Dell EqualLogic PS6610ES EqualLogic PS6610 Storage Arrays Hardware Owners Manu - Page 17

Array, Behavior, Drive, Fails, Identifying, Failed, Drives, Interpreting

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PS6610 Hardware Owner's Manual 2 Drive Maintenance Array Behavior When a Drive Fails The PS6610 firmware uses a copy-to-spare operation to replace failing drives. This operation can, in many cases, improve the performance of the drive replacement process by avoiding a full RAID rebuild, which provides better reliability. Note: If a drive fails, replace it. Do not reinstall it in the array. If a replacement drive is not available, keep the failed drive in the array until it can be replaced. If a Spare Drive Is Not Available If a spare drive is not available, the RAID set will become degraded and performance might be impaired. However, a RAID 6 set can survive two simultaneous drive failures. If a spare drive is not available and the failed drive is in a RAID set that is already degraded, data might be lost and must be recovered from a backup. Identifying Failed Drives A drive failure is indicated by: • An LED located on the drive. See Interpreting Drive LEDs on page 11. • An LED on the Enclosure Status Indicator. • A message in the event log or in the Group Manager Alarms panel. • Indications in the Group Manager group member Disks tab or the CLI member select show disks command output. Inside each drawer, a Drawer Slot Label located on top of the sideplanes shows the drive numbering within each row. See Disk-Drive Slot Numbers on page 10. Interpreting Drive LEDs The drive LED is shown in Figure 7. The drive LED states are described in Table 7. Figure 7: LEDs on Drive Enclosure 11

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PS6610
Hardware
Owner's
Manual
2
Drive
Maintenance
Array
Behavior
When
a
Drive
Fails
The
PS6610
firmware
uses
a
copy-to-spare
operation
to
replace
failing
drives.
This
operation
can,
in
many
cases,
improve
the
performance
of
the
drive
replacement
process
by
avoiding
a
full
RAID
rebuild,
which
provides
better
reliability.
Note:
If
a
drive
fails,
replace
it.
Do
not
reinstall
it
in
the
array.
If
a
replacement
drive
is
not
available,
keep
the
failed
drive
in
the
array
until
it
can
be
replaced.
If
a
Spare
Drive
Is
Not
Available
If
a
spare
drive
is
not
available,
the
RAID
set
will
become
degraded
and
performance
might
be
impaired.
However,
a
RAID
6
set
can
survive
two
simultaneous
drive
failures.
If
a
spare
drive
is
not
available
and
the
failed
drive
is
in
a
RAID
set
that
is
already
degraded,
data
might
be
lost
and
must
be
recovered
from
a
backup.
Identifying
Failed
Drives
A
drive
failure
is
indicated
by:
•
An
LED
located
on
the
drive.
See
Interpreting
Drive
LEDs
on
page
11
.
•
An
LED
on
the
Enclosure
Status
Indicator.
•
A
message
in
the
event
log
or
in
the
Group
Manager
Alarms
panel.
•
Indications
in
the
Group
Manager
group
member
Disks
tab
or
the
CLI
member
select
show
disks
command
output.
Inside
each
drawer,
a
Drawer
Slot
Label
located
on
top
of
the
sideplanes
shows
the
drive
numbering
within
each
row.
See
Disk-Drive
Slot
Numbers
on
page
10
.
Interpreting
Drive
LEDs
The
drive
LED
is
shown
in
Figure
7
.
The
drive
LED
states
are
described
in
Table
7
.
Figure
7:
LEDs
on
Drive
Enclosure
11