HasturRaidUpgradePath

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title: HasturRaidUpgradePath
---

Upgrade plan for Hastur hardware.

See also: [HasturRaidArray][1]

# 3TB

Original configuration of 6 x 500GB disks in RAID5.

Usable capacity: 2.4TB = (6 * 0.5TB) * ((5-1)/5)

# 8TB

[Hastur Raid Upgrade][3] to 4x 2TB disks in RAID6.

Usable capacity: 4.0TB = (4 * 2TB) * ((4-2)/4)

# Backup

2x 2TB disks added as backups (1 on-site, 1 off-site) in RAID1.

Added no extra capacity.

# 14TB

[HasturRaidUpgrade2][6]

Added 2x 3TB disks. 1 as off-site backup.

## Substitute Strategy

*   Add one 3TB disk to array. Capacity += 2TB.

## Backup Replacement Strategy

*   Add previous 2TB backup disk to array. Capacity += 2TB. 
*   Use new 3TB disk as on-site backup.

## Upgrade Paths

From 2222[4],2 (current) to

*   -> 22222[6],3 (keep one 3TB as backup, give Cos the other) 
*   -> 222233[8],2 ( 
*   -> 222223[8],3 
*   -> (22)(22)44[8] -> (22)4444[12]

# 18TB

[HasturRaidUpgrade3][7]

*   Add 2x 3TB disks, move remaining 2TB disk to backup duty 
*   -> 333333[12], 2 
*   Hopefully sufficient for the next 3 years.

## Upgrade Paths

Replace 2x 3TB with 2x 6TB

*   -> (33)(33)66[12],33 
*   -> raid10?: (3|3)(3|3)(3|3)(3|3)[12]

# 36TB

CyclopsRaidUpgrade1

*   Add 4x 6TB disks 
*   -> 666666[24]

[1]: HasturRaidArray
 [3]: HasturRaidUpgrade
 [6]: HasturRaidUpgrade2
 [7]: HasturRaidUpgrade3

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