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Chapter 24. Storage
e2fsprogs
component- The
e4defrag
utility in the e2fsprogs package is not supported in Red Hat Enterprise Linux 7.0, and is scheduled to be removed in Red Hat Enterprise Linux 7.1. xfsprogs
component- If XFS metadata checksums are enabled specifying the
-m crc=1
option to themkfs.xfs
command, the kernel prints the following warning message when the file system is mounted:Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled! Use of these features in this kernel is at your own risk!
Note that this CRC functionality is available for testing in Red Hat Enterprise Linux 7.0 and is planned to be fully supported in Red Hat Enterprise Linux 7.1. cryptsetup
component, BZ#883941- When the
systemd
daemon parses the crypttab file in case of a non-LUKS device for swap with a random key, it uses theripemd160
hash by default, which is not allowed in FIPS mode. To work around this problem, add thehash=
setting with an algorithm approved for FIPS to the particular crypttab line. For example:swap /dev/sda7 /dev/urandom swap,hash=sha1
. lvm2
component, BZ#1083633- If the kernel thin provisioning code detects a device failure or runs out of metadata space, it sets a flag on the device to indicate that it needs to be checked. Currently, LVM tools do not perform this check automatically. To work around this problem, execute the
thin_check --clear-needs-check-flag
command to perform the check and remove the flag. Then run thethin_repair
command if necessary. Alternatively, you can add--clear-needs-check-flag
tothin_check_options
in the global section of the/etc/lvm.conf
configuration file to run the check automatically. device-mapper-multipath
component, BZ#1066264- In Red Hat Enterprise Linux 7, the behavior of the
kpartx
utility has been changed, so it no longer adds the letterp
as a delimiter between a device name and a partition suffix unless the device name ends with a digit. When a device is renamed using themultipath
utility, the previous device name is simply replaced by a new name while the suffix stays unchanged, regardless of the delimiter. Consequently, thekpartx
behavior is not followed, and changing device names ending in a digit to names ending in a letter, or the other way round, works incorrectly when usingmultipath
to rename devices. To work around this problem, choose one of the following three options:- Remove the
multipathd
daemon and add the devices again; - Remove the devices manually by using the
kpartx -d
command and then add them by running thepartx -a
command; - Rename the devices by using the
kpartx -p p
command for device names that are supposed to contain the delimiter and they do not, and thekpartx -p ""
command in cases when the delimiter is used redundantly.
snapper
component, BZ#1071973- The
empty-pre-post
cleanup algorithm, which is used for deleting pre-post pairs of file system snapshots with empty diffs, does not work in Red Hat Enterprise Linux 7. To work around this problem, remove empty pre-post snapshot couples manually by using thedelete
command. kernel
component, BZ#1084859- The bigalloc feature for the
ext4
file systems, which enablesext4
to use clustered allocation, is not supported in Red Hat Enterprise Linux 7. lvm2
component, BZ#1083835- Placing the
/boot
partition on an LVM volume is not supported. Placing the/boot
partition on a Btrfs subvolume is not supported either. nfs-utils
component, BZ#1082746- While the rpc.svcgssd binary is included in the nfs-utils package in Red Hat Enterprise Linux 7.0, its use in new deployments is discouraged in favor of gssproxy. The rpc.svcgssd binary may be removed in later Red Hat Enterprise Linux 7 releases.
kernel
component, BZ#1061871, BZ#1201247- When a storage array returns a CHECK CONDITION status but the sense data is invalid, the Small Computer Systems Interface (SCSI) mid-layer code retries the I/O operation. If subsequent I/O operations receive the same result, I/O operations are retried indefinitely. For this bug, no workaround is currently available.