vxsparecheck(1M) VxVM 3.5 vxsparecheck(1M)
1 Jun 2002
NAME [Toc] [Back]
vxsparecheck - monitor VERITAS Volume Manager for failure events and
replace failed disks
SYNOPSIS [Toc] [Back]
/etc/vx/bin/vxsparecheck [mail-address...]
DESCRIPTION [Toc] [Back]
The vxsparecheck command monitors VERITAS Volume Manager (VxVM) by
analyzing the output of the vxnotify command, waiting for failures to
occur. It then sends mail via mailx to the logins specified on the
command line, or (by default) to root. It then replaces any failed
disks. After an attempt at replacement is complete, mail will be sent
indicating the status of each disk replacement.
The mail notification that is sent when a failure is detected follows
this format:
Failures have been detected by the VERITAS Volume Manager:
failed disks:
medianame
...
failed plexes:
plexname
...
failed subdisks:
subdiskname
...
failed volumes:
volumename
...
The Volume Manager will attempt to find hot-spare disks to replace any
failed disks and attempt to reconstruct any data in volumes that have
storage on the failed disk.
The medianame list specifies disks that appear to have completely
failed. The plexname list show plexes of mirrored volumes that have
been detached due to I/O failures experienced while attempting to do
I/O to subdisks they contain. The subdiskname list specifies subdisks
in RAID-5 volumes that have been detached due to I/O errors. The
volumename list shows non-RAID-5 volumes that have become unusable
because disks in all of their plexes have failed (and are listed in
the ``failed disks'' list) and shows those RAID-5 volumes that have
become unusable because of multiple failures.
If any volumes appear to have failed, the following paragraph will be
included in the mail:
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1 Jun 2002
The data in the failed volumes listed above is no longer
available. It will need to be restored from backup.
Replacement Procedure [Toc] [Back]
After mail has been sent, vxsparecheck finds a hot spare replacement
for any disks that appear to have failed (that is, those listed in the
medianame list). This involves finding an appropriate replacement for
those eligible hot spares in the same disk group as the failed disk. A
disk is eligible as a replacement if it is a valid VERITAS Volume
Manager disk (VM disk), has been marked as a hot-spare disk and
contains enough space to hold the data contained in all the subdisks
on the failed disk.
To determine which disk from among the eligible hot spares to use,
vxsparecheck first checks the file /etc/vx/sparelist (see Sparelist
File below). If this file does not exist or lists no eligible hot
spares for the failed disk, the disk that is ``closest'' to the failed
disk is chosen. The value of ``closeness'' depends on the controller,
target and disk number of the failed disk. A disk on the same
controller as the failed disk is closer than a disk on a different
controller; and a disk under the same target as the failed disk is
closer than one under a different target.
If no hot spare disk can be found, the following mail is sent:
No hot spare could be found for disk medianame in
diskgroup. No replacement has been made and the disk is still
unusable.
The mail then explains the disposition of volumes that had storage on
the failed disk. The following message lists disks that had storage on
the failed disk, but are still usable:
The following volumes have storage on medianame:
volumename
These volumes are still usable, but the redundancy of
those volumes is reduced. Any RAID-5 volumes with storage
on the failed disk may become unusable in the face of further
failures.
If any non-RAID-5 volumes were made unusable due to the failure of the
disk, the following message is included:
The following volumes:
volumename
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1 Jun 2002
have data on medianame but have no other usable
mirrors on other disks. These volumes are now unusable
and the data on them is unavailable.
If any RAID-5 volumes were made unavailable due to the disk failure,
the following message is included
The following RAID-5 volumes:
volumename
had storage on medianame and have experienced
other failures. These RAID-5 volumes are now unusable
and data on them is unavailable.
If a hot-spare disk was found, a hot-spare replacement is attempted.
This involves associating the device marked as a hot spare with the
media record that was associated with the failed disk. If this is
successful, the vxrecover(1M) command is used in the background to
recover the contents of any data in volumes that had storage on the
disk.
If the hot-spare replacement fails, the following message is sent:
Replacement of disk medianame in group diskgroup
failed. The error is:
error message
If any volumes (RAID-5 or otherwise) are rendered unusable due to the
failure, the following message is included:
The following volumes:
volumename
occupy space on the failed disk and have no other available
mirrors or have experienced other failures. These volumes are
unusable, and the data they contain is unavailable.
If the hot-spare replacement procedure completed successfully and
recovery is under way, a final mail message is sent:
Replacement of disk medianame in group diskgroup
with disk device sparedevice has successfully completed
and recovery is under way.
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If any non-RAID-5 volumes were rendered unusable by the failure
despite the successful hot-spare procedure, the following message is
included in the mail:
The following volumes:
volumename
occupy spare on the replaced disk, but have no other enabled
mirrors on other disks from which to perform recovery. These
volumes must have their data restored.
If any RAID-5 volumes were rendered unusable by the failure despite
the successful hot-spare procedure, the following message is included
in the mail:
The following RAID-5 volumes:
volumename
have subdisks on the replaced disk and have experienced
other failures that prevent recovery. These RAID-5 volumes
must have their data restored.
If any volumes (RAID-5 or otherwise) were rendered unusable, the
following message is also included:
To restore the contents of any volumes listed above, the
volume should be started with the command:
vxvol -f start volumename
and the data restored from backup.
Sparelist File [Toc] [Back]
The sparelist file is a text file that specifies an ordered list of
disks to be used as hot spares when a specific disk fails. The
system-wide sparelist file is located in /etc/vx/sparelist. Each line
in the sparelist file specifies a list of spares for one disk. Lines
beginning with the pound (#) character and empty lines are ignored.
The format for a line in the sparelist file is:
[ diskgroup:] diskname : spare1 [ spare2 ... ]
The diskgroup field, if present, specifies the disk group within which
the disk and designated spares reside. If not present, rootdg is
presumed. The diskname specifies the disk for which spares are being
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designated. The spare list after the colon lists the disks to be used
as hot spares. The list is order dependent; in case of failure of
diskname, the spares are tried in order. A spare will be used only if
it is a valid hot spare (see above). If the list is exhausted without
finding any spares, the default policy of using the closest disk is
used.
FILES [Toc] [Back]
/etc/vx/sparelist Specifies a list of disks to serve as
hot spares for a disk.
NOTES [Toc] [Back]
The sparelist file is not checked in any way for correctness until a
disk failure occurs. It is possible to inadvertently specify a nonexistent
disk or inappropriate disk or disk group. Malformed lines are
also ignored.
SEE ALSO [Toc] [Back]
mailx(1), vxintro(1M), vxnotify(1M), vxrecover(1M), vxrelocd(1M),
vxunreloc(1M)
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