Презентация ASN and deduplication training онлайн
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Слайды и текст к этой презентации:
№3 слайд
![Vault without deduplication](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img2.jpg)
Содержание слайда: Vault without deduplication
Storage
TIB files format is the same as on unmanaged vault.
TIBs are stored by special path, which contains machine ID, user ID, archive ID, etc:
/computers/MMSCurrentMachineID.InstanceID/users/SID_OF_USER(from windows)/archives/ArchiveID/
Each chain, started by FULL stored in separate folder, called “stream” in folders named “1”,”2”. In “1_data” dedup data is stored.
Vault could be located on
ASN local folder
Network share
NAS
SAN
№6 слайд
![Deduplicated vault](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img5.jpg)
Содержание слайда: Deduplicated vault
Recommendations:
Put Index (dedup) database on separate storage.
Exclude all paths for vault from antivirus scan.
Have only one dedup vault on single ASN (It’d share RAM).
Parts of deduplicated vault:
Backup storage (local folder, net share, NAS, SAN)
Datastore, LDS, (L)IND, LOC files (stored inside along with vault - Backup storage)
Dedup DB (storing on network share is not supported)
Catalog (local folder recommended)
Vault meta-info DB (Firebird DB stored inside ProgramData)
№7 слайд
![Backup streams connections](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img6.jpg)
Содержание слайда: Backup
2 streams (connections):
Header/metadata/links are stored in TIB file
Actual data Blocks are stored in LDS file,then it is indexed into unified_data
Deduplication at source – only new blocks are sent
Connectivity limits (may be changed)
Simultaneous backup (Client Connection Limit) – 10
Connections to wait in queue (Backup Queue Limit) – 50
Encrypted backups (by agent) are skipped for deduplication
№11 слайд
![Datastore Datastore stores](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img10.jpg)
Содержание слайда: Datastore
Datastore stores blocks
Single datastore for all backup kinds
Blocks are stored in two datastore files (unified_data):
Active – during indexing data is written there
Passive – during compacting unique blocks moved to active
Datastore:
Is transactional (rollback on failure/crash)
Is always compressed
Could be encrypted (encrypted vault)
For 1 TB of unique Disk Backup data we need 3 Gb of RAM
If data is mixed: File, Disk, Exchange, then dedup DB will be growing much faster and much more RAM for 1 TB will be needed.
№12 слайд
![Block size Block size Image](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img11.jpg)
Содержание слайда: Block size
Block size
Image backups: 4 Kb
File backups: 1b – 256Kb
Blocks are compared by fingerprint (block MD5 hash).
Blocks content is stored in Datastore.
Offsets and sizes of blocks are stored in Dedup DB.
Partitions with block less than 4 Kb or not multiple of 4Kb are skipped for deduplication.
№14 слайд
![Deduplication Database Dedup](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img13.jpg)
Содержание слайда: Deduplication Database
Dedup DB is required for fast blocks access by fingerprints.
It stores HASH of block and its offset it datastore.
RAM is used mostly for LOCALITY index
80% of free physical memory used by default.
RAM is locked by ASN even if locality is small
Adjustable -DatastoreIndexCacheMemoryPercent
More than 1 dedup vault on the same machine can be a problem.
№15 слайд
![Deduplication Database Index](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img14.jpg)
Содержание слайда: Deduplication Database
Index is rebuilt after compacting. Rebuilding of index works fast (with disk reading speed).
On every ASN load the whole LOCALITY file is read. That takes time. Vault will be showing “Not ready for use”.
About 1/3 of LOCALITY is loaded into RAM.
If there is not enough RAM, everything will work except Indexing. It will fail asking for RAM. There is no performance degradation with Dedup DB growth.
№19 слайд
![Validation Validation of](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img18.jpg)
Содержание слайда: Validation
Validation of backups/archives validates only existence of hashes in Dedup DB (on disk and file archives at least)
Validation of “Vault” validates all archives and then datastore.
Theoretically there is a chance that info in dedup DB does not match datastore. In this case validaton of vault succeeds but recovery of backups fail. In this case escalate.
№20 слайд
![Attach detach Detach Vault](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img19.jpg)
Содержание слайда: Attach / detach
Detach
Vault meta-info db (.fdb) is copied to vault (storage) location.
Attach
During attach it’s recommended to copy Index and Catalog from last location
Storage path (it is obligatory)
Index (deduplication) db path
Catalog path
If Index or Catalog paths contain no Index – it will be recreated. Recreation of index is going to be done with disk writing speed.
