt—Relocation target. The data in the chunklet has been moved from another spare
chunklet.
◦
abtrel—Abort relocation. The system cancels the chunklet relocation operation.
◦
cmprel—Completing relocation. The system is in the final phase of completing the
chunklet relocation.
108 Monitoring System and Physical Disk Capacity
Local chunklets are chunklets on disks, which are used by the node that owns the LD
LdCh State
--- normal
2 normal
Usage Media Sp Cl From
available valid Y
ld valid Y
To
Y --- ---
Y --- ---