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New options to 'lvchange' allow users to scrub their RAID LVs.
Synopsis:
lvchange --syncaction {check|repair} vg/raid_lv
RAID scrubbing is the process of reading all the data and parity blocks in
an array and checking to see whether they are coherent. 'lvchange' can
now initaite the two scrubbing operations: "check" and "repair". "check"
will go over the array and recored the number of discrepancies but not
repair them. "repair" will correct the discrepancies as it finds them.
'lvchange --syncaction repair vg/raid_lv' is not to be confused with
'lvconvert --repair vg/raid_lv'. The former initiates a background
synchronization operation on the array, while the latter is designed to
repair/replace failed devices in a mirror or RAID logical volume.
Additional reporting has been added for 'lvs' to support the new
operations. Two new printable fields (which are not printed by
default) have been added: "syncaction" and "mismatches". These
can be accessed using the '-o' option to 'lvs', like:
lvs -o +syncaction,mismatches vg/lv
"syncaction" will print the current synchronization operation that the
RAID volume is performing. It can be one of the following:
- idle: All sync operations complete (doing nothing)
- resync: Initializing an array or recovering after a machine failure
- recover: Replacing a device in the array
- check: Looking for array inconsistencies
- repair: Looking for and repairing inconsistencies
The "mismatches" field with print the number of descrepancies found during
a check or repair operation.
The 'Cpy%Sync' field already available to 'lvs' will print the progress
of any of the above syncactions, including check and repair.
Finally, the lv_attr field has changed to accomadate the scrubbing operations
as well. The role of the 'p'artial character in the lv_attr report field
as expanded. "Partial" is really an indicator for the health of a
logical volume and it makes sense to extend this include other health
indicators as well, specifically:
'm'ismatches: Indicates that there are discrepancies in a RAID
LV. This character is shown after a scrubbing
operation has detected that portions of the RAID
are not coherent.
'r'efresh : Indicates that a device in a RAID array has suffered
a failure and the kernel regards it as failed -
even though LVM can read the device label and
considers the device to be ok. The LV should be
'r'efreshed to notify the kernel that the device is
now available, or the device should be 'r'eplaced
if it is suspected of failing.
93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2012 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LVM_DEV_MANAGER_H
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#define _LVM_DEV_MANAGER_H
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#include "metadata-exported.h"
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struct logical_volume;
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struct lv_activate_opts;
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struct volume_group;
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struct cmd_context;
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struct dev_manager;
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struct dm_info;
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struct device;
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int read_only_lv(struct logical_volume *lv, struct lv_activate_opts *laopts);
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/*
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* Constructor and destructor.
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*/
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struct dev_manager *dev_manager_create(struct cmd_context *cmd,
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const char *vg_name,
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unsigned track_pvmove_deps);
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void dev_manager_destroy(struct dev_manager *dm);
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void dev_manager_release(void);
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void dev_manager_exit(void);
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/*
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* The device handler is responsible for creating all the layered
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* dm devices, and ensuring that all constraints are maintained
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* (eg, an origin is created before its snapshot, but is not
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* unsuspended until the snapshot is also created.)
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*/
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int dev_manager_info(struct dm_pool *mem, const struct logical_volume *lv,
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const char *layer,
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int with_open_count, int with_read_ahead,
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struct dm_info *info, uint32_t *read_ahead);
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int dev_manager_snapshot_percent(struct dev_manager *dm,
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const struct logical_volume *lv,
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percent_t *percent);
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int dev_manager_mirror_percent(struct dev_manager *dm,
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const struct logical_volume *lv, int wait,
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percent_t *percent, uint32_t *event_nr);
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int dev_manager_raid_status(struct dev_manager *dm,
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const struct logical_volume *lv,
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struct dm_status_raid **status);
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int dev_manager_raid_message(struct dev_manager *dm,
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const struct logical_volume *lv,
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const char *msg);
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int dev_manager_thin_pool_status(struct dev_manager *dm,
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const struct logical_volume *lv,
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struct dm_status_thin_pool **status,
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int noflush);
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int dev_manager_thin_pool_percent(struct dev_manager *dm,
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const struct logical_volume *lv,
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int metadata, percent_t *percent);
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int dev_manager_thin_percent(struct dev_manager *dm,
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const struct logical_volume *lv,
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int mapped, percent_t *percent);
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int dev_manager_suspend(struct dev_manager *dm, struct logical_volume *lv,
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struct lv_activate_opts *laopts, int lockfs, int flush_required);
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int dev_manager_activate(struct dev_manager *dm, struct logical_volume *lv,
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struct lv_activate_opts *laopts);
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int dev_manager_preload(struct dev_manager *dm, struct logical_volume *lv,
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struct lv_activate_opts *laopts, int *flush_required);
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int dev_manager_deactivate(struct dev_manager *dm, struct logical_volume *lv);
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int dev_manager_transient(struct dev_manager *dm, struct logical_volume *lv) __attribute__((nonnull(1, 2)));
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int dev_manager_mknodes(const struct logical_volume *lv);
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/*
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* Put the desired changes into effect.
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*/
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int dev_manager_execute(struct dev_manager *dm);
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int dev_manager_device_uses_vg(struct device *dev,
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struct volume_group *vg);
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#endif
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