[myTouch 4G Q&A, Help & Troubleshooting] urmothersluvr:
I booted into recovery to backup my rom and I seen some errors but I ignored it. I tried to back up and it gives me a error can't mount cache. Here is the log from cwm.

Starting recovery on Sat Dec 17 17:43:32 2011

can't open /dev/tty0: No such file or directory

framebuffer: fd 3 (480 x 800)

ClockworkMod Recovery v5.0.2.0

recovery filesystem table

=========================

0 /tmp ramdisk (null) (null)

1 /recovery emmc /dev/block/mmcblk0p21 (null)

2 /boot emmc /dev/block/mmcblk0p22 (null)

3 /cache ext3 /dev/block/mmcblk0p27 (null)

4 /data ext3 /dev/block/mmcblk0p26 (null)

5 /sdcard vfat /dev/block/mmcblk1p1 /dev/block/mmcblk1

6 /sd-ext ext3 /dev/block/mmcblk1p2 (null)

7 /system ext3 /dev/block/mmcblk0p25 (null)

I:Completed outputting fstab.

I:Processing arguments.

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

E:Can't mount /cache/recovery/command

I:Checking arguments.

I:device_recovery_start()

Command: "/sbin/recovery"

ro.secure=0

ro.allow.mock.location=1

ro.debuggable=1

persist.service.adb.enable=1

ro.build.id=GRJ22

ro.build.display.id=GRJ90

ro.build.version.incremental=eng.koush.20110905.105318

ro.build.version.sdk=10

ro.build.version.codename=REL

ro.build.version.release=2.3.5

ro.build.date=Mon Sep 5 10:53:41 PDT 2011

ro.build.date.utc=0

ro.build.type=eng

ro.build.user=koush

ro.build.host=Koushik-Lion.local

ro.build.tags=test-keys

ro.product.model=HTC Glacier

ro.product.brand=tmobile

ro.product.name=htc_glacier

ro.product.device=glacier

ro.product.board=glacier

ro.product.cpu.abi=armeabi-v7a

ro.product.cpu.abi2=armeabi

ro.product.manufacturer=HTC

ro.product.locale.language=hdpi

ro.product.locale.region=

ro.wifi.channels=

ro.board.platform=msm7x30

ro.build.product=glacier

ro.build.description=2.19.531.1 CL95282 release-keys

ro.build.fingerprint=tmobile/htc_glacier/glacier:2.3.4/GRJ22/95282:user/release-keys

ro.sf.lcd_density=240

debug.fb.rgb565=0

ro.gsm.2nd_data_retry_config=max_retries=3, 2000, 2000, 2000

rild.libpath=/system/lib/librilswitch.so

rilswitch.vendorlibpath=/system/lib/libhtc_ril.so

rilswitch.ganlibpath=/system/lib/libganril.so

ro.ril.enable.a53=1

ro.ril.enable.dtm=1

ro.ril.gprsclass=12

ro.ril.hsdpa.category=10

ro.ril.hsupa.category=6

ro.ril.hsxpa=2

ro.ril.def.agps.mode=2

ro.ril.def.agps.feature=1

ro.ril.disable.fd.plmn.prefix=23402,23410,23411

ro.ril.enable.sdr=0

ro.ril.enable.gea3=0

net.tcp.buffersize.hsdpa=4094,87380,393216,4096,16384,110208

net.change=net.bt.name

ro.telephony.default_network=0

wifi.interface=eth0

wifi.supplicant_scan_interval=15

mobiledata.interfaces=gannet0,rmnet0,rmnet1,rmnet2

ro.opengles.version=131072

dalvik.vm.heapsize=32m

ro.ril.disable.power.collapse=1

ro.com.google.clientidbase=android-tmobile-us

ro.com.google.clientidbase.vs=android-hms-tmobile-us

ro.com.google.clientidbase.ms=android-hms-tmobile-us

ro.com.google.locationfeatures=1

ro.com.google.networklocation=1

ro.com.google.gmsversion=2.2_r6

ro.setupwizard.enable_bypass=1

dalvik.vm.lockprof.threshold=500

dalvik.vm.dexopt-flags=m=y

media.a1026.nsForVoiceRec=0

media.a1026.enableA1026=1

htc.audio.alt.enable=0

htc.audio.hac.enable=0

keyguard.no_require_sim=true

ro.rommanager.developerid=cyanogenmod

ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html

ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html

ro.com.android.wifi-watchlist=GoogleGuest

ro.setupwizard.enterprise_mode=1

ro.com.android.dateformat=MM-dd-yyyy

ro.com.android.dataroaming=false

ro.config.ringtone=Playa.ogg

ro.config.notification_sound=regulus.ogg

ro.config.alarm_alert=Alarm_Beep_03.ogg

ro.modversion=CyanogenMod-7.1.0-RC1-glacier-KANG

ro.kernel.android.checkjni=1

ro.setupwizard.mode=OPTIONAL

net.bt.name=Android

dalvik.vm.stack-trace-file=/data/anr/traces.txt

ro.factorytest=0

ro.serialno=SH119RM05983

ro.bootmode=recovery

ro.baseband=26.13.04.19_M

ro.carrier=TMUS

ro.bootloader=0.85.2007

ro.hardware=glacier

ro.revision=128

init.svc.choice_fn=stopped

init.svc.htcbatt=stopped

init.svc.adbd=running

ro.9kramdump=0

init.svc.recovery=running

I:Checking for extendedcommand...

I:Skipping execution of extendedcommand, file not found...

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

E:Can't mount /cache/recovery/log

E:Can't open /cache/recovery/log

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

E:Can't mount /cache/recovery/last_log

E:Can't open /cache/recovery/last_log

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

W:failed to mount /dev/block/mmcblk0p27 (Invalid argument)

W:Can't unlink /cache/recovery/command

I am still able to use my phone but I'm on ics beta 4.1 I don't wanna do something to my phone that makes it not usable because it is my only T-Mobile phone. Any help?