After attach/detach ASN syncs with AMS. So the vault appears/disappears from AMS with a delay.
№23 слайд
![Vault meta structure Vault](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img22.jpg)
Содержание слайда: Vault meta structure
Vault meta files are located in: \BackupAndRecovery\ASN\.meta
1 file per vault. There is also 1 file with a list of vaults.
<?xml version="1.0" encoding="UTF-8" ?>
<metainfo id="26D7D967-C222-4B8E-927B-F8CF4FE1F410" type="location">
<catalog_database_uri> -- Path to Catalog. You can use it to change catalog path C:\ProgramData\Acronis\BackupAndRecovery\ASN\Catalog\. (should be done on stopped ASN)
</catalog_database_uri>
<database_uri>-- Path to Firebird (.FDB) database. Do not touch.
C:\ProgramData\Acronis\BackupAndRecovery\ASN\VaultMetadataDatabases\
</database_uri>
<description />
<index_database_uri> -- Path to dedup DB
\\\
</index_database_uri>
<location_id> -- Location ID. Must match file name and metainfo id in top.
26D7D967-C222-4B8E-927B-F8CF4FE1F410
</location_id>
<name> -- Vault name
testvlt
</name>
<storage_uri> -- Vault path
F:\mng
</storage_uri>
</metainfo>
These files are found in sysinfo and help to determine if the current vault has dedup enabled, where it is located, etc.
№24 слайд
![Vault meta files Inside of](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img23.jpg)
Содержание слайда: Vault meta files
Inside of the vault there is .meta folder. The folder contains meta for each archive and 1 meta for the vault itself.
Archive meta is similar to XML on unmanaged vault.
Vault meta is similar to the .meta on ASN <?xml version="1.0" encoding="UTF-8" ?>
<metainfo id="92FCE129-B465-4ECA-B6F5-DF4CC3DE1682" type="location"> -Location ID. Must match location ID from .meta on ASN
<admin_ids>
S-1-5-32-544 –SIDs of vault administrators
</admin_ids>
<attached_to>
00000000-0000-0000-0000-000000000000–ASN machine ID. If 000 – then the vault is detached
</attached_to>
<compression_level>
none –compression
</compression_level>
<deduplicated>
1 –1 – deduplicated. 0 – non deduplicated
</deduplicated>
<description />
<location_id>
92FCE129-B465-4ECA-B6F5-DF4CC3DE1682 -Location ID. Must match location ID from .meta on ASN
</location_id>
<location_version>
abr11
</location_version>
<name>
sharevault
</name>
<unified_store_data_size>
14286848 –dedup unified_data_ds size
</unified_store_data_size>
<user_ids>
S-1-1-0 –SIDs of vault users
</user_ids>
</metainfo>
If vault is encrypted it will also have fingreprint of data to ensure if correct key was entered.
№27 слайд
![ASN and Tapes ASN is the](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img26.jpg)
Содержание слайда: ASN and Tapes
ASN is the service that writes to tape.
ARSM is responsible for:
1. Moving tapes.
2. Inventoring tapes.
3. Operations with ARSM.sqlite
Starting from U4 ASN is using ARSM.sqlite as vault database.
4. Delays after backup, before replication starts. Almost Fixed in u6.
№30 слайд
![Vault is corrupted When ASN](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img29.jpg)
Содержание слайда: Vault is corrupted
When ASN says that vault is corrupted check events.db3
.tmp files in .meta in the vault (fixed in u5)
Multiple “location” meta files In .meta in vault.
Vault is on NAS. Access to NAS fails.
Vault is attached but “ASNID” in .meta in vault is different from ASN or is 00000.
Vault is corrupted due to known issues on 43916. Rebackup lost blocks or recreate vault.
№31 слайд
![Storage Node is busy. Usually](/documents_6/175ccfe8e8a65f3f8092e16a45145629/img30.jpg)
Содержание слайда: Storage Node is busy.
Usually a deadlock. Most likely caused not by connection limiter itself.
If it is really a very heavily loaded environment and ASN runs many activities then temporary workaround is to set:
HKLM\SOFTWARE\Acronis\ASN\Configuration\StorageNode\ClientConnectionLimit to 30
HKLM\SOFTWARE\Acronis\ASN\Configuration\StorageNode\FastOperationConnectionLimit to 100
HKLM\SOFTWARE\Acronis\ASN\Configuration\StorageNode\FastOperationQueueLimit to 500
HKLM\SOFTWARE\Acronis\ASN\Configuration\StorageNode\BackupQueueLimit to 150
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