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Sunday would have a dump level of 0, followed by Monday, Tuesday, Wednesday, Thursday, and Friday with dump levels of 5, 6, 7, 8, and 9, respectively. To signal the end of a backup cycle, Saturday then has a lower dump level than Monday, which could be 1, 2, 3, or 4. Prior to beginning a ufsdump, it is often useful to estimate the size of a dump to determine how many storage tapes will be required. This estimate can be obtained by dividing the size of the partition by the capacity of the tape. For example, to determine how many tapes would be required to back up the /dev/rdsk/c0t0d0s4 file system, use this:
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# ufsdump S /dev/rdsk/c0t0d0s4 50765536
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The approximately 49MB on the drive will therefore easily fit onto a QIC, DAT, or DLT tape. To perform a full dump of an x86 partition (/dev/rdsk/c0d0s0) at Level 0, you can use the following approach:
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# ufsdump 0cu /dev/rmt/0 /dev/rdsk/c0d0s0 DUMP: Writing 63 Kilobyte records DUMP: Date of this level 0 dump: Mon Feb 03 13:26:33 1997 DUMP: Date of last level 0 dump: the epoch DUMP: Dumping /dev/rdsk/c0d0s0 (solaris:/) to /dev/rmt/0. DUMP: Mapping (Pass I) [regular files] DUMP: Mapping (Pass II) [directories] DUMP: Estimated 46998 blocks (22.95MB). DUMP: Dumping (Pass III) [directories] DUMP: Dumping (Pass IV) [regular files] DUMP: 46996 blocks (22.95MB) on 1 volume at 1167 KB/sec DUMP: DUMP IS DONE DUMP: Level 0 dump on Mon Feb 03 13:26:33 1997
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The parameters passed to ufsdump include 0 (dump level), c (cartridge: blocking factor 126), and u (updates the dump record /etc/dumpdates). The dump record is used by ufsdump and ufsrestore to track the last dump of each individual file system:
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# cat /etc/dumpdates /dev/rdsk/c0t0d0s0 /dev/md/rdsk/d0 /dev/md/rdsk/d2 /dev/md/rdsk/d3 /dev/rdsk/c0t0d0s3 /dev/md/rdsk/d1 /dev/rdsk/c0t0d0s4 /dev/rdsk/c2t3d0s2 /dev/rdsk/c0t2d0s3 /dev/rdsk/c1t1d0s0
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Part IV:
Managing Devices
/dev/rdsk/c0t0d0s0 /dev/rdsk/c0t0d0s3
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ufsdump is flexible because it can be used in conjunction with rsh (remote-shell) and remote access authorization files (.rhosts and /etc/hosts.equiv) to log on remotely to another server and dump the files to one of the remote server s backup devices. However, the problem with this approach is that using .rhosts leaves the host system vulnerable to attack: if an intruder gains access to the client, he can remotely log onto a remote backup server without a username and password. The severity of the issue is compounded by the fact that a backup server that serves many clients has access to most of those clients information in the form of tape archives. Thus, a concerted attack on a single client, leading to an unchallenged remote logon to a backup server, can greatly expose an organization s data. The problems associated with remote access and authorization are covered in depth in 16; however, a secure shell (SSH) tool can be used to overcome the need to use the remote commands. By combining ssh and ufsdump, you can create a full dump of a file system from a client, transfer it securely to the backup server, and then copy it to the backup server s remote devices:
# ufsdump 0f - / | ssh server "dd of=/dev/rmt/0 bs=24b conv=sync"
A handy trick often used by administrators is to use ufsdump to move directories across file systems. A ufsdump is taken of a particular file system, which is then piped through ufsrestore to a different destination directory. For example, to move existing staff files to a larger file system, use these commands:
# mkdir /newstaff # cd /staff # ufsdump 0f - /dev/rdsk/c0t0d0s2 | (cd /newstaff; ufsrestore xf -)
Users of ufsdump should be aware of the buffer overflow vulnerability that exists in some versions of ufsdump supplied with Solaris 2.6 and Solaris 7. This vulnerability permits rogue local users to obtain root access under some conditions. A patch is available from SunSolve (http://sunsolve.sun.com/), and a full explanation of the problem can be found at the SecurityFocus Web site, http://www.securityfocus.com/bid/680. After backing up data using ufsdump, it easy to restore the same data using the ufsrestore program. To extract data from a tape volume on /dev/rmt/0, use this command:
# ufsrestore xf /dev/rmt/0 You have not read any volumes yet. Unless you know which volume your file(s) are on you should start with the last volume and work towards the first. Specify next volume #: 1 set owner/mode for '.' [yn] y
